This document provides an overview of pulse analog modulation techniques including PAM, PWM, and PPM. It discusses the generation and demodulation of these signals. It also covers time division multiplexing (TDM) and frequency division multiplexing (FDM), comparing their advantages and disadvantages. TDM assigns time slots to individual signals while FDM assigns different carrier frequencies within the channel bandwidth. The document concludes with details about digital transmission and the T-carrier hierarchy for telephone systems.
The document discusses digital transmission and multiplexing techniques. It begins by defining digital transmission as the transmission of digital signals between two or more points in a communications system. It then describes several multiplexing techniques including time-division multiplexing (TDM), frequency-division multiplexing (FDM), and code-division multiplexing (CDM). The document also discusses the evolution of digital multiplexing standards from Plesiochronous Digital Hierarchy (PDH) to Synchronous Digital Hierarchy (SDH), noting that SDH provides a simpler, more economical, and flexible telecom infrastructure compared to PDH.
Pulse Amplitude (PAM)
Pulse Width (PWM/PLM/PDM)
Pulse Position (PPM)
Comparison of PAM, PWM and PPM
Pulse Code (PCM)
Delta (DM)
Comparison of DM and PCM
This document discusses various types of pulse modulation techniques. It describes analog pulse modulation techniques including pulse amplitude modulation (PAM), pulse duration modulation (PDM), and pulse position modulation (PPM). It also covers digital pulse modulation techniques such as pulse code modulation (PCM) and delta modulation. For each technique, it provides details on the generator, waveform, and advantages and disadvantages. In conclusion, it summarizes that different pulse modulation techniques were discussed along with how they are transmitted and their waveforms. It also reviews the advantages and disadvantages of these modulation methods.
lecturenote_1681299989Chapter 5- digital transmission.pdfAyadAABDULKAFI
Digital transmission involves transmitting digital signals between two points. Pulse modulation converts analog signals into discrete digital pulses that are transmitted over a physical medium. Pulse code modulation (PCM) is commonly used for digital transmission and involves sampling, quantizing, and coding analog signals into digital pulses. Multiplexing techniques like time-division multiplexing (TDM) and frequency-division multiplexing (FDM) allow multiple signals to be transmitted over the same channel by allocating different time slots or frequency bands to each signal.
The document discusses various types of pulse modulation techniques including pulse amplitude modulation (PAM), pulse width modulation (PWM), pulse position modulation (PPM), and pulse code modulation (PCM). It provides details on the basic principles, components, and advantages of each technique. PCM is described as the digital form of pulse modulation where the analog signal is converted to digital pulses by sampling, quantizing, and encoding the signal. The minimum sampling rate required by the Nyquist theorem and examples of calculating bit rates for PCM are also covered.
This document discusses various methods for compressing analog and digital data. It begins by explaining why analog signals are modulated, such as to allow for more efficient transmission. It then covers analog to digital conversion techniques like pulse code modulation (PCM). On the digital side, it discusses lossless compression methods like run-length encoding, Huffman encoding, and Lempel-Ziv encoding. Lossy compression techniques like JPEG and MPEG are also summarized. The document aims to provide an overview of different data compression strategies.
1. Pulse code modulation (PCM) is a method of digitizing analog signals by sampling the signal, quantizing the samples to a set of discrete levels, and encoding the results as digital data.
2. In PCM, an analog signal is sampled, quantized to a certain number of levels, and then encoded as binary digits. At the receiver, the digital signal is decoded, converting it back into an analog waveform.
3. Key aspects of PCM include sampling the analog signal, quantizing the samples to discrete levels, binary encoding the quantized samples, transmitting the encoded data, decoding the data back into quantized samples, and reconstructing the analog signal from the samples. PCM
The document discusses digital transmission and multiplexing techniques. It begins by defining digital transmission as the transmission of digital signals between two or more points in a communications system. It then describes several multiplexing techniques including time-division multiplexing (TDM), frequency-division multiplexing (FDM), and code-division multiplexing (CDM). The document also discusses the evolution of digital multiplexing standards from Plesiochronous Digital Hierarchy (PDH) to Synchronous Digital Hierarchy (SDH), noting that SDH provides a simpler, more economical, and flexible telecom infrastructure compared to PDH.
