This document discusses GSM-GPRS antenna operation and related equipment. It covers various antenna types including omnidirectional and directional antennas. It describes key antenna properties such as gain, polarization, beamwidth, downtilt, front-to-back ratio and intermodulation. It also discusses antenna development trends and network elements like masthead amplifiers and boosters. The document provides an overview of important concepts regarding antennas and equipment used for GSM-GPRS networks.
The document summarizes the key components of a CDMA antenna and feeder system. The system comprises antennas, antenna jumpers, main feeders, lightning arresters, cabinet-top jumpers, and grounding parts. Antennas have electrical properties like frequency range, impedance, VSWR, polarization, and gain. They also have mechanical properties like dimensions, weight, operating temperature range, and lightning protection. Common antenna types include directional and omnidirectional antennas. The main feeder connects the antenna to other components and has specifications for material, maximum frequency, impedance, and bending radius. A GPS antenna feeder system is also included to capture clock signals for CDMA use.
Mobile communications is one of the communications fields that develop rapidly and energetically. The antenna builds the bridge between user terminals and base control devices. It is widely used in the mobile communications and the wireless access communication system. The rapid development of the antenna greatly promotes its technology innovation.
It is important to deeply grasp the knowledge of the antenna, which is useful to:
Install and maintain products.
Promote the network planning.
Chapter 1 Working Principle
Chapter 2 Classification
Chapter 3 Electrical Index
Chapter 4 Mechanical Index
When the conducting cable carries the alternating current, the electromagnetic wave radiation can be formed.
If two conducting cables are close, the directions of their current are opposite, and the electromotive force is counteracted. Thus the radiation becomes week.
If two conducting cables are open, the directions of their current are the same. Thus the radiation becomes strong.
When the length of the conducting cable is like the wavelength, the current on the cable will be enhanced. Thus the radiation becomes strong.
The straight conducting cable which can generate the strong radiation is called the dipole.
The pole whose two arms are of the same length (1/4 Wavelength) is called as dipole or half-wave-length dipole.
This document provides an overview of antennas and their functions. It defines an antenna as a passive conductor that radiates or receives electromagnetic waves without amplifying energy. It describes how antennas radiate via time-varying electric and magnetic fields that create electromagnetic waves. Key antenna performance parameters are explained such as radiation pattern, beamwidth, gain, directivity, polarization, effective radiated power, and front-to-back ratio. Common antenna types like omni-directional, semi-directional, and highly-directional are characterized. The document also covers antenna tuning techniques including downtilt and discusses smart antennas and their advantages over traditional antennas.
Tech Vidhya is the premier IT and Telecom training institute of India that is running its quality training courses since last decade and we deliver what we promise. Tech Vidhya is the leading training institute in telecom and IT sector that offers various Telecom, telecommunication, Networking and IT/Software courses in an efficient and friendly manner. We are having the highly qualified and experienced trainers for all the courses. The trainers are updated with the latest technologies and they are working on various live projects on India’s top telecom/IT companies.
This document presents the design of a phased array antenna system using phase shifters. A group of 4 students designed and simulated a 1x4 microstrip patch antenna array fed by a Wilkinson power divider in ADS software. They first designed a single rectangular patch antenna, then a 1:4 Wilkinson power divider and combined them into an antenna array. Phase shifters using varactor diodes were also designed and simulated for different voltage biases. The phase and insertion loss characteristics of the phase shifters were analyzed to verify their performance in the phased array system.
This thesis focuses on mobile phones antenna design with brief description about the historical development, basic parameters and the types of antennas which are used in mobile phones. Mobile phones antenna design section consists of two proposed PIFA antennas. The first design concerns a single band antenna with resonant frequency at GPS frequency (1.575GHz). The first model is designed with main consideration that is to have the lower possible PIFA single band dimensions with reasonable return loss (S11) and the efficiencies. Second design concerns in a wideband PIFA antenna which cover the range from 1800MHz to 2600MHz. This range covers certain important bands: GSM (1800MHz & 1900MHz), UMTS (2100MHz), Bluetooth & Wi-Fi (2.4GHz) and LTE system (2.3GHz, 2.5GHz, and 2.6GHz). The wideband PIFA design is achieved by using slotted ground plane technique. The simulations for both models are performed in COMSOL Multiphysics.
The last two parts of the thesis present the problems of mobile phones antenna. Starting with Specific absorption rate (SAR) problem, efficiency of Mobile phones antenna, and hand-held environment.
Electrical properties
Operation Frequency Band
Input impedance
VSWR
Polarization
Gain
Radiation Pattern
Horizontal/Vertical beamwidth
Downtilt
Front/back ratio
Sidelobe suppression and null filling
Power capability
3rd order Intermodulation
Insulation
Mechanical properties
Size
Weight
Radome material
Appearance and color
Working temperature
Storage termperature
Windload
Connector types
Package Size
Lightening
This document provides instructions for installing BTS equipment both indoors and outdoors. It discusses installing indoor cable trays and grounding bars, as well as outdoor equipment like antennas, feeder cables, and jumpers. Key steps include properly grounding all equipment, routing cables to avoid sharp bends, taking safety precautions during installation, and ensuring tight connections between components. The goal is to setup the BTS site according to specifications while grounding and weatherproofing equipment for optimal performance and protection.
The document summarizes the key components of a CDMA antenna and feeder system. The system comprises antennas, antenna jumpers, main feeders, lightning arresters, cabinet-top jumpers, and grounding parts. Antennas have electrical properties like frequency range, impedance, VSWR, polarization, and gain. They also have mechanical properties like dimensions, weight, operating temperature range, and lightning protection. Common antenna types include directional and omnidirectional antennas. The main feeder connects the antenna to other components and has specifications for material, maximum frequency, impedance, and bending radius. A GPS antenna feeder system is also included to capture clock signals for CDMA use.
Mobile communications is one of the communications fields that develop rapidly and energetically. The antenna builds the bridge between user terminals and base control devices. It is widely used in the mobile communications and the wireless access communication system. The rapid development of the antenna greatly promotes its technology innovation.
It is important to deeply grasp the knowledge of the antenna, which is useful to:
Install and maintain products.
Promote the network planning.
Chapter 1 Working Principle
Chapter 2 Classification
Chapter 3 Electrical Index
Chapter 4 Mechanical Index
When the conducting cable carries the alternating current, the electromagnetic wave radiation can be formed.
If two conducting cables are close, the directions of their current are opposite, and the electromotive force is counteracted. Thus the radiation becomes week.
If two conducting cables are open, the directions of their current are the same. Thus the radiation becomes strong.
When the length of the conducting cable is like the wavelength, the current on the cable will be enhanced. Thus the radiation becomes strong.
The straight conducting cable which can generate the strong radiation is called the dipole.
The pole whose two arms are of the same length (1/4 Wavelength) is called as dipole or half-wave-length dipole.
This document provides an overview of antennas and their functions. It defines an antenna as a passive conductor that radiates or receives electromagnetic waves without amplifying energy. It describes how antennas radiate via time-varying electric and magnetic fields that create electromagnetic waves. Key antenna performance parameters are explained such as radiation pattern, beamwidth, gain, directivity, polarization, effective radiated power, and front-to-back ratio. Common antenna types like omni-directional, semi-directional, and highly-directional are characterized. The document also covers antenna tuning techniques including downtilt and discusses smart antennas and their advantages over traditional antennas.
Tech Vidhya is the premier IT and Telecom training institute of India that is running its quality training courses since last decade and we deliver what we promise. Tech Vidhya is the leading training institute in telecom and IT sector that offers various Telecom, telecommunication, Networking and IT/Software courses in an efficient and friendly manner. We are having the highly qualified and experienced trainers for all the courses. The trainers are updated with the latest technologies and they are working on various live projects on India’s top telecom/IT companies.
