Journal ArticleDOI
Performance of ultrawideband SSMA using time hopping and M-ary PPM
TLDR
A numerical example is given that shows that impulse radio modulation is theoretically able to provide multiple-access communications with a combined transmission capacity of hundreds of megabits per second at bit error rates in the range 10/sup -4/ to 10/Sup -7/ using receivers of moderate complexity.Abstract:
Wireless spread spectrum multiple access (SSMA) using time hopping and block waveform encoded (M-ary) pulse position modulated (PPM) signals is analyzed. For different M-ary PPM signal designs, the multiple-access performance in free-space propagation renditions is analyzed in terms of the number of users supported by the system for a given bit error rate, signal-to-noise ratio, bit transmission rate, and number of signals in the M-ary set. The processing gain and number of simultaneous users are described in terms of system parameters. Tradeoffs between performance and receiver complexity are discussed. Upper bounds on both the maximum number of users and the total combined bit transmission rate are investigated. This analysis is applied to ultrawideband impulse radio modulation. In this modulation, the communications waveforms are practically realized using subnanosecond impulse technology. A numerical example is given that shows that impulse radio modulation is theoretically able to provide multiple-access communications with a combined transmission capacity of hundreds of megabits per second at bit error rates in the range 10/sup -4/ to 10/sup -7/ using receivers of moderate complexity.read more
Citations
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Journal ArticleDOI
Ultrawideband propagation channels-theory, measurement, and modeling
TL;DR: It is demonstrated how the frequency selectivity of propagation processes causes fundamental differences between UWB channels and "conventional" (narrowband) channels.
Journal ArticleDOI
Performance of ultra-wideband communications with suboptimal receivers in multipath channels
J.D. Choi,Wayne E. Stark +1 more
TL;DR: The performance of a single-user ultra-wideband communication system employing binary block-coded pulse-position modulation and suboptimal receivers in multipath channels is considered and numerical results for several cases are obtained which illustrate the tradeoff between performance and receiver complexity.
Journal ArticleDOI
Ultrawideband radio design: the promise of high-speed, short-range wireless connectivity
TL;DR: Current developments in UWB system design concepts that are oriented to high-speed applications are outlined and some of the design tradeoffs involved are described.
Journal ArticleDOI
Channel estimation for ultra-wideband communications
TL;DR: Channel estimation in ultra-wideband communications operating in a multipath environment and in the presence of multiaccess interference is dealt with and it is shown that the DA method has an edge over the NDA in that it can handle a larger number of users for a fixed degradation.
Journal ArticleDOI
Ultra-Wideband Wireless Communications
TL;DR: An overview of UWB communications is provided, the previous research results are summarized, and further research issues that need to be tackled are identified.
References
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Journal ArticleDOI
A mathematical theory of communication
TL;DR: This final installment of the paper considers the case where the signals or the messages or both are continuously variable, in contrast with the discrete nature assumed until now.
Journal ArticleDOI
Impulse radio: how it works
Moe Z. Win,Robert A. Scholtz +1 more
TL;DR: The characteristics of impulse radio using a modulation format that can be supported by currently available impulse signal technology are described and analytical estimates of its multiple- access capability under ideal multiple-access channel conditions are given.
Proceedings ArticleDOI
Multiple access with time-hopping impulse modulation
TL;DR: In this paper, a time-hopping modulation format employing impulse signal technology has several features which may make it attractive for multiple-access communications and an estimate of the multiple access capability of a communication system employing this format under ideal propagation conditions is presented.
Book
Probability, Random Processes, and Estimation Theory for Engineers
Henry Stark,John W. Woods +1 more
TL;DR: This chapter discusses the foundations of estimation and decision theory, and some examples show how the model derived recently in [Bouchut-Boyaval, M3AS (23) 2013] can be modified for flows on rugous topographies.