Deterministic MIMO Channel Capacity
• CSI is Known to the Transmitter Side
• CSI is Not Available at the Transmitter Side
Channel Capacity of Random MIMO Channels
Deterministic MIMO Channel Capacity
• CSI is Known to the Transmitter Side
• CSI is Not Available at the Transmitter Side
Channel Capacity of Random MIMO Channels
These slides deal with the basic problem of channel equalization and exposes the issue related to it and shows how it can be balanced by the usage of effective and robust algorithms.
OFDM allows tightly packed carriers to convey information orthogonally and with high bandwidth efficiency
Objectives Description:
Concepts
Basic idea
Introduction to OFDM
Implementation
Advantages and Drawbacks.
FDMA
RF Basics & Getting Started Guide by AnarenAnaren, Inc.
This presentation serves as an overview of the parameters and considerations a designer would use to select a low-power wireless (LPRF) solution. It also highlights the devices and tools from the Anaren Integrated Radio (AIR) module product line and how they fit in a typical LPW design.
Bandwidth is a very critical parameter in any communication system.
trade-off between the system bandwidth and various other system parameters like latency, power consumption etc.
Higher bandwidth is vital in many applications
In order to increase the range of the operating frequency, the front end of the communication system (i.e. antenna) must be able to radiate efficiently over a wider bandwidth.
Commercial UWB systems require small low-cost antennas with larger bandwidth and non-dispersive behaviour
These slides deal with the basic problem of channel equalization and exposes the issue related to it and shows how it can be balanced by the usage of effective and robust algorithms.
OFDM allows tightly packed carriers to convey information orthogonally and with high bandwidth efficiency
Objectives Description:
Concepts
Basic idea
Introduction to OFDM
Implementation
Advantages and Drawbacks.
FDMA
RF Basics & Getting Started Guide by AnarenAnaren, Inc.
This presentation serves as an overview of the parameters and considerations a designer would use to select a low-power wireless (LPRF) solution. It also highlights the devices and tools from the Anaren Integrated Radio (AIR) module product line and how they fit in a typical LPW design.
Bandwidth is a very critical parameter in any communication system.
trade-off between the system bandwidth and various other system parameters like latency, power consumption etc.
Higher bandwidth is vital in many applications
In order to increase the range of the operating frequency, the front end of the communication system (i.e. antenna) must be able to radiate efficiently over a wider bandwidth.
Commercial UWB systems require small low-cost antennas with larger bandwidth and non-dispersive behaviour
Frequency Independent Antennas:
Wide band antennas
Frequency independent bandwidth in octave range
Broadband antennas
Frequency independent bandwidth in the range 40:1
Multiband antennas
Antenna resonate at different frequencies.
Bandwidth enhancement of compact microstrip rectangular antennas for UWB appl...TELKOMNIKA JOURNAL
In this paper design of microstrip patch antennas are presented for ultra wideband (UWB)
applications. The designed antennas have good matching input impedance in a wide frequency band
covering the UWB frequency band which is defined by the FCC. The proposed antennas consist of
rectangular patch which is fed by 50Ω microstrip line. These antennas are investigated and optimized by
using CST microwave studio, they are validated by using another electromagnetic solver HFSS.
The proposed antennas are designed and optimized taking into account the optimized of the ground by
using Defected Ground Structure (DGS) in order to improve the frequency band of microstrip antenna.
Hence, the impedance and surface current of the antenna structures are affected by DGS. As will be seen,
the operation bandwidth of the proposed antennas is from 3 to 15 GHz (return loss≤-10 dB), corresponding
to wide input impedance bandwidth (133.33%), with stable omnidirectional radiation patterns and important
gain. A good agreement has been obtained between simulation and measurement results in term of
bandwidth clearly show the validity of the proposed structures. These antennas are useful for UWB
applications, may be able to potentially minimize frequency interference from many wireless technologies
i.e WLAN, WiMAX. Details of the antennas have been investigated numerically and experimentally.
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Researchers have always tried to build a device capable of seeing people through walls. However, previous efforts to develop such a system have involved the use of expensive and bulky radar technology that uses a part of the electromagnetic spectrum only available to the military. Now a system is being developed by Dina Katabi and Fadel Adib, could give all of us the ability to spot people in different rooms using low-cost Wi-Fi technology. The device is low-power, portable and simple enough for anyone to use, to give people the ability to see through walls and closed doors. The system, called “Wi-Vi,” stands for "Wi-Fi" and "vision." is based on a concept similar to radar and sonar imaging. But in contrast to radar and sonar, it transmits a low-power Wi-Fi signal and uses its reflections to track moving humans. It can do so even if the humans are in closed rooms or hiding behind a wall.
Simple definition for Wi-Vi is, as a Wi-Fi signal is transmitted at a wall, a portion of the signal penetrates through it, reflecting off any humans on the other side. However, only a tiny fraction of the signal makes it through to the other room, with the rest being reflected by the wall, or by other objects. Wi-Vi cancels out all these other reflections, and keeps only those from the moving human body. Previous work demonstrated that the subtle reflections of wireless inter signals bouncing off a human could be used to track that person's movements, but those previous experiments either required that a wireless router was already in the room of the person being tracked. Wi-Fi signals and recent advances in MIMO communications are used to build a device that can capture the motion of humans behind a wall and in closed rooms. Law enforcement personnel can use the device to avoid walking into an ambush, and minimize casualties in standoffs and hostage situations. Emergency responders can use it to see through rubble and collapsed structures. Ordinary users can leverage the device for gaming, intrusion detection, privacy-enhanced monitoring of children and elderly, or personal security when stepping into dark alleys and unknown places.
The concept underlying seeing through opaque obstacles is similar to radar and sonar imaging. Specifically, when faced with a non-metallic wall, a fraction of the RF signal would traverse the wall, reflect off objects and humans, and come back imprinted with a signature of what is inside a closed room. By capturing these reflections, we can image objects behind a wall.
Wi-Vi is a see-through-wall technology that is low-bandwidth, low-power, compact, and accessible to non-military entities. Wi-Vi is a see-through-wall device that employs Wi-Fi signals in the 2.4 GHz ISM band.
18. This drawing is representative of a light-recon vehicle used in forward areas by German forces during WW II.
19. NVIS HF radio systems played a key role for the Allied Forces during the D-Day invasion of Normandy in 1944.These techniques were incorporated into Signal support planning by Dr. H. H. Beverage.
20. USMC test proves NVIS highly reliable. 20 watts = 100% effectiveness in 200 mile radius
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