This document presents the design of a phased array antenna system using phase shifters. A group of 4 students designed and simulated a 1x4 microstrip patch antenna array fed by a Wilkinson power divider in ADS software. They first designed a single rectangular patch antenna, then a 1:4 Wilkinson power divider and combined them into an antenna array. Phase shifters using varactor diodes were also designed and simulated for different voltage biases. The phase and insertion loss characteristics of the phase shifters were analyzed to verify their performance in the phased array system.
This thesis focuses on mobile phones antenna design with brief description about the historical development, basic parameters and the types of antennas which are used in mobile phones. Mobile phones antenna design section consists of two proposed PIFA antennas. The first design concerns a single band antenna with resonant frequency at GPS frequency (1.575GHz). The first model is designed with main consideration that is to have the lower possible PIFA single band dimensions with reasonable return loss (S11) and the efficiencies. Second design concerns in a wideband PIFA antenna which cover the range from 1800MHz to 2600MHz. This range covers certain important bands: GSM (1800MHz & 1900MHz), UMTS (2100MHz), Bluetooth & Wi-Fi (2.4GHz) and LTE system (2.3GHz, 2.5GHz, and 2.6GHz). The wideband PIFA design is achieved by using slotted ground plane technique. The simulations for both models are performed in COMSOL Multiphysics.
The last two parts of the thesis present the problems of mobile phones antenna. Starting with Specific absorption rate (SAR) problem, efficiency of Mobile phones antenna, and hand-held environment.
Electrical properties
Operation Frequency Band
Input impedance
VSWR
Polarization
Gain
Radiation Pattern
Horizontal/Vertical beamwidth
Downtilt
Front/back ratio
Sidelobe suppression and null filling
Power capability
3rd order Intermodulation
Insulation
Mechanical properties
Size
Weight
Radome material
Appearance and color
Working temperature
Storage termperature
Windload
Connector types
Package Size
Lightening
This document provides instructions for installing BTS equipment both indoors and outdoors. It discusses installing indoor cable trays and grounding bars, as well as outdoor equipment like antennas, feeder cables, and jumpers. Key steps include properly grounding all equipment, routing cables to avoid sharp bends, taking safety precautions during installation, and ensuring tight connections between components. The goal is to setup the BTS site according to specifications while grounding and weatherproofing equipment for optimal performance and protection.
Antennas: the key to your wireless application Harald Naumann Round SolutionsGoWireless
The document discusses various topics related to embedded monopole antenna design including benefits, drawbacks, tuning, interference issues, ground plane size requirements, and selecting the right antenna partner. Key points include that monopoles have small size but require a reasonably sized ground plane, components nearby can interfere, and working with an expert partner can help minimize risks and tune the antenna design.
The document discusses different types of phase shifters, including ferrite and semiconductor phase shifters. Ferrite phase shifters work by changing the permeability of ferrite material with a magnetic field, thus changing the guided wavelength and phase delay. Semiconductor phase shifters include switched line, loaded line, and switched path designs using PIN diodes or FETs. Digital phase shifters provide precise phase shifts in discrete increments. Phase shifters have applications in communication systems, radar systems, and industrial instrumentation due to their ability to electronically control the phase of RF signals.
Introduction To Antenna Impedance Tuner And Aperture Switchcriterion123
This document discusses antenna tuning techniques for mobile devices. It describes two main antenna tuning methods: impedance tuning and aperture tuning. Impedance tuning optimizes power transfer between the RF front-end and antenna by adding a tunable matching network. Aperture tuning modifies the antenna structure and performance by integrating a switch to change the antenna's electrical length and resonance. The document provides examples of antenna tuners that use these techniques and discusses design considerations like losses to maximize performance.
This document analyzes frequency coordination between UMTS900 and GSM900 systems operating at 900 MHz. It summarizes lab tests conducted on commercial UMTS900 and GSM900 equipment to measure interference levels and assess the impact of mutual interference. The limiting factor is found to be interference from GSM mobile stations to UMTS Node B receivers. With a frequency offset of 2.2 MHz or more, satisfactory system performance can be achieved even when as little as 4.2 MHz of GSM spectrum is cleared for UMTS use.
This document discusses frequency coordination between UMTS and GSM systems operating at 900 MHz. It analyzes the interference between UMTS900 and GSM900 networks that will need to coexist during the transition from GSM to UMTS spectrum. Laboratory tests were conducted using commercial UMTS and GSM equipment to characterize transmitter and receiver performance under interference conditions and determine the required guard band between the networks based on acceptable sensitivity degradation levels. The limiting factor was found to be interference from GSM mobile stations to UMTS base stations, and a guard band of 4.2 MHz would allow satisfactory system performance.
This document discusses carrier aggregation (CA) and the challenges it poses for LTE Advanced user equipment. It describes how CA works by aggregating multiple component carriers to provide bandwidths up to 100MHz. It also discusses the new requirements for cross isolation between transmit and receive bands of at least 50dB. Additionally, it covers various inter-band and intra-band challenges like higher peak-to-average power ratios, increased harmonic distortion, and intermodulation products. Finally, it presents different architectural options for implementing CA including separate antennas, switches, diplexers and multiplexers.
This document provides an overview of basic antenna principles and types used for mobile communications. It discusses the theory behind how antennas work and key definitions such as polarization, radiation pattern, gain and impedance. It also describes different types of antennas used for base stations, vehicles, portable devices and in GSM/DCS networks, including omnidirectional, directional, diversity and indoor antennas. Specific antenna technologies covered include groundplane, skirt, yagi, log-periodic, panel and corner reflector designs.
Challenges In Designing 5 GHz 802.11 ac WIFI Power Amplifierscriterion123
Designing 5 GHz 802.11ac WiFi power amplifiers presents several challenges: (1) meeting the stringent error vector magnitude (EVM) requirement of less than 1.8% due to higher order modulations, (2) ensuring stable performance during dynamic on/off operation while avoiding transients that degrade EVM, and (3) optimizing the power amplifier to achieve both high power-added efficiency and linearity over wide 80/160 MHz bandwidths at 5 GHz frequencies. Addressing these challenges requires careful design of the power amplifier, bias circuits, and matching networks.
The document discusses receiver architecture and design requirements. It covers:
1. The receiver must provide high gain of 100dB while spread across RF, IF, and baseband stages to avoid instability. It must also be sensitive to weak signals down to -110dBm and reject strong adjacent channels.
2. A superheterodyne receiver is most common as it allows for sharper filters at IF to improve selectivity. Downconverting to IF also eases image filtering requirements.
3. Automatic gain control is needed to adjust the receiver gain over a wide range of input signal levels and fit them into the baseband processing range. It helps prevent compression from strong signals exceeding the 1dB compression point.
The document defines an antenna as a metallic device for transmitting and receiving electromagnetic waves between free space and a transmission line. It discusses basic antenna parameters such as radiation resistance, input impedance, polarization, radiation pattern, gain, beamwidth, bandwidth, and efficiency. It also describes common RF connectors and their specifications. Finally, it outlines a test setup using a vector network analyzer to measure antennas and provides formulas for evaluating antennas.
The ABCs of ADCs Understanding How ADC Errors Affect System Performancecriterion123
Dynamic range is an important consideration for digital receivers. A high dynamic range allows a receiver to capture both weak and strong signals. Digital variable gain amplifiers provide gain adjustment to keep signal levels constant at the analog-to-digital converter (ADC) input. Factors like modulation type, noise, distortion, and peak-to-average power ratio determine the required ADC dynamic range. Proper automatic gain control and oversampling can help improve dynamic range performance.
The document describes several receiver designs developed at the Analog and Mixed-Signal Center between 2000-2008, including a Bluetooth receiver, a dual-standard Bluetooth/Wi-Fi receiver ("Chameleon" receiver), and others. It provides details on the system design and individual building blocks for the Bluetooth and Chameleon receivers, such as the low-IF architecture, active complex filter, GFSK demodulator, and time-interleaved pipeline ADC. Experimental results showed the Bluetooth receiver achieved -82dBm sensitivity while the Chameleon receiver achieved -91dBm and -86.5dBm for Bluetooth and Wi-Fi modes respectively.
This document discusses wireless communication network project antenna installation engineering. It provides diagrams and explanations of different types of radio base stations, antenna systems, remote electrical tilt systems, external hybrid combiner units, tower-mounted amplifiers, repeater solutions, smart radio concepts, and in-building solutions. Examples of metro site installations are also included. The document concludes with brief discussions of new generation technologies and problems of technology.
The document discusses Nokia-Siemens Networks, which merged in 2006 and has headquarters in Finland. It provides mobile network services to over 1 billion subscribers through its networks in 150+ countries. The document then describes the base station subsystem (BSS) and its components, including the base transceiver station (BTS), base station controller (BSC), and network switching subsystem (NSS). It provides details on BTS components, transmission units, and tasks performed by the RF team like site surveys, loop breaks, flexi site installations, and intelligent BTS shutdowns.
Microwave technology provides wireless transmission over medium distances using the microwave spectrum. It has advantages over wired systems in areas where cabling is not feasible. Microwaves propagate through free space and can be reflected, refracted, diffracted or scattered. Fading occurs due to multipath reflections and refractions. Fresnel zones must be clear for line of sight transmission. Technologies like space and frequency diversity and adaptive coding and modulation help mitigate fading. Microwave hardware consists of indoor and outdoor units connected by cables. Configurations include split mount, trunk mount and all outdoor. E-band millimeter wave uses higher frequencies for multi-gigabit links over short distances.
1. WCDMA uses BPSK in the uplink and QPSK in the downlink. Pulse shaping uses RRC (Root-Raised-Cosine) to prevent inter-symbol interference caused by group delay variations during wireless transmission.
2. Pulse shaping is introduced to eliminate noise and facilitate demodulation. WCDMA uses the RRC filter, whose time domain shape is the famous Broadcom logo sinc function.
3. LTE uses SC-FDMA in the uplink and OFDMA in the downlink. OFDM more efficiently uses bandwidth and can accommodate more users. Each OFDM sub-carrier is the Broadcom logo sinc function, with all sub-carriers being orthogonal called
With an increasing capacity demand, and a limited frequency spectrum,the operators are forced to utilise the frequency spectrum moreefficiently. High capacity frequency planning techniques are often basedon tight frequency reuse. The networks become interference limited, andin order to maximise the capacity, every available technique to minimiseinterference becomes important.
This document discusses different types of antennas used in mobile devices. It begins by introducing antennas and their roles in transmitting and receiving electromagnetic waves. There are several key parameters discussed for antennas including bandwidth, gain, effective area, radiation pattern, impedance, efficiency, and polarization. The main types of antennas covered are isotropic antennas, which radiate equally in all directions; directional antennas, which radiate more effectively in one direction; and omnidirectional antennas, which radiate in all directions except the azimuth plane. The document focuses on different antenna types used specifically for mobiles, including roof mounted antennas, glass mounted antennas, high gain antennas, and various space diversity antennas oriented horizontally or vertically.
This document discusses the history and types of radio receivers. It describes how the earliest radio receiver was created in 1896 by Alexander Popov and was based on Maxwell's discovery of electromagnetic waves. There are three main types of receivers discussed - crystal radios, tuned radio frequency receivers, and superheterodyne receivers. Crystal radios require no power source beyond the radio waves themselves, while tuned radio frequency receivers have individually tuned amplifier stages and superheterodyne receivers mix signals to extract an intermediate frequency. The document also covers frequency ranges, sensitivity, selectivity and how radio waves propagate.
The AM Receiver and Audio Amplification ProjectAndrew Robson
A Year 1 Media Technology report looking at AM Transmission and Audio amplification.
This written report was submitted as well as an online version which can be found at https://sites.google.com/site/radio2radioproject/home
January 2010
This document provides an overview of network drive testing on 2G/3G networks. It discusses the reasons for performing drive tests, including network performance monitoring, maintenance, benchmarking, and addressing customer complaints. It then outlines the modules to be covered in the training, including an overview of 3G systems, drive test concepts, performing outdoor drive tests, and drive test reporting and analysis. Key topics that will be covered include 3G/UMTS architectures, channelization, handover processes, and the parameters measured during 2G and 3G drive tests.
The document discusses GSM air interface and channel mapping. It introduces GSM frequency bands, channel numbering, physical channels, and logical channels. It explains that logical channels must be mapped to physical channels, with different burst types used for different channel types during transmission. TDMA is used to allocate timeslots on each radio frequency channel for multiple users. Precise synchronization is required for the channel mapping and transmission.
Antennas: the key to your wireless application Harald Naumann Round SolutionsGoWireless
The document discusses various topics related to embedded monopole antenna design including benefits, drawbacks, tuning, interference issues, ground plane size requirements, and selecting the right antenna partner. Key points include that monopoles have small size but require a reasonably sized ground plane, components nearby can interfere, and working with an expert partner can help minimize risks and tune the antenna design.
The document discusses different types of phase shifters, including ferrite and semiconductor phase shifters. Ferrite phase shifters work by changing the permeability of ferrite material with a magnetic field, thus changing the guided wavelength and phase delay. Semiconductor phase shifters include switched line, loaded line, and switched path designs using PIN diodes or FETs. Digital phase shifters provide precise phase shifts in discrete increments. Phase shifters have applications in communication systems, radar systems, and industrial instrumentation due to their ability to electronically control the phase of RF signals.
Introduction To Antenna Impedance Tuner And Aperture Switchcriterion123
This document discusses antenna tuning techniques for mobile devices. It describes two main antenna tuning methods: impedance tuning and aperture tuning. Impedance tuning optimizes power transfer between the RF front-end and antenna by adding a tunable matching network. Aperture tuning modifies the antenna structure and performance by integrating a switch to change the antenna's electrical length and resonance. The document provides examples of antenna tuners that use these techniques and discusses design considerations like losses to maximize performance.
This document analyzes frequency coordination between UMTS900 and GSM900 systems operating at 900 MHz. It summarizes lab tests conducted on commercial UMTS900 and GSM900 equipment to measure interference levels and assess the impact of mutual interference. The limiting factor is found to be interference from GSM mobile stations to UMTS Node B receivers. With a frequency offset of 2.2 MHz or more, satisfactory system performance can be achieved even when as little as 4.2 MHz of GSM spectrum is cleared for UMTS use.
This document discusses frequency coordination between UMTS and GSM systems operating at 900 MHz. It analyzes the interference between UMTS900 and GSM900 networks that will need to coexist during the transition from GSM to UMTS spectrum. Laboratory tests were conducted using commercial UMTS and GSM equipment to characterize transmitter and receiver performance under interference conditions and determine the required guard band between the networks based on acceptable sensitivity degradation levels. The limiting factor was found to be interference from GSM mobile stations to UMTS base stations, and a guard band of 4.2 MHz would allow satisfactory system performance.
