DocumentCode :
1129789
Title :
Distributed information-lossless space-time codes for amplify-and-forward TH-UWB systems
Author :
Abou-Rjeily, Chadi ; Fawaz, Wissam
Author_Institution :
Lebanese American Univ., Byblos
Volume :
12
Issue :
4
fYear :
2008
fDate :
4/1/2008 12:00:00 AM
Firstpage :
298
Lastpage :
300
Abstract :
In this paper, we extend the non-orthogonal amplify-and-forward (NAF) cooperative scheme to the context of impulse radio ultra-wideband (UWB) systems. In particular, we consider the problem of distributed space-time (ST) coding with 2D pulse position modulations (PPM) and joint pulse position and amