Terrestrial microwave communication uses high-frequency radio waves to transmit data between two fixed points using antennas with a direct line-of-sight. It operates between 2-60 GHz and requires repeaters for long distances. Key advantages are fast deployment, flexibility, and ability to link across obstacles. Design considerations include ensuring the Fresnel zone around the beam path is clear of obstacles to minimize signal diffraction and interference. Link budgets calculate total gains and losses to determine maximum transmission distances.
Possible media for communication
Introduction to Communication Media
Introduction to Microwave communication
Manufacturers of Microwave
Why Microwave?
Characteristics of microwave
Types of Microwave communication
Types of Microwave Links
Requirements for the microwave communication
What is LOS?
Wave Propagation in the atmosphere
Multi path Propagation
LOS Purpose & requirements
Limitations of Line of Sight Systems
Design of Line of Sight Microwave Links
K- factor
Variations of the ray curvature as a function of k
Fresnel zone
Obstacles & Loses
Knife Edge Obstacles
Smooth Spherical Earth Obstacles
Path Loss
Other losses
Why vertical polarization favorable at high freq
Antenna type & Gain
RECEIVER SENSITIVITY, FADE MARGIN AND SIGNAL TO NOISE RATIO
Fading Margin
Reliability
Its exploring the technique for spatially successive interference cancellation and superposition of transmission for upcoming radio communication 5G technology.
NOTE: The slides contain the visual effects. So for complete information download the presentation and view it in slideshow mode.
Description of Non-orthogonal Multiple access in 5G networks Detailed discussion on downlink NOMA scenario and future challenges and trends.
Possible media for communication
Introduction to Communication Media
Introduction to Microwave communication
Manufacturers of Microwave
Why Microwave?
Characteristics of microwave
Types of Microwave communication
Types of Microwave Links
Requirements for the microwave communication
What is LOS?
Wave Propagation in the atmosphere
Multi path Propagation
LOS Purpose & requirements
Limitations of Line of Sight Systems
Design of Line of Sight Microwave Links
K- factor
Variations of the ray curvature as a function of k
Fresnel zone
Obstacles & Loses
Knife Edge Obstacles
Smooth Spherical Earth Obstacles
Path Loss
Other losses
Why vertical polarization favorable at high freq
Antenna type & Gain
RECEIVER SENSITIVITY, FADE MARGIN AND SIGNAL TO NOISE RATIO
Fading Margin
Reliability
Its exploring the technique for spatially successive interference cancellation and superposition of transmission for upcoming radio communication 5G technology.
NOTE: The slides contain the visual effects. So for complete information download the presentation and view it in slideshow mode.
Description of Non-orthogonal Multiple access in 5G networks Detailed discussion on downlink NOMA scenario and future challenges and trends.
Signals travels from the transmitter (object) to the receiver (your eye) along this straight line. This type of travel is called line of sight propagation.
Radio waves with frequencies greater than about 2MHz have line of sight propagation characteristic.
If the earth were flat, everything would be fine with this type of propagation.
This file consists of the following things related to line of sight propagation
INTRODUCTION
LINE OF SIGHT PROPAGATION
NON LINE OF SIGHT PROPAGATION
DISTANCE B/W TWO ANTENNA
RELATIONSHIP B/W HEIGHT OF ANTENNA AND RADIUS OF EARTH
LOS WIRELESS TRANSMISSION IMPAIRMENTS
APPLICATION OF LINE OF SIGHT PROPAGATION
LIMITATION OF LINE OF SIGHT PROPAGATION
REFERENCES
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
3. What is Terrestrial Microwave ?
transmission systems consisting of at least two radio transmitter/receivers
(transceivers) connected to high gain antennas (directional antennas
which concentrate electromagnetic or radio wave energy in narrow beams)
focused in pairs on each other
The operation is point-to-point; communications are established between two
and only two antennas with line-of-sight visibility
Operating frequencies range for microwave are 2Ghz to 60Ghz which limits all
communications to line-of-sight
Repeaters need to be used for long distance communication
uses a parabolic dish to communicate using electromagentic waves onto
receiver antenna
5. Why Microwave ? (Advantages)
Fast Deployement possible
Felxiblity
Link across mountains and rivers are economically feasible
Low MTTR(mean time to recover)
Less affected by natural calamities
Less prone to accidental damage
6. Characteristics of Microwave
Generally used frequency band is 3Ghz to 30Ghz
Typically used for point to point communication
Microwaves travel in straight lines & thus can be narrowly focused thereby
allowing other microwave communications using same frequencies with
almost no interference
Microwaves cannot pass through big obstacles viz. buildings, mountains
7. Types of Microwave Links and
polarization
Long haul (2Ghz-10Ghz)40km-80km
Medium Haul (11-20Ghz) 20km-40km
Short Haul (23-58Ghz) Few Kms
Polarization Types:
Vertical Polarization: less prone to rain and environmental factors
Horizontal Polarization: very much used to avoid interference but are more
prone to rain.