This document discusses carrier aggregation (CA) and the challenges it poses for LTE Advanced user equipment. It describes how CA works by aggregating multiple component carriers to provide bandwidths up to 100MHz. It also discusses the new requirements for cross isolation between transmit and receive bands of at least 50dB. Additionally, it covers various inter-band and intra-band challenges like higher peak-to-average power ratios, increased harmonic distortion, and intermodulation products. Finally, it presents different architectural options for implementing CA including separate antennas, switches, diplexers and multiplexers.
This document provides an overview of basic antenna principles and types used for mobile communications. It discusses the theory behind how antennas work and key definitions such as polarization, radiation pattern, gain and impedance. It also describes different types of antennas used for base stations, vehicles, portable devices and in GSM/DCS networks, including omnidirectional, directional, diversity and indoor antennas. Specific antenna technologies covered include groundplane, skirt, yagi, log-periodic, panel and corner reflector designs.
Challenges In Designing 5 GHz 802.11 ac WIFI Power Amplifierscriterion123
Designing 5 GHz 802.11ac WiFi power amplifiers presents several challenges: (1) meeting the stringent error vector magnitude (EVM) requirement of less than 1.8% due to higher order modulations, (2) ensuring stable performance during dynamic on/off operation while avoiding transients that degrade EVM, and (3) optimizing the power amplifier to achieve both high power-added efficiency and linearity over wide 80/160 MHz bandwidths at 5 GHz frequencies. Addressing these challenges requires careful design of the power amplifier, bias circuits, and matching networks.
The document discusses receiver architecture and design requirements. It covers:
1. The receiver must provide high gain of 100dB while spread across RF, IF, and baseband stages to avoid instability. It must also be sensitive to weak signals down to -110dBm and reject strong adjacent channels.
2. A superheterodyne receiver is most common as it allows for sharper filters at IF to improve selectivity. Downconverting to IF also eases image filtering requirements.
3. Automatic gain control is needed to adjust the receiver gain over a wide range of input signal levels and fit them into the baseband processing range. It helps prevent compression from strong signals exceeding the 1dB compression point.
The document defines an antenna as a metallic device for transmitting and receiving electromagnetic waves between free space and a transmission line. It discusses basic antenna parameters such as radiation resistance, input impedance, polarization, radiation pattern, gain, beamwidth, bandwidth, and efficiency. It also describes common RF connectors and their specifications. Finally, it outlines a test setup using a vector network analyzer to measure antennas and provides formulas for evaluating antennas.
The ABCs of ADCs Understanding How ADC Errors Affect System Performancecriterion123
Dynamic range is an important consideration for digital receivers. A high dynamic range allows a receiver to capture both weak and strong signals. Digital variable gain amplifiers provide gain adjustment to keep signal levels constant at the analog-to-digital converter (ADC) input. Factors like modulation type, noise, distortion, and peak-to-average power ratio determine the required ADC dynamic range. Proper automatic gain control and oversampling can help improve dynamic range performance.
The document describes several receiver designs developed at the Analog and Mixed-Signal Center between 2000-2008, including a Bluetooth receiver, a dual-standard Bluetooth/Wi-Fi receiver ("Chameleon" receiver), and others. It provides details on the system design and individual building blocks for the Bluetooth and Chameleon receivers, such as the low-IF architecture, active complex filter, GFSK demodulator, and time-interleaved pipeline ADC. Experimental results showed the Bluetooth receiver achieved -82dBm sensitivity while the Chameleon receiver achieved -91dBm and -86.5dBm for Bluetooth and Wi-Fi modes respectively.
This document discusses wireless communication network project antenna installation engineering. It provides diagrams and explanations of different types of radio base stations, antenna systems, remote electrical tilt systems, external hybrid combiner units, tower-mounted amplifiers, repeater solutions, smart radio concepts, and in-building solutions. Examples of metro site installations are also included. The document concludes with brief discussions of new generation technologies and problems of technology.
The document discusses Nokia-Siemens Networks, which merged in 2006 and has headquarters in Finland. It provides mobile network services to over 1 billion subscribers through its networks in 150+ countries. The document then describes the base station subsystem (BSS) and its components, including the base transceiver station (BTS), base station controller (BSC), and network switching subsystem (NSS). It provides details on BTS components, transmission units, and tasks performed by the RF team like site surveys, loop breaks, flexi site installations, and intelligent BTS shutdowns.
Microwave technology provides wireless transmission over medium distances using the microwave spectrum. It has advantages over wired systems in areas where cabling is not feasible. Microwaves propagate through free space and can be reflected, refracted, diffracted or scattered. Fading occurs due to multipath reflections and refractions. Fresnel zones must be clear for line of sight transmission. Technologies like space and frequency diversity and adaptive coding and modulation help mitigate fading. Microwave hardware consists of indoor and outdoor units connected by cables. Configurations include split mount, trunk mount and all outdoor. E-band millimeter wave uses higher frequencies for multi-gigabit links over short distances.
1. WCDMA uses BPSK in the uplink and QPSK in the downlink. Pulse shaping uses RRC (Root-Raised-Cosine) to prevent inter-symbol interference caused by group delay variations during wireless transmission.
2. Pulse shaping is introduced to eliminate noise and facilitate demodulation. WCDMA uses the RRC filter, whose time domain shape is the famous Broadcom logo sinc function.
3. LTE uses SC-FDMA in the uplink and OFDMA in the downlink. OFDM more efficiently uses bandwidth and can accommodate more users. Each OFDM sub-carrier is the Broadcom logo sinc function, with all sub-carriers being orthogonal called
With an increasing capacity demand, and a limited frequency spectrum,the operators are forced to utilise the frequency spectrum moreefficiently. High capacity frequency planning techniques are often basedon tight frequency reuse. The networks become interference limited, andin order to maximise the capacity, every available technique to minimiseinterference becomes important.
This document discusses different types of antennas used in mobile devices. It begins by introducing antennas and their roles in transmitting and receiving electromagnetic waves. There are several key parameters discussed for antennas including bandwidth, gain, effective area, radiation pattern, impedance, efficiency, and polarization. The main types of antennas covered are isotropic antennas, which radiate equally in all directions; directional antennas, which radiate more effectively in one direction; and omnidirectional antennas, which radiate in all directions except the azimuth plane. The document focuses on different antenna types used specifically for mobiles, including roof mounted antennas, glass mounted antennas, high gain antennas, and various space diversity antennas oriented horizontally or vertically.
This document discusses the history and types of radio receivers. It describes how the earliest radio receiver was created in 1896 by Alexander Popov and was based on Maxwell's discovery of electromagnetic waves. There are three main types of receivers discussed - crystal radios, tuned radio frequency receivers, and superheterodyne receivers. Crystal radios require no power source beyond the radio waves themselves, while tuned radio frequency receivers have individually tuned amplifier stages and superheterodyne receivers mix signals to extract an intermediate frequency. The document also covers frequency ranges, sensitivity, selectivity and how radio waves propagate.
The AM Receiver and Audio Amplification ProjectAndrew Robson
A Year 1 Media Technology report looking at AM Transmission and Audio amplification.
This written report was submitted as well as an online version which can be found at https://sites.google.com/site/radio2radioproject/home
January 2010
This document provides an overview of network drive testing on 2G/3G networks. It discusses the reasons for performing drive tests, including network performance monitoring, maintenance, benchmarking, and addressing customer complaints. It then outlines the modules to be covered in the training, including an overview of 3G systems, drive test concepts, performing outdoor drive tests, and drive test reporting and analysis. Key topics that will be covered include 3G/UMTS architectures, channelization, handover processes, and the parameters measured during 2G and 3G drive tests.
The document discusses GSM air interface and channel mapping. It introduces GSM frequency bands, channel numbering, physical channels, and logical channels. It explains that logical channels must be mapped to physical channels, with different burst types used for different channel types during transmission. TDMA is used to allocate timeslots on each radio frequency channel for multiple users. Precise synchronization is required for the channel mapping and transmission.
The document discusses tower technician responsibilities, including summarizing:
1) The roles of tower technicians include maintaining cellular tower equipment such as antennas, transmitters, and cables that allow cell phones to connect to networks.
2) Cellular towers use various antenna types and configurations depending on network needs, including directional antennas to focus signals in certain areas and MIMO antennas to increase data capacity.
3) Technicians must understand how cellular network equipment like the base transceiver station (BTS) and antennas function and be able to configure them properly to optimize network performance.
Adjust antenna tilt and azimuth to optimize coverage and reduce interference based on drive test measurements and network analysis. Record changes made to the site configuration.
This document discusses GSM-GPRS antenna operation and related equipment. It covers various antenna types including omnidirectional and directional antennas. It also describes key antenna properties such as gain, polarization, beamwidth, downtilt, front-to-back ratio and intermodulation. Additionally, it discusses other network elements like masthead amplifiers and boosters that are used to improve coverage. The document provides an overview of GSM-GPRS antenna fundamentals and network infrastructure components.
This document discusses trends in wireless technology and networks. It begins by outlining trends in the wireless market and access networks from 1999 to the present. These include a transition from standalone voice services to integrated voice and data services on mobile devices. The document then analyzes the stages of market development from nascent to mature and the accompanying challenges at each stage. Finally, population and internet usage statistics are presented for countries in Asia to provide regional context.
This document discusses the evolution of wireless network technologies including GSM, GPRS, 3G CDMA, CDMA2000, and WCDMA. It provides timelines showing the development of these technologies from 1995 through 2006, including the introduction of capabilities like increased data speeds, packet-optimized networks, and all-IP architectures. The document also examines trends in wireless market growth and the status of internet usage in different Asian countries.
This document discusses trends in wireless technology and networks. It begins with an overview of market trends, noting that by 2005, 60% of speech became mobile and devices fit in the hand. It then covers the evolution of access networks, including the growth of technologies like GSM and GPRS to support increasing mobile data usage. The document also analyzes internet penetration rates and population sizes across Asian countries.
The document discusses GSM-GPRS network operations including:
1. Network identity parameters such as MCC, MNC, LAC, CI which allow identification of network elements and location of mobile stations.
2. Idle mode operations which include cell selection, location updating, and allow mobile stations to receive system information when not in a call.
3. Location update and handover procedures which update the network on a mobile station's location area and allow calls to be maintained as a mobile station moves between cells.
High Tide Technologies provides a satellite telemetry solution for monitoring water and sewer infrastructure. Their system bundles plug-and-play hardware with customizable internet software and satellite communications. Customers need only an internet connection to monitor and control assets like pump stations and tanks in real-time. The system offers two-way communication without the need for towers, repeaters or FCC licenses. Ongoing support is provided for the life of the contract.
Mimo and smart antennas july 2013 finalPraveen Kumar
The document discusses MIMO techniques and antenna configurations used in LTE networks. It describes how LTE supports 1-8 transmit antennas at the base station and 2-8 receive antennas at the UE. The most common configuration is 4x2 MIMO where the base station uses 4 transmit antennas and the UE uses 2 receive antennas. MIMO can increase peak data rates through spatial multiplexing but works best for users with high SINR close to the base station. Open loop MIMO is used for high mobility while closed loop MIMO relies on channel feedback for better performance but only works well in low mobility environments.
This document discusses parameters related to idle mode in GSM-GPRS networks. It describes the structure of BSS parameters including those for the BSC, BTS, handover control, power control, and adjacent cells. It then explains various aspects of idle mode including cell selection, cell reselection using criteria C1 and C2, and how parameters like cellReselectOffset and temporaryOffset can influence cell priority. It also covers cell reselection hysteresis and provides an example of how these parameters can be used in a dual-band network to optimize call setup between different layers.
This document provides an overview of base station antenna technology and deployment. It discusses the evolution from early single antenna systems to current multi-antenna techniques including MIMO and beamforming. Adaptive array beamforming allows dynamic adjustment of antenna patterns to optimize coverage and capacity. Reconfigurable beam antennas provide additional flexibility. The document also covers antenna installation considerations for different base station locations as well as system integration topics such as remote radio heads and combining multiple radio technologies on a single site.
The document discusses GSM-GPRS channel configuration and dimensioning. It covers:
1. Channel configuration options including combined, non-combined, and hybrid configurations and how logical channels are mapped to timeslots.
2. Signaling channel (SDCCH) dimensioning based on call setup load and location update load to determine the number of subscribers that can be supported.
3. Common control channel (CCCH) load calculation including RACH, PCH, and AGCH capacities and how they are used to page mobiles and grant channel access.
The document discusses GPRS operations and procedures. It provides an overview of GPRS architecture, protocols used in GPRS, mobility management procedures like GPRS attach and routing area update, and location management in GPRS. Diagrams are included to illustrate logical architecture, data transfer between network elements, and mobility states of a GPRS mobile station.
Philippe Langlois - SCTPscan Finding entry points to SS7 Networks & Telecommu...P1Security
This document discusses the history of telecommunications security and exploring signaling networks. It begins with the origins of "phreaking" in the 1960s and blue boxes. It then covers more modern threats like SIP account hacking and SS7/SIGTRAN hacking. The document reviews digital telephony concepts and how SS7 networks are organized. It explains how SIGTRAN moved SS7 to TCP/IP using SCTP. It discusses discovering SS7 networks through SCTP scanning and fingerprinting SCTP stacks. The presentation demonstrates SCTPscan and analyzing higher layer protocols with Ethereal.
GRX is the global private network where telecom network operators exchange GPRS roaming traffic of their users. It’s also used for all M2M networks where roaming is used, and that is the case from some company’s truck fleet management system down to intelligence GPS location spybug tracking system.
GPRS has been there from 2.5G GSM networks to the upcoming LTE Advanced networks, and is now quite widespread technology, along with its attacks. GRX has had a structuring role in the global telecom world at a time where IP dominance was beginning to be acknowledged. Now it has expanded to a lightweight structure using both IP technologies and ITU-originated protocols.
In this presentation, we’ll see how this infrastructure is protected and how it can be attacked. We’ll discover the issues with specific telco equipment inside GRX, namely GGSN and SGSN but also now PDN Gateways in LTE and LTE Advanced “Evolved Packet Core”. We will see the implications of this with GTP protocol, DNS infrastructure, AAA servers and core network technologies such as MPLS, IPsec VPNs and their associated routing protocols. These network elements were rarely evaluated for security, and during our engagements with vulnerability analysis, we’ve seen several vulnerabilities that we will be showing in this speech.
We will demo some of the attacks on a simulated “PS Domain” network, that it the IP part of the Telecom Core Network that transports customers’ traffic, and investigate its relationships with legacy SS7, SIGTRAN IP backbones, M2M private corporate VPNs and telecom billing systems. We will also seem how automation enable us to succeed at attacks which are hard to perform and will show how a “sentinel” attack was able to compromise a telecom Core Network during one penetration test.
The document discusses the telemetry, tracking and control (TT&C) subsystem for spacecraft. It describes how TT&C provides communication between the spacecraft and ground stations through functions like carrier tracking, command reception, and telemetry transmission. It outlines the key components of TT&C including command systems, telemetry systems, and considerations for antenna size, transmitter power, and interfaces with other spacecraft subsystems.