Pulse Amplitude (PAM)
Pulse Width (PWM/PLM/PDM)
Pulse Position (PPM)
Comparison of PAM, PWM and PPM
Pulse Code (PCM)
Delta (DM)
Comparison of DM and PCM
This document discusses various types of pulse modulation techniques. It describes analog pulse modulation techniques including pulse amplitude modulation (PAM), pulse duration modulation (PDM), and pulse position modulation (PPM). It also covers digital pulse modulation techniques such as pulse code modulation (PCM) and delta modulation. For each technique, it provides details on the generator, waveform, and advantages and disadvantages. In conclusion, it summarizes that different pulse modulation techniques were discussed along with how they are transmitted and their waveforms. It also reviews the advantages and disadvantages of these modulation methods.
lecturenote_1681299989Chapter 5- digital transmission.pdfAyadAABDULKAFI
Digital transmission involves transmitting digital signals between two points. Pulse modulation converts analog signals into discrete digital pulses that are transmitted over a physical medium. Pulse code modulation (PCM) is commonly used for digital transmission and involves sampling, quantizing, and coding analog signals into digital pulses. Multiplexing techniques like time-division multiplexing (TDM) and frequency-division multiplexing (FDM) allow multiple signals to be transmitted over the same channel by allocating different time slots or frequency bands to each signal.
The document discusses various types of pulse modulation techniques including pulse amplitude modulation (PAM), pulse width modulation (PWM), pulse position modulation (PPM), and pulse code modulation (PCM). It provides details on the basic principles, components, and advantages of each technique. PCM is described as the digital form of pulse modulation where the analog signal is converted to digital pulses by sampling, quantizing, and encoding the signal. The minimum sampling rate required by the Nyquist theorem and examples of calculating bit rates for PCM are also covered.
This document discusses various methods for compressing analog and digital data. It begins by explaining why analog signals are modulated, such as to allow for more efficient transmission. It then covers analog to digital conversion techniques like pulse code modulation (PCM). On the digital side, it discusses lossless compression methods like run-length encoding, Huffman encoding, and Lempel-Ziv encoding. Lossy compression techniques like JPEG and MPEG are also summarized. The document aims to provide an overview of different data compression strategies.
1. Pulse code modulation (PCM) is a method of digitizing analog signals by sampling the signal, quantizing the samples to a set of discrete levels, and encoding the results as digital data.
2. In PCM, an analog signal is sampled, quantized to a certain number of levels, and then encoded as binary digits. At the receiver, the digital signal is decoded, converting it back into an analog waveform.
3. Key aspects of PCM include sampling the analog signal, quantizing the samples to discrete levels, binary encoding the quantized samples, transmitting the encoded data, decoding the data back into quantized samples, and reconstructing the analog signal from the samples. PCM
This document discusses several multiple access techniques used in satellite communications, including Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Demand Access Multiple Access (DAMA), and Code Division Multiple Access (CDMA). FDMA divides the available frequency band into non-overlapping channels. TDMA allows multiple earth stations to share a transponder by taking turns transmitting bursts of signals. DAMA allocates satellite channels to users on demand. CDMA encodes signals so that a receiving station can recover information from an individual transmitter using the correct code.
This document discusses digital pulse modulation techniques. It provides an overview of pulse amplitude modulation (PAM), pulse width modulation (PWM), pulse position modulation (PPM), and pulse code modulation (PCM). It describes the basic principles of each technique, including how the signal is modulated by varying different pulse parameters. It also discusses sampling, quantization, encoding, and other components involved in digital pulse modulation systems.
Data encoding and modulation techniques are discussed. Modulation involves varying properties of a high-frequency carrier signal according to a message signal. This allows transmission of baseband signals over long distances. Common modulation types are amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM). Encoding converts data into formats for transmission, storage, processing and more. Common encoding schemes for digital data transmission include non-return to zero (NRZ) encoding and Manchester encoding. Pulse modulation can transmit signals as pulses using techniques like pulse code modulation (PCM).
This document discusses multiplexing and spreading techniques. It explains that multiplexing combines multiple analog or digital signals into one signal over a shared medium to efficiently use scarce resources. The main multiplexing techniques covered are frequency-division multiplexing (FDM), time-division multiplexing (TDM), wavelength-division multiplexing (WDM), and code-division multiple access (CDMA). It also discusses spread spectrum techniques like frequency hopping spread spectrum (FHSS) and direct sequence spread spectrum (DSSS) that spread signals across bandwidths.
The document provides information about baseband transmission in digital communication. It discusses various concepts related to baseband transmission including: pulse code modulation (PCM) systems, source encoding, sampling, quantization, channel encoding, digital modulation, and line coding techniques such as NRZ and RZ. The key steps in baseband transmission are described as: converting the analog signal to digital using sampling and quantization, encoding the digital signal, modulating the encoded digital signal to transmit over the channel, and demodulating and decoding at the receiver to reconstruct the original analog signal.
Base band transmission
*Wave form representation of binary digits
*PCM, DPCM, DM, ADM systems
*Detection of signals in Gaussian noise
*Matched filter - Application of matched filter
*Error probability performance of binary signaling
*Multilevel base band transmission
*Inter symbol interference
*Eye pattern
*Companding
*A law and μ law
*Correlation receiver
This document discusses multiple access techniques used in satellite communications. It describes Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), and Space Division Multiple Access (SDMA). It then discusses transponder assignment modes like Preassigned Multiple Access (PAMA), Demand Assigned Multiple Access (DAMA), and Random Multiple Access (RMA). Finally, it provides more details on FDMA and TDMA frame structures, burst structures, and their advantages and disadvantages.
This document discusses different digital transmission techniques for analog signals. It covers the bandwidth requirements of PCM and introduces delta modulation (DM) and its limitations like slope overload and granular noise. Adaptive delta modulation (ADM) is presented as an improvement over DM. Time-division multiplexing (TDM) is also introduced along with the standards DS1/T1/E1. The transmission modes of parallel, asynchronous, synchronous and isochronous serial transmission are defined.
satellite communication jntuh
Satellite Link Design: Basic Transmission Theory, System Noise Temperature, and G/T Ratio,
Design of Down Links, Up Link Design, Design Of Satellite Links For Specified C/N, System Design
Examples.
Multiple Access: Frequency Division Multiple Access (FDMA), Inter modulation, Calculation of C/N,
Time Division Multiple Access (TDMA), Frame Structure, Examples, Satellite Switched TDMA
Onboard Processing, DAMA, Code Division Multiple Access (CDMA), Spread Spectrum Transmission
and Reception.
This document discusses bandwidth utilization and multiplexing techniques. It begins by explaining that bandwidth is a precious commodity in communication and that bandwidth utilization aims to make wise use of available bandwidth. It then discusses various multiplexing techniques including frequency-division multiplexing (FDM), time-division multiplexing (TDM), and wavelength-division multiplexing (WDM). For each technique, it provides examples and applications. It also covers digital carrier systems like T1, T2, T3 and discusses the North American digital multiplexing hierarchy.
Unit – 3 process data multiplexing demultiplexing techniqueshiya123jes
There are three main types of multiplexing techniques: analog, digital, and optical. Analog techniques include frequency division multiplexing (FDM) and wavelength division multiplexing (WDM). Digital techniques include time division multiplexing (TDM) and code division multiplexing (CDM). Multiplexing allows transmitting multiple signals over a single channel, saving costs. However, each technique has advantages and disadvantages related to bandwidth usage, complexity, synchronization needs, and susceptibility to distortion. Multiplexing is widely used in applications like telephony, satellite and fiber optic communications.
This document contains a summary of key concepts in digital communication. It discusses digital communication, quantizing, encoding, advantages and disadvantages of digital communication, basic signal processing operations, common channels used, telephone channel specifications, adaptive equalization, waveform coding techniques including pulse modulation, analog pulse modulation types, digital pulse modulation types like PCM and DM, sampling, quantizing, uniform and non-uniform quantization, companding, applications of PCM, advantages and disadvantages of delta modulation and DPCM, and an introduction to digital modulation techniques.
DIGITALModulation.pptx "Advanced Digital Modulation Techniques"neltalagtag025
"Advanced Digital Modulation Techniques" explores cutting-edge methods shaping modern communication systems. This comprehensive guide delves into intricate algorithms and protocols enhancing data transmission efficiency and reliability. From phase-shift keying (PSK) to quadrature amplitude modulation (QAM), readers uncover the intricate nuances of signal modulation, demodulation, and error correction. The text navigates through the evolution of digital modulation, shedding light on emerging trends like orthogonal frequency-division multiplexing (OFDM) and software-defined radio (SDR). Engineers, researchers, and students alike benefit from practical insights, case studies, and simulations, empowering them to design, optimize, and troubleshoot complex digital communication systems in today's dynamic technological landscape.
This document summarizes various pulse modulation techniques including:
- Pulse-amplitude modulation (PAM) where the carrier amplitude changes with the message signal amplitude.
- Pulse-duration modulation (PDM) where the carrier width changes with the message signal amplitude.
- Pulse-position modulation (PPM) where the carrier position changes with the message signal amplitude.
- Digital pulse modulation techniques like pulse code modulation (PCM) and differential PCM (DPCM) are also discussed. Advantages and disadvantages of each technique are provided.
OFDM is a multi-carrier modulation technique that divides the available spectrum into multiple orthogonal subcarriers. It overcomes the issues of multi-path transmission and inter-symbol interference. OFDM works by splitting a high-rate data stream into multiple low-rate streams that are transmitted simultaneously over subcarriers. At the receiver, these signals are combined to reconstruct the original high-rate data stream. Key aspects of OFDM include the use of an IFFT/FFT, adding a cyclic prefix, and equalization to compensate for multi-path fading on individual subcarriers. OFDM is used in various wireless technologies like Wi-Fi, WiMAX, DVB, and LTE due to its robustness against multi-path interference
This document discusses digital communication systems and baseband pulse transmission. It covers topics such as:
1. Matched filters, which maximize signal-to-noise ratio and minimize error rates. Properties of matched filters include maximizing SNR and minimizing bit error rate.