8. Requirements for microwave
communication
required a clear line of sight(LOS) between points
Parameters design like power, frequency, Rx level etc
Antenna height calculation for clear LOS
Fresnel ellipsoids and their clearance criteria concept is used to calculate
radio LOS
Fresenel zone must be clear of all obstacle
9. What is LOS ?
Line of Sight
Line of sight (LoS) is a type of propagation that can transmit and receive data
only where transmit and receive stations are in view of each other without any
sort of an obstacle between them
10.
11. LOS purpose and requirement
Purpose
Establish LOS links
Feasibility Studies
Up gradation of existing links
Requirement of LOS Links
Site location
Planned antenna height
direction of the other end of link
Output
LOS/NLOS
13. Limitation of LOS
Curvature of earth
Actual obstruction en-route in each hop
RF effect of fresnel zone
path loss
transmitter power
antenna gain
transmission line loss
frequency of operation
received power
receiver threshold
signal to noise ratio
Fade margin required
Desired reliability of link
14. Fresnel Zone
• Area of constructive and destructive interference created when EM waves
propagation in free space is reflected(multipath) or diffracted as waves
intersect obstacles
• Fresnel Zone are specific employing ordinal numbers that corresponds to the
number of half wavelength multiples that represent the difference on radio
wave propagation path from direct path.
• Fresnel zone must be clean of all obstacles
• Typically first Fresnel zone (n=1) is used to determine obstruction loss
• Direct path between transmitter and the receiver needs a clearance above
ground of atlest 60% of radius of first Fresnel zone to achieve free space
propagation condition
• Earth radius factor K compensate the refraction in the atmosphere
15.
16. Clearence is defined as criterion to ensure sufficient antenna height so that in
the worst case of refraction(K is minimum), the receiver antenna is not
placed in the diffraction region
Effe. Earth radius=K^True earth’s radius
True earth radius=6371km
K=4/3=1.33, standard atmosphere with normal refracted path
17. Clearance critera
Clearance of 60% or greater at minimum K suggested for central path
Clearance of 100% at K=4/3
Incase of space diversity, the antenna can have 60% clearance at K=4/3 plus
allowance for tree growth, building (usually 3m)
18. Microwave Link design process
• Loss/attenuation calculation
• Fading and fade margin calculation
• Frequency planning and interference
• Quality and availability calculation
19. MW link design process is iterative and may go through many redesign phase
before the required quality and availability are achieved
1. Frequency planning(Interference analysis)
2. Link Budget
Propagation loss
Branching loss
Other loss
3. Fading prediction
Rain attenuation
Diffraction-refraction loss
Multipath propagation
4.Quality and Availability
20. Loss/Attenuation Calculation
1. Propagation Loss: due to earth’s atmosphere
2.Branching Loss: carries from network used to deliver the trx/rx output
to/from antenna
3. Other Loss: Unpredicatbel and sporadic in character like fog, moving
objects crossing path profile, poor equipment installation, less then perfect
antenna alignment
21.
22. Propagation Loss
Free Space Loss: when the transmitter and receiver have a clear unobstructed
loss
FSL is the loss in the signal strength of an EM wave that would be result from
LOS path through free space (usually air), with no obstruction nearby to cause
reflection or diffraction. It doesn’t include Tx,Rx antenna, gain and others
loss associated with network imperfection.
23. Vegetation Attenuation
Provision should be taken for 5 years of vegetable growth.
Obstacle Loss: also called diffraction loss or diffraction attenuation
.one method of calculation is based on knife edge approximation
.having an obstacle free 60% of Fresnel gives 0db loss
24. Gas Absorbtion
.primary due to water vapour and oxygen on atmosphere in radius relay region
.absorption peak are located around 23Ghz for water molecule 50-70Ghz for
oxygen molecule
.Attenuation depends as fog, temperature and absolute or relative humidity of
atmosphere.
Attenuation due to precipitation:
Rain attenuation increses with frequency and become major contribution in
frequency band above 10Ghz
Horizontal polarization gives more rain attenuation than vertical polarization
25. Ground Reflection:
.Reflection give rise to multiple propagation
.Direct ray at receiver may interfered with the ground reflected ray and the
reflection loss can be significant
26. Link Budget
Calculation involving the gain and loss factor associated with the antenna,
transmission line, propagation environment to determine maximum distance
at which a transmitter and receiver can successfully operate