Earth stations are systems that transmit and receive signals to and from satellites. They consist of subsystems like transmitters, receivers, antennas, and tracking equipment. Key parameters that affect earth station performance include transmitter power, antenna gain and efficiency, noise temperature, and local weather conditions. The ratio of antenna gain to noise temperature (G/T ratio) is important, as it determines the strength of the received signal relative to thermal noise. Path loss increases significantly with distance between the earth station and satellite due to signal dispersion over the propagation path. Various factors like operating frequency, elevation angle, polarization, and local meteorology can impact propagation impairments.
This document summarizes a presentation about developing a high channel count electrophysiology data acquisition and real-time display system. The key points are:
1) An open-source system called Open Ephys was leveraged, but modifications were needed to support a 64 channel headstage. A translating FPGA was developed to interface the headstage to the Open Ephys hardware.
2) The translating FPGA was designed using a small Lattice FPGA and modules for SPI communication and driving the headstage protocol. It allows the Open Ephys system to support different headstage designs.
3) The 64 channel system was tested in the lab and in the field on a rat. Results showed it could reliably record
Komunikacja bezprzewodowa w obszarach przemysłowychAgnieszka Kuba
Tematyka poruszana w prezentacji:
Podstawy transmisji radiowej
Parametry transmisji radiowej
Ścieżka nadawania
Spadek jakości sygnału wraz ze wzrostem odległości
Wzmocnienie sygnału radiowego
Odbicia i tłumienność
Wpływ czynników atmosferycznych na sygnał radiowy
Typy anten
Równoległe współistnienie sieci bezprzewodowych
Wpływ zakłóceń na sygnał radiowy
This document provides specifications for the Cell-Max Directional High Capacity Venue MIMO Antenna, which operates within frequency bands of 698-960 MHz and 1710-2700 MHz with a beamwidth of 60 degrees. The antenna has a maximum input power of 100 watts per port, an IP65 ingress protection rating, and dimensions of 299.72 mm x 299.72 mm x 124.5 mm.
Automated Traffic Density Detection and Speed MonitoringBharat Biyani
Designed and proposed an RF system to detect speed and traffic density with a RADAR unit in remote areas and to provide real-time monitoring of the traffic density data with a satellite link. Based on calculated parameters, required RF components from real vendors were identified. The system model is then simulated with the obtained parameters in AWR Virtual System Simulator and analyzed nominal and worst case cascaded gain, noise figure, P1dB and OIP3. The general deviation expected in these parameters was determined by performing yield analysis.
This document provides an overview of GSM link budget calculations. It defines key terms used in link budgets such as effective radiated power, antenna gain, diversity gain, receiver sensitivity, path loss, and fade margin. It explains the objectives of calculating a link budget are to estimate maximum allowable path loss, compute required effective isotropically radiated power for a balanced link, estimate coverage design thresholds, and evaluate technology performance. It also provides examples of uplink and downlink link budget calculations for a GSM network and defines indoor, in-car, and outdoor coverage requirements.
This document discusses principles of antenna selection and provides guidance on selecting antenna models for different scenarios. It begins with an overview of antenna principles including dipole antennas and factors that influence antenna gain. It then discusses key parameters to consider when selecting antennas such as radiation pattern, gain, beamwidth, downtilt mode, polarization, frequency range, and impedance. The document provides recommendations for selecting antenna models based on scenarios such as downtown areas, suburbs, water surfaces, narrow land strips, and complicated terrain. It also discusses downtilt techniques and provides examples of specific antenna models.
This document discusses radio frequency (RF) propagation and link budget analysis. It begins by describing the basic components of a transmission system including the transmitter, propagation path, and receiver. It then covers concepts such as free space path loss, antenna gain, effective isotropic radiated power (EIRP), and the near and far field regions. The document also presents models for calculating path loss in different environments, including the free space and Hata models. It concludes by explaining how link budget analysis can be used to determine the maximum allowable path loss between transmitter and receiver given their power levels, antenna gains, losses, and receiver sensitivity.
Choosing the correct antenna for the Mimosa point-to-multipoint (PTMP) solution is critical to delivering a high-performance wireless network. This webinar will review how to get the best ground coverage based on the subscriber density, distances, interference levels and terrain challenges; deployment options for density versus performance, and how to identify quality antennas.
Clipper circuits were studied including series, parallel, and dual clipper configurations. Various clipper circuits were simulated using Multisim software and tested using hardware. Key aspects:
1) Series, parallel, and dual clipper circuits were designed to clip either the positive or negative portions of input signals.
2) Biased and unbiased clipper circuits were analyzed both in simulation and using hardware. External biasing was applied to parallel clipper circuits.
3) Input signals of 5V were clipped in various ways depending on the circuit configuration and applied biases. Output waveforms were observed on an oscilloscope.
4) Clipper circuits have applications in limiting signal amplitudes for applications like FM radio
The document defines an antenna as a metallic device for transmitting and receiving electromagnetic waves between free space and a transmission line. It discusses basic antenna parameters such as radiation resistance, input impedance, polarization, radiation pattern, gain, beamwidth, bandwidth, and efficiency. It also describes common RF connectors like N-connectors and BNC connectors. Finally, it outlines how to test antennas using a vector network analyzer and provides formulas for evaluating antennas based on free space loss, total loss, and received signal level.
study of ttc link and parallel coupled filter designManoj Kumar
ADS is an electronic design automation software used for designing parallel coupled band pass filters in the MHz regime. It provides circuit simulation, 3D electromagnetic field simulation, and flexibility in tackling systems analysis. A parallel coupled band pass filter was designed in ADS with a bandwidth of 4180-4200 MHz and S21/S12 and S22/S11 parameters meeting specified constraints. Simulation results showed the designed filter meeting the center frequency and S21 parameter specifications.
This document provides information about antennas and their characteristics. It discusses different types of antennas like dipole antennas, their radiation patterns which include lobes like major lobes and minor lobes. It also defines important antenna parameters like radiation pattern, isotropic pattern, directional pattern, omnidirectional pattern and their features. Key antenna fundamentals including near field and far field regions, vector potentials and radiation integrals are summarized.
The document discusses simulation and testing of antennas for 4G LTE-MIMO systems. It describes simulating a PIFA antenna in CST Studio Suite to compare matched and unmatched cases. Results showed improved return loss and far-field patterns when the antenna was matched. Testing of a MIMO antenna system involved measuring isolation between antennas and comparing performance with the enclosure open versus closed.
Access the video from this presentation for free from
http://www.rohde-schwarz-usa.com/DebuggingEMISS_On-Demand.html
Overview:
Electromagnetic interference is increasingly becoming a problem in complex systems that must interoperate in both digital and RF domains. When failures due to EMI occur it is often difficult to track down the sources of such failures using standard test receivers and spectrum analyzers. The unique ability of real-time spectrum analysis and synchronous time domain signal acquisition to capture transient events can quickly reveals details about the sources of EMI.
What You Will Learn:
How to isolate and analyze sources of EMI using an oscilloscope
Measurement considerations for correlating time and frequency domains
Near field probing basics
Presented By:
Dave Rishavy, Product Manager Oscilloscopes, Rohde & Schwarz
Dave Rishavy has a BS in Electrical Engineering from Florida State University and an MBA from the University of Colorado. Prior to joining Rohde and Schwarz, Mr. Rishavy gained over 15 years of experience in the test and measurement field at Agilent Technologies. This included positions in a wide range of technical marketing areas such as application engineering, product marketing, marketing management and strategic product planning. While at Agilent, Dave led the marketing and industry segment teams for the Infiniium line of oscilloscopes as well as high end logic analysis.