2. Inter-symbol interference caused by time dispersion effects from the equivalent system transfer function. This can cause interference at sampling times.
3. Nyquist's criterion for distortionless transmission, including the ideal Nyquist pulse and filter. The ideal Nyquist filter has a sinc function impulse response.
4. Raised cosine filters and their spectrum, which satisfy Nyquist's criterion and avoid inter-symbol interference.
It also briefly mentions cor
This document discusses various digital modulation and multiplexing techniques. It begins by explaining the differences between analog and pulse modulation. It then discusses key concepts like sampling, quantization, and the sampling theorem. It provides details on pulse amplitude modulation (PAM) including flat top and natural PAM. The document also covers pulse code modulation (PCM), differential PCM (DPCM), delta modulation, and adaptive delta pulse code modulation. It defines line coding and discusses time division multiplexing (TDM) and frequency division multiplexing (FDM).
This presentation include the basic concept of communication, modulation techniques in analog and digital. ADC (Analog to Digital Conversion) and Demodulation schemes
This document discusses angle modulation techniques, including frequency modulation (FM) and phase modulation (PM). It provides details on narrowband FM, wideband FM, and their applications. Methods for generating and demodulating FM signals are also covered, including using a voltage-controlled oscillator, Foster-Seeley discriminator, and ratio detector. Generation of narrowband FM is discussed as well as the indirect Armstrong method for generating wideband FM from narrowband FM.
This document discusses various modulation techniques used in analog and digital communication systems. It covers amplitude modulation (AM) theory and its mathematical expression. It also discusses double sideband suppressed carrier modulation (DSB-SC), coherent detection of DSB-SC signals using a local oscillator. Quadrature carrier multiplexing is described which allows transmission of two message signals. Methods for generating single sideband (SSB) signals including filter, phase-shift and Weaver's method are outlined. Vestigial sideband (VSB) modulation motivation, sideband shaping filter and detection are summarized. Generation of VSB uses similar filter or phase discrimination methods as SSB.
This document discusses several multiple access techniques used in satellite communications, including Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Demand Access Multiple Access (DAMA), and Code Division Multiple Access (CDMA). FDMA divides the available frequency band into non-overlapping channels. TDMA allows multiple earth stations to share a transponder by taking turns transmitting bursts of signals. DAMA allocates satellite channels to users on demand. CDMA encodes signals so that a receiving station can recover information from an individual transmitter using the correct code.
This document discusses digital pulse modulation techniques. It provides an overview of pulse amplitude modulation (PAM), pulse width modulation (PWM), pulse position modulation (PPM), and pulse code modulation (PCM). It describes the basic principles of each technique, including how the signal is modulated by varying different pulse parameters. It also discusses sampling, quantization, encoding, and other components involved in digital pulse modulation systems.
Data encoding and modulation techniques are discussed. Modulation involves varying properties of a high-frequency carrier signal according to a message signal. This allows transmission of baseband signals over long distances. Common modulation types are amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM). Encoding converts data into formats for transmission, storage, processing and more. Common encoding schemes for digital data transmission include non-return to zero (NRZ) encoding and Manchester encoding. Pulse modulation can transmit signals as pulses using techniques like pulse code modulation (PCM).
This document discusses multiplexing and spreading techniques. It explains that multiplexing combines multiple analog or digital signals into one signal over a shared medium to efficiently use scarce resources. The main multiplexing techniques covered are frequency-division multiplexing (FDM), time-division multiplexing (TDM), wavelength-division multiplexing (WDM), and code-division multiple access (CDMA). It also discusses spread spectrum techniques like frequency hopping spread spectrum (FHSS) and direct sequence spread spectrum (DSSS) that spread signals across bandwidths.
The document provides information about baseband transmission in digital communication. It discusses various concepts related to baseband transmission including: pulse code modulation (PCM) systems, source encoding, sampling, quantization, channel encoding, digital modulation, and line coding techniques such as NRZ and RZ. The key steps in baseband transmission are described as: converting the analog signal to digital using sampling and quantization, encoding the digital signal, modulating the encoded digital signal to transmit over the channel, and demodulating and decoding at the receiver to reconstruct the original analog signal.
