Ultra Wideband Systems: Technologies and Applications (Communications Engineering (Paperback))
Chapter 3 Interference and Coexistence. Chapter 4 UWB Antennas.
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Introduction to Ultra Wide Band Communication Systems offers a comprehensive view of UWB system design, that spans propagation, antennas, receive and transmitter implementations, standards and regulations, interference issues, simulation techniques, modulation and multiple access, network issues, and applications. This book encompasses all areas of design and implementation of UWB systems crucial to their successful testing and deployment.
UWB offers unique capabilities, such as extremely high data rates, and building partitions and ground penetrating transmission. The standardization effort has recently come to fruition with the creation of a new, regulated communication standard.
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However, a new standard brings along with it new regulations and equipment; and the design of UWB systems is very different than traditional communication systems. The current general reference books for design of communication systems are insufficient, and in some cases could be misleading to a UWB designer. Furthermore, there is a tremendous need to unify the diverse concepts and fields of study embedded in the design of UWB systems. Read more Read less.
Topics include UWB fundamentals: Prentice Hall; 1 edition April 15, Language: Be the first to review this item Would you like to tell us about a lower price? Related Video Shorts 0 Upload your video. Customer reviews There are no customer reviews yet. Share your thoughts with other customers. Write a customer review. However, both systems are susceptible to intersymbol interference. UWB transmissions transmit information by generating radio energy at specific time intervals and occupying a large bandwidth, thus enabling pulse-position or time modulation.
UWB pulses can be sent sporadically at relatively low pulse rates to support time or position modulation, but can also be sent at rates up to the inverse of the UWB pulse bandwidth. Pulse-UWB systems have been demonstrated at channel pulse rates in excess of 1. A valuable aspect of UWB technology is the ability for a UWB radio system to determine the "time of flight" of the transmission at various frequencies. This helps overcome multipath propagation , as at least some of the frequencies have a line-of-sight trajectory.rtc.stagcms.com/unmanned-aerial-vehicles-uavprogram-plan.php
With a cooperative symmetric two-way metering technique, distances can be measured to high resolution and accuracy by compensating for local clock drift and stochastic inaccuracy. However, there is still multipath propagation and inter-pulse interference to fast-pulse systems, which must be mitigated by coding techniques. One performance measure of a radio in applications such as communication, locating, tracking and radar is the channel capacity for a given bandwidth and signaling format.
Channel capacity is the theoretical maximum possible number of bits per second of information that a system can convey through one or more links in an area. According to the Shannon—Hartley theorem , the channel capacity of a properly encoded signal is proportional to the bandwidth of the channel and the logarithm of the signal-to-noise ratio SNR assuming the noise is additive white Gaussian noise.
Thus, channel capacity increases linearly by increasing the channel's bandwidth to the maximum value available, or in a fixed-channel bandwidth by increasing the signal power exponentially. By virtue of the large bandwidths inherent in UWB systems, large channel capacities could be achieved in principle given sufficient SNR without invoking higher-order modulations requiring a very high SNR.
Ideally, the receiver signal detector should match the transmitted signal in bandwidth, signal shape and time. A mismatch results in loss of margin for the UWB radio link.
Ultra Wideband Systems: Technologies and Applications - Roberto Ajello, Anuj Batra - Google Книги
Channelization sharing the channel with other links is a complex issue, subject to many variables. Two UWB links may share the same spectrum by using orthogonal time-hopping codes for pulse-position time-modulated systems, or orthogonal pulses and orthogonal codes for fast-pulse-based systems. Forward error correction — used in high-data-rate UWB pulse systems — can provide channel performance approaching the Shannon limit.
Multipath interference distortion of a signal because it takes many different paths to the receiver with various phase shift and various polarisation shift is a problem in narrowband technology.
It also affects UWB transmissions, but according to the Shannon-Hartley theorem and the variety of geometries applying to various frequencies the ability to compensate is enhanced. Multipath causes fading, and wave interference is destructive. Some UWB systems use "rake" receiver techniques to recover multipath-generated copies of the original pulse to improve a receiver's performance. Other UWB systems use channel-equalization techniques to achieve the same purpose.