This document discusses the interference problems that can occur between 850 MHz and 900 MHz networks when deployed in the same area. It focuses specifically on out-of-band emissions from 850 MHz base transceiver stations entering the 900 MHz uplink band. Through a link budget analysis using typical deployment assumptions, it determines the required attenuation of filters needed at various site-to-site distances and antenna isolation levels to reduce interference below sensitivity degradation thresholds. The analysis finds that filtering is necessary, as interference levels without it exceed permissible levels and could degrade coverage up to 6%. The exact attenuation required depends on several network parameters.
This document provides an introduction to key concepts in wireless communication systems. It outlines the main elements of a wireless system including the transmitter, frequency spectrum, modulation, antenna, propagation medium, and receiver. It also discusses wireless history, services, frequency bands, antenna characteristics, signal attenuation and noise. Common modulation techniques like AM, FM, ASK, FSK, PSK and QAM are introduced. The document also covers concepts of multipath propagation, signal-to-noise ratio, and multiplexing methods including TDM, FDM and CDMA.
The document describes a course on "Planning, design and testing of high reliability indoor and outdoor wireless networks". The course consists of 5 sessions covering topics such as radio frequency fundamentals, wireless network planning and design for point-to-point and point-to-multipoint networks, troubleshooting wireless networks, and designing and simulating indoor and outdoor WiFi networks. The course will take place over 6 Thursday evenings from February 4th to February 25th, with an evaluation on the last day.
Pacific Gas and Electric Company discusses solutions to electromagnetic interference (EMI) problems caused by variable-frequency drives (VFDs). Faster switching speeds of modern VFD components produce higher frequency electromagnetic noise. This noise can interfere with control signals and communication devices. Adopting preventative measures like using shielded power cables and separating signal and power wires can minimize EMI issues. Common-mode chokes and EMI filters are also used to reduce conducted and radiated electromagnetic disturbances from VFDs. European Union emission standards provide limits for VFD electromagnetic emissions.
Webinar Slides: Probing Techniques and Tradeoffs – What to Use and Whyteledynelecroy
Engineers must commonly probe low and high frequency signals with high signal fidelity. Typical passive probes with high input impedance and capacitance provide good response at lower frequencies, but inappropriately load the circuit and distort signals at higher frequencies.
Join Teledyne LeCroy for this webinar as we discuss:
- Selecting the right probing techniques to maximize the accuracy of your measurements
- Probe specifications and their implications on the measured signal
- Variety of probes and accessories available for measurement
- Virtual probing software tools that allow the user to probe the signal when direct access is physically impossible
Similar to Modul 6 antenna & related equipments (20)
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...Diana Rendina
Librarians are leading the way in creating future-ready citizens – now we need to update our spaces to match. In this session, attendees will get inspiration for transforming their library spaces. You’ll learn how to survey students and patrons, create a focus group, and use design thinking to brainstorm ideas for your space. We’ll discuss budget friendly ways to change your space as well as how to find funding. No matter where you’re at, you’ll find ideas for reimagining your space in this session.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
Certified as an ISO/IEC 27001: Information Security Management Systems (ISMS) Lead Implementer, Data Protection Officer, and Cyber Risks Analyst, Denis brings a heightened focus on data security, privacy, and cyber resilience to every endeavor.
His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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हिंदी वर्णमाला पीपीटी, hindi alphabet PPT presentation, hindi varnamala PPT, Hindi Varnamala pdf, हिंदी स्वर, हिंदी व्यंजन, sikhiye hindi varnmala, dr. mulla adam ali, hindi language and literature, hindi alphabet with drawing, hindi alphabet pdf, hindi varnamala for childrens, hindi language, hindi varnamala practice for kids, https://www.drmullaadamali.com
How to Fix the Import Error in the Odoo 17Celine George
An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
Beyond Degrees - Empowering the Workforce in the Context of Skills-First.pptxEduSkills OECD
Iván Bornacelly, Policy Analyst at the OECD Centre for Skills, OECD, presents at the webinar 'Tackling job market gaps with a skills-first approach' on 12 June 2024
2. 2
Outline
Base station antenna
specification and
meanings
Antenna types and
trends
Antenna Type And
Developments
Other Elements
kris.sujatmoko@gmail.com
4. 4
Antennas
Categories
Omnidirectional antennas
radiation patterns is constant in the
horizontal plain
useful in flat rural areas
Directional antennas
concentrate main energy into certain
direction
larger communication range
useful in cities, urban areas, sectorised
sites
kris.sujatmoko@gmail.com
6. 6
Antennas - Antenna Gain
Measures the antenna´s capability to transmit/extract energy
to/from the propagation medium (air)
dB over isotropic antenna (dBi)
dB over dipole (dBd)
Antenna gain depends on
mechanical size: A
effective antenna aperture area: w
frequency band
Antenna Gain:
G A w=
4
2
π
λ
Pt
Gain
(Dbi)
Isotropic radiated Power
Equivalent isotropic
radiated power:
EIRP = Pt+Gain(Dbi)
radiated
power
kris.sujatmoko@gmail.com
11. 11
1 dipole (received power) 1mW
Multiple dipole matrix
Received power 4 mW
GAIN = 10log(4mW/1mW) = 6dBd
kris.sujatmoko@gmail.com
12. 12
Gain = 10log(8mW/1mW) = 9dBi
“Sector antenna”
Received power 8mW
“Omnidirectional array”
Received power 1mW
(Overlook
Antenna
kris.sujatmoko@gmail.com
13. 13
GSM 900 : 890-960MHz
GSM 1800 : 1710-1880MHz
GSM dual band : 890-960MHz &
1710-1880MHz
eg.824-960MHz 1710-1900MHz
CDMA2000 1x
Frequency Range
kris.sujatmoko@gmail.com
31. 31
Ratio of maximum
mainlobe to maximum
sidelobe
F/B = 10 log(FP/BP) typically 25dB
Back power Front power
Front to back ratio
kris.sujatmoko@gmail.com
36. 36
IMD@2×43dBm
f1, f2, 2f1-f2, 2f2-f1
913MHz,936MHz,959MHz,982MHz
Third Order Intermodulation
kris.sujatmoko@gmail.com
37. 37
Intermodulation
Intermodulasi
Terjadi akibat penguatan
sistem yang non linier
Hanya orde ke-3 dan
kadang-kadang orde ke-5
yang signifikan
Sinyal dengan amplituda
yang sama menghasilkan
level IM yang sama pada
frek tinggi dan rendah
Sinyal dengan amplituda
berbeda memberikan
level IM yang berbeda
pula
Untuk mencegah
intermodulasi,penguat
dioperasikan pada
penguatan bukan-
maksimum
kris.sujatmoko@gmail.com
38. 38
Intermodulation
Intermodulasi
Komp. Orde 1 :
diharapkan linier
Komp. Orde 2 : frek 2ω
diredam oleh filter
Komp. Orde 3 : frek 3ω
diredam dengan
filter
Penguat
Non-linier
( )
( )tB
tAv
B
Ai
ω
ω
cos
cos
+
=
++
+=
3
2
i
iio
cv
bvavv
Yang bermasalah :
Komponen yang lain
amplituda kecil
( ) ( )ABBA ωωωω −− 2,2
kris.sujatmoko@gmail.com
40. 40
10 Simple Guidelines for RF Safety
All personnel should have EME awareness training
All personnel entering the site must be authorized
Obey all posted signs
Assume all antennas are active
Before working on antennas, notify owners and disable appropriate
transmitters
Maintain minimum 3 feet clearance from all antennas
Do not step in front of antennas
Use personal RF monitors while working near antennas
Never operate transmitters without shields during normal operation
Do not operate base station antennas inside equipment rooms
kris.sujatmoko@gmail.com
45. 45
Antenna Types
By frequency band: GSM900, GSM1800, GSM900/1800
By polarization: Vertical, Horizontal, ±45º linear
polarization, circle polarization
By pattern: Omni-directional, directional
By down-tilt: Non, mechanical, electronic
adjustment, remote control
By function: Transmission, receiving, transceiving
kris.sujatmoko@gmail.com
50. 50
Diversity gain depends on environment
Is there coverage improvement by diversity ?
antenna diversity
equivalent to 5dB more signal strength
more path loss acceptable in link budget
higher coverage range
R
R(div) ~ 1,3 R
A 1,7 A ??