Base band transmission
*Wave form representation of binary digits
*PCM, DPCM, DM, ADM systems
*Detection of signals in Gaussian noise
*Matched filter - Application of matched filter
*Error probability performance of binary signaling
*Multilevel base band transmission
*Inter symbol interference
*Eye pattern
*Companding
*A law and μ law
*Correlation receiver
This document discusses multiple access techniques used in satellite communications. It describes Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), and Space Division Multiple Access (SDMA). It then discusses transponder assignment modes like Preassigned Multiple Access (PAMA), Demand Assigned Multiple Access (DAMA), and Random Multiple Access (RMA). Finally, it provides more details on FDMA and TDMA frame structures, burst structures, and their advantages and disadvantages.
This document discusses different digital transmission techniques for analog signals. It covers the bandwidth requirements of PCM and introduces delta modulation (DM) and its limitations like slope overload and granular noise. Adaptive delta modulation (ADM) is presented as an improvement over DM. Time-division multiplexing (TDM) is also introduced along with the standards DS1/T1/E1. The transmission modes of parallel, asynchronous, synchronous and isochronous serial transmission are defined.
satellite communication jntuh
Satellite Link Design: Basic Transmission Theory, System Noise Temperature, and G/T Ratio,
Design of Down Links, Up Link Design, Design Of Satellite Links For Specified C/N, System Design
Examples.
Multiple Access: Frequency Division Multiple Access (FDMA), Inter modulation, Calculation of C/N,
Time Division Multiple Access (TDMA), Frame Structure, Examples, Satellite Switched TDMA
Onboard Processing, DAMA, Code Division Multiple Access (CDMA), Spread Spectrum Transmission
and Reception.
This document discusses bandwidth utilization and multiplexing techniques. It begins by explaining that bandwidth is a precious commodity in communication and that bandwidth utilization aims to make wise use of available bandwidth. It then discusses various multiplexing techniques including frequency-division multiplexing (FDM), time-division multiplexing (TDM), and wavelength-division multiplexing (WDM). For each technique, it provides examples and applications. It also covers digital carrier systems like T1, T2, T3 and discusses the North American digital multiplexing hierarchy.
Unit – 3 process data multiplexing demultiplexing techniqueshiya123jes
There are three main types of multiplexing techniques: analog, digital, and optical. Analog techniques include frequency division multiplexing (FDM) and wavelength division multiplexing (WDM). Digital techniques include time division multiplexing (TDM) and code division multiplexing (CDM). Multiplexing allows transmitting multiple signals over a single channel, saving costs. However, each technique has advantages and disadvantages related to bandwidth usage, complexity, synchronization needs, and susceptibility to distortion. Multiplexing is widely used in applications like telephony, satellite and fiber optic communications.
This document contains a summary of key concepts in digital communication. It discusses digital communication, quantizing, encoding, advantages and disadvantages of digital communication, basic signal processing operations, common channels used, telephone channel specifications, adaptive equalization, waveform coding techniques including pulse modulation, analog pulse modulation types, digital pulse modulation types like PCM and DM, sampling, quantizing, uniform and non-uniform quantization, companding, applications of PCM, advantages and disadvantages of delta modulation and DPCM, and an introduction to digital modulation techniques.
DIGITALModulation.pptx "Advanced Digital Modulation Techniques"neltalagtag025
"Advanced Digital Modulation Techniques" explores cutting-edge methods shaping modern communication systems. This comprehensive guide delves into intricate algorithms and protocols enhancing data transmission efficiency and reliability. From phase-shift keying (PSK) to quadrature amplitude modulation (QAM), readers uncover the intricate nuances of signal modulation, demodulation, and error correction. The text navigates through the evolution of digital modulation, shedding light on emerging trends like orthogonal frequency-division multiplexing (OFDM) and software-defined radio (SDR). Engineers, researchers, and students alike benefit from practical insights, case studies, and simulations, empowering them to design, optimize, and troubleshoot complex digital communication systems in today's dynamic technological landscape.
This document summarizes various pulse modulation techniques including:
- Pulse-amplitude modulation (PAM) where the carrier amplitude changes with the message signal amplitude.
- Pulse-duration modulation (PDM) where the carrier width changes with the message signal amplitude.
- Pulse-position modulation (PPM) where the carrier position changes with the message signal amplitude.
- Digital pulse modulation techniques like pulse code modulation (PCM) and differential PCM (DPCM) are also discussed. Advantages and disadvantages of each technique are provided.
OFDM is a multi-carrier modulation technique that divides the available spectrum into multiple orthogonal subcarriers. It overcomes the issues of multi-path transmission and inter-symbol interference. OFDM works by splitting a high-rate data stream into multiple low-rate streams that are transmitted simultaneously over subcarriers. At the receiver, these signals are combined to reconstruct the original high-rate data stream. Key aspects of OFDM include the use of an IFFT/FFT, adding a cyclic prefix, and equalization to compensate for multi-path fading on individual subcarriers. OFDM is used in various wireless technologies like Wi-Fi, WiMAX, DVB, and LTE due to its robustness against multi-path interference
This document discusses digital communication systems and baseband pulse transmission. It covers topics such as:
1. Matched filters, which maximize signal-to-noise ratio and minimize error rates. Properties of matched filters include maximizing SNR and minimizing bit error rate.
2. Inter-symbol interference caused by time dispersion effects from the equivalent system transfer function. This can cause interference at sampling times.
3. Nyquist's criterion for distortionless transmission, including the ideal Nyquist pulse and filter. The ideal Nyquist filter has a sinc function impulse response.
4. Raised cosine filters and their spectrum, which satisfy Nyquist's criterion and avoid inter-symbol interference.
It also briefly mentions cor
This document discusses various digital modulation and multiplexing techniques. It begins by explaining the differences between analog and pulse modulation. It then discusses key concepts like sampling, quantization, and the sampling theorem. It provides details on pulse amplitude modulation (PAM) including flat top and natural PAM. The document also covers pulse code modulation (PCM), differential PCM (DPCM), delta modulation, and adaptive delta pulse code modulation. It defines line coding and discusses time division multiplexing (TDM) and frequency division multiplexing (FDM).
This presentation include the basic concept of communication, modulation techniques in analog and digital. ADC (Analog to Digital Conversion) and Demodulation schemes
This document discusses angle modulation techniques, including frequency modulation (FM) and phase modulation (PM). It provides details on narrowband FM, wideband FM, and their applications. Methods for generating and demodulating FM signals are also covered, including using a voltage-controlled oscillator, Foster-Seeley discriminator, and ratio detector. Generation of narrowband FM is discussed as well as the indirect Armstrong method for generating wideband FM from narrowband FM.
This document discusses various modulation techniques used in analog and digital communication systems. It covers amplitude modulation (AM) theory and its mathematical expression. It also discusses double sideband suppressed carrier modulation (DSB-SC), coherent detection of DSB-SC signals using a local oscillator. Quadrature carrier multiplexing is described which allows transmission of two message signals. Methods for generating single sideband (SSB) signals including filter, phase-shift and Weaver's method are outlined. Vestigial sideband (VSB) modulation motivation, sideband shaping filter and detection are summarized. Generation of VSB uses similar filter or phase discrimination methods as SSB.
The document summarizes transmitters and receivers. It describes different types of transmitters including AM and FM transmitters. It discusses components of transmitters like modulators, amplifiers, and transmission antennas. It also covers different types of receivers including tuned radio frequency (TRF) receivers and superheterodyne receivers. It provides details on components of receivers like RF sections, intermediate frequency amplifiers, and automatic gain control. It compares AM and FM receivers and discusses amplitude limiting in FM receivers.
This document discusses different types of noise sources and noise theory concepts. It covers shot noise, thermal noise, and white noise. It also discusses noise equivalent temperature, narrowband noise representation, noise figure, signal-to-noise ratio (SNR), and noise in different communication systems using amplitude modulation (AM), frequency modulation (FM), and coherent/envelope detection. Key concepts summarized include noise figure determination, narrowband noise representation using in-phase and quadrature components, noise properties, and figures of merit for different modulation schemes in the presence of noise.
This document discusses angle modulation techniques including phase modulation and frequency modulation. It covers the concepts of narrowband FM and wideband FM, including their modulation indices and transmission bandwidths. Methods for generating FM signals directly using reactance modulators or indirectly using the Armstrong method are described. FM demodulation can be achieved using slope detectors or phase difference discriminators in circuits like the single tuned discriminator, balanced slope detector, Foster-Seeley discriminator, or ratio detector. A phase locked loop can also act as an FM demodulator. Pre-emphasis and de-emphasis techniques are mentioned.
This document discusses amplitude modulation techniques. It introduces amplitude modulation, its need, and classification. It describes different types of amplitude modulation including DSBSC, DSBFC, SSB, and VSB. It discusses modulation index, spectra, power relations, and bandwidth for AM. It also covers AM generation methods like the square law modulator, balanced modulator, and ring modulator. Finally, it briefly introduces AM modulators and modulation levels.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
In this slide, we'll explore how to set up warehouses and locations in Odoo 17 Inventory. This will help us manage our stock effectively, track inventory levels, and streamline warehouse operations.
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The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
How to Build a Module in Odoo 17 Using the Scaffold MethodCeline George
Odoo provides an option for creating a module by using a single line command. By using this command the user can make a whole structure of a module. It is very easy for a beginner to make a module. There is no need to make each file manually. This slide will show how to create a module using the scaffold method.
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.
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
1. UNIT V-PULSE ANALOG
MODULATION
Types of Pulse modulation, PAM (Single polarity,
double polarity) PWM: Generation & demodulation of
PWM, PPM, Generation and demodulation of PPM,
Demodulation of Pulse Analog Modulated Signals,
Time Division Multiplexing, FDM,TDM Vs FDM
2. INTRODUCTION TO DIGITAL TRANSMISSION
• Digital transmission is the transmission digital data between two or more points in a
communication system.
• The signals can be binary or any other form of discrete-level digital pulses.
• The original information may be in digital form, or it could be analog signals that
have been converted to digital pulses prior to transmission and converted back to
analog signals at the receiver side.
• A pair of wires, coaxial cable, or an optical fiber cable, is used as transmission
medium or channel.
Advantages of Digital Transmission
Noise Immunity:
Multiplexing:
It is much simpler to store digital signals and process it further.(suitable for
digital signal processing).
Digital signals are easy to interface with different types of equipment.
3. PULSE MODULATION
• In analog modulation systems such as AM, FM and PM, the carrier signal is high
frequency sinusoidal signal.
• In pulse modulation system, the carrier is train of discrete pulses rather than being a
sine wave.
Definition
Pulse modulation consists of sampling the analog information signals and then
converting those samples into discrete pulses and transmitting the pulses from a source
to a destination over a physical transmission medium or channel.
• Any one characteristics of the pulse train i.e., amplitude, width or position can be
varied with respect to amplitude of the modulating signal.
5. Pulse Amplitude Modulation (PAM) Definition:
"The amplitude of a constant width, constant-position pulse is varied with respect
to the amplitude of the sample of the modulating signal".
Types of Pulse Amplitude Modulation:
• Single Polarity PAM
• Double Polarity PAM
➢ Single polarity PAM is a situation where a suitable fixed DC bias is added
to the signal to ensure that all the pulses are positive.
➢ Double polarity PAM is a situation where the pulses are both positive and
negative.
Pulse Width Modulation (PWM) :
The width of a constant amplitude, carrier pulse is varied with respect to the
amplitude of the sample of the modulating signal"
Pulse Postion Modulation (PPM) :
The position of a constant –width pulse within a priscribed time slot is varied
according to the amplitude of the sample of the modulating signal"
6. The width and positions of the pulses are constant. Depending upon the shape of the
PAM pulse, it is mainly classified into
(i) Natural PAM
(ii) Flat top PAM.
Natural PAM
Generation of Natural PAM
9. Flat top PAM
• The natural sampling is rarely employed in practice. Instead, the other practical
sampling technique flat top sampling is employed in practice.
• Here, the message signal x(t) is sampled instantaneously at the rate 𝑓𝑠 = 1 /𝑇𝑠 , and
the duration of each sample is lengthened to a duration ‘τ’.
Generation of Flat top PAM
10. Advantages of PAM:
Simplicity of generation and detection.
Disadvantages of PAM
(i) The effect of additive noise is maximum in PAM. The added noise cannot be
removed easily.
(ii) The transmission bandwidth required for a PAM signal is too large.
(iii)Due to the changes in amplitudes of PAM pulses, the transmitted power is not
constant.
11. Pulse Width Modulation (PWM)
• PWM is also called Pulse Duration Modulation (PDM) or Pulse Length Modulation
(PLM).
Definition :
The width of a constant amplitude carrier pulse is varied with respect to the
amplitude of the modulating signal".
PWM Waveforms
14. Detection of PWM signals:
•The output of the adder is clipped off at a threshold level to
generate a PAM signal at the output of the clipper.
• Finally, a low pass filter is used to recover the original
modulating signal from PAM signal .
16. Advantages of PWM
1. Effect of noise is very less.
2. Synchronization circuit is not necessary between transmitter and
receiver.
3. It is easy to recover the PWM signal from noise.
Disadvantages of PWM
1. Due to Variable pulse width, power of the pulse varies. Hence
transmission must be powerful to handle maximum width pulse.
2. Bandwidth requirement of PWM is larger than that of PAM to avoid
waveform distortion.
20. TIME DIVISION MULTIPLEXING (TDM)
Time-division multiplexing is a method of putting multiple data streams in a single
signal by separating the signal into many segments, each having a very short
duration. Each individual data stream is reassembled at the receiving end based on
timing.
Working Operations of TDM
Block diagram of TDM system
22. The types of TDM are
(i) Synchronous TDM
(ii) Asynchronous TDM
Synchronous TDM (STDM)
In synchronous TDM, each device is given same time slot to transmit the data over the
link, irrespective of the fact that the device has any data to transmit or not.