70% more coverage per cell ??
needs less cells in total ??
True only (in theory) if the
environment is infinitely large and
flat
Diversity
Coverage Improvement?
kris.sujatmoko@gmail.com
51. 51
Network Elements
MHA
MastHead Amplifier
(Low Noise
Amplifier)
RX signal amplified
near the antenna in the
top of the mast
Offers better coverage
Eliminates the antenna
cable loss
Increased receiver
sensitivity of the BTS
and cell size
Increased network
quality
Noise Figure £ 2.0 dB (typical)
RX Gain: Up to 12 dB
Dimensions : 266 x 130 x 123 mm
Weight : 5.6 kg (duplexed)
Volume : 4.2 l
IP 65 Enclosure Protection
Power Feeding Through Antenna Coax
Alarms handled in BTS
kris.sujatmoko@gmail.com
52. 52
Booster
• TX signal amplified
• Nokia Booster Configuration
• Booster (PA) Unit (TBU)
• Booster Filtering Unit (AFH)
• Masthead Preamplifier equipment (MHA)
• Output power before combining can be up to 49 dBm
Isolator + combiner + filter (AFH) give roughly 2.5 dB losses
Booster BTS is suitable for all the environments where
enhanced coverage or high output power is needed
Theoretically, cell radius is enhanced up to 60% and the
coverage area is roughly the triple
Network Elements
Booster
TRXTBUAFH
kris.sujatmoko@gmail.com
Antenna downtilt (mechanical or electrical): directional antennas may be tilted either mechanically or electrically in order to lower the main radiation lobe. By downtilting the antenna radiation pattern, field strength levels from this antenna at larger distances can be reduced substantially. Therefore antenna downtilting reduces interference to neighbouring cells while improving spot coverage also. Two types of downtilting exist: Mechanical downtilting means that the antenna is pointed towards the ground in the main beam direction. At the same time the back lobe is uptilted. Electrical downtilting has the advantage that the antenna pattern is shaped so that the main beam and the back lobe are downtilted. In order to be able to control the interference situation it is better to use electrical down tilting. With omnidirectional antennas, mechanical downtilting is not applicable, but only electrical. Electrical downtilting is performed by internal slight phase shifts in the feeder signals to the elementary dipoles of the antenna system.
10
11
Diversity techniques are based on the fact that receiving multiple uncorrelated copies of the same signal, at the same or delayed time, can reduce fast fading dips. When two received signals are combined, the achieved signal quality is better than either of the partial signals separately. There are different diversity reception schemes (see Figure 17): both the base station and the mobile station implement time diversity already by interleaving. Frequency diversity can be achieved with frequency hopping: since fast fading is frequency dependent, many frequencies are quickly and cyclically hopped so that if one frequency is in a fading dip, it is just for a very brief time. Traditionally two base station receiver antennas have been separated horizontally (usually) or vertically (seldom) to create space diversity. In urban environment, the same diversity gain can be achieved by using polarisation diversity: signals are received using two orthogonal polarisations at the reception end. In the mobile radio channel multipath propagation is present. The delayed and attenuated signal copies can be combined in a proper way to increase the level of the received signal (multipath diversity). In GSM it is performed by an equaliser, while in W-CDMA (Wideband-CDMA) a so called "rake receiver" is utilized. The most used methods in cellular network planning are space and polarisation diversity, as far as base station antennas are concerned. Space Diversity Space diversity is a traditional diversity method, especially used in macrocells. Spatial antenna array separation causes different multipath lengths between a mobile station and a base station. Partial signals arrive at the receiving end in different phases. The two antenna arrays must be separated horizontally in order to achieve uncorrelated signals. Space diversity performs very well with macrocells in all environments, giving diversity gain of about 4-5 dB. In microcells, the large antenna configurations are not often possible due to site acquisition and environmental reasons. Antennas must be small and easily hidden. The amount of physical antenna equipment must be minimised. Antennas are often placed on lampposts or other existing structures, in which spatial separation is not possible. On the other hand, arranging the antenna arrays within one physical antenna doesn’t provide big enough separation between the arrays. Therefore other means of providing diversity is required in urban microcellular environment. Polarisation Diversity Uncorrelated signals can be provided without physical separation by applying different orthogonal linear polarisation at the receiving end. Signals can be received using for example horizontal and vertical or 45 slanted polarisation in cross-polarised antennas. The performance of polarisation diversity technique depends on the environment and the reflections between mobile station and base station. The more the partial signals reflect and diffract along the route, the more uncorrelated the signals are at the receiver, and the more gain can be achieved. The polarisation diversity gain can be measured as improved bit error rate (BER) or frame erasure rate (FER) at the receiver. In very dense urban areas, where narrow streets and high buildings surround the site, more than 5 dB diversity gain – equal to that of space diversity – has been measured. On the other hand, in the open areas and LOS situations, signal does not reflect enough on the way and cross-polarisation would not give any additional gain. This must be taken into account as slightly decreased signal quality with low field strength levels. Since cross-polarised antennas are small and suitable for urban areas, cross-polarisation diversity is the preferred diversity method for microcells. Combining Two main combining methods are used to take advantage of the signals in space or polarisation diversity: Selection combining: every antenna signal branch is demodulated, C/I and bit error rates (BER) are calculated and then all signal branches are sampled at regular time intervals, always the best signal branch is selected for further processing. This method passes only a single branch and rejects all other signals. Maximal ratio combining: antenna signals are individually amplified at the same amplitudes, the signal phasing is assessed. Signal samples are added (vector addition) with correct phase adjustments. Then the combined signal is demodulated and further processed. This diversity method achieves a C/I improvement due to the fact that the wanted information (carrier signal) from different antenna branches are strongly correlated, while the additive noise components are uncorrelated (assuming white Gaussian noise process). In the superposition of both signals the wanted components will constructively add, while the noise components eliminate each other. (Note: If antennas are not sufficiently separated from each other, also the noise processes of both antennas will be correlated and the C/I improvement therefore decreases to zero.)
In link budget calculations, antenna diversity brings a signal improvement of ~ 5 dB. Note that this is not a physical improvement, i.e. a signal that is stronger by 5 dB (physically impossible), but rather an equivalent gain. The improvement in signal quality, i.e. in bit error rate, is the same as could be expected by a signal stronger by 5 dB. It is an “indirect gain”. This higher equivalent gain allows for a higher tolerable path loss, i.e. a larger communication range. One supplier company claims that by 3 dB more allowable path loss they could provide 20% more coverage range, i.e. 40% more coverage area per cell. Conclusion was, that therefore they need 40% less base stations to cover the same area size. This cunningly simple calculation is also stunningly wrong. It would be in theory true if the environment were infinitely large and flat, if there were exactly zero overlap between cells and the cells were placed exactly regularly and there were absolutely no obstacles within the entire area. This obviously is not the case in real life.