• Synchronous TDM requires that the total speed of various input lines should not exceed
the capacity of path.
• Each device places its data onto the link when its time slot arrives i.e. each device is
given the possession of line turn by turn.
23. Disadvantages of STDM The disadvantages of STDM are
(i). The channel capacity cannot be fully utilized. Some of the slots go empty in certain
frames.
(ii). The capacity of single communication line that is used to carry the various transmission
should be greater than the total speed of input lines.
Asynchronous TDM (ATDM)
In asynchronous TDM, the time slots are not predefined and the slots are allocated to any
of the device that has the data to send. The multiplexer scans the various input lines,
accepts the data from the lines that have data to send, fills the frame and then sends the
frame across the link. It is also known as statistical time division multiplexing.
Asynchronous TDM
25. T1 Carrier System
• In this system, 24 voice frequency signals, each sampled at 8000 samples per second,
encoded into an 8-bit word and transmitted along with one synchronizing bit per frame using
AMI code. T1 carrier system uses word interleaving.
Frame duration =18000sec=125𝜇sec Number of bits per frame =(24×8)+1=193
The PCM T1 frame using channel associated signaling
The 192 bits slots assigned to the encoded signal together with one extra timing
bit i.e., synchronizing bit which is necessary to provides synchronization
between channels, for a total of 193 bits. This is called a frame.
Hence, the transmission rate =193/125×10−6=1.544Mbps
26. T2 Carrier System
• In this system, 96 voice frequency signals are multiplexed. This is achieved by
multiplexing outputs of four T1 carriers and here 17 sync. bits are used.
Thus, the transmission rate =
(4×1.544)Mbps+(17×8)kbps =6.176Mbps+0.136Mbps =6.312Mbps
(3) T3 Carrier System
• In this system, 672 voice frequency signals are multiplexed. This is achieved by
multiplexing outputs of seven T2 carriers and here 69 sync. bits are used. Thus, the
transmission rate
=(7×6.312)Mbps+(69×8)kbps =44.184Mbps+0.552Mbps =44.736Mbps
𝑻𝟒 Carrier System
• In this system, 4032 voice frequency signals are multiplexed. This is achieved by
multiplexing outputs of six T3 carriers and here 720 sync. bits are used.
Thus, the transmission rate
=(6×44.736)Mbos+(720×8)kbps =268.416Mbps+5.760Mbps =274.176Mbps
T5 Carrier System
• In this system, 8064 voice frequency signals are multiplexed. This is achieved by
multiplexing outputs of two T4 carriers and here 1476 sync.bits are used.
Thus, the transmission rate
=(2×274.176)Mbps+(1476×8)kbps =548.352Mbps+11.808Mbps =560.16Mbps
27. Advantages
The advantages of TDM are
(i) Fully available channel bandwidth can be utilized for each channel.
(ii) Intermodulation distortion is absent.
(iii) TDM circuitry is not very complex.
(iv) The problem of crosstalk is not severe.
Disadvantages
The disadvantages of TDM are
(i) Synchronization is essential for proper operation.
(ii) Due to slow narrowband fading, all the TDM channels may get wiped out.
28. FREQUENCY DIVISION MULTIPLEXING (FDM)
𝐹𝐷𝑀 is a multiplexing technique that uses different frequencies to combine multiple
streams (signals) of data for transmission over a single communication medium. FDM
assigns a different frequency (sub channel) for every signal within the main channel
and then combines many modulated carrier frequencies for transmission.
FDM
29. Operation of FDM Systems
In this method of multiplexing, each message of maximum frequency 𝑓𝑚 is translated to a
different frequency spectrum by the use of the carriers. These messages are then combined
in an adder circuit.
• At the receiving end, a broad-band receiver receives this signal and passes it onto base
band receivers which receive signals corresponding to the respective base-band frequency.
At the output of these receivers, different signals are available. Here FDM operates in only
one direction.
Operations of FDM
30. Advantages
The advantages of FDM are
(i) A large number of signals (channels) can be transmitted simultaneously.
(ii) FDM does not need any synchronization between its transmitter and receiver for
proper operation.
(iii) Demodulation of FDM is also easy. (iv) Due to slow narrow band fading only a
single channel gets affected.
Disadvantages
The disadvantages of FDM are
(i) The communication channel must have a very large bandwidth.
(ii) Intermodulation distortion takes place.
(iii) Large number of modulators and filters are required.
(iv) FDM suffers from the problem of crosstalk.
(v) All the FDM channels get affected due to wideband fading.
Applications of FDM The applications of FDM are
(i) FDM is used for FM & AM radio broadcasting.
(ii) FDM is used in television broadcasting.
(iii) First generation cellular telephone also uses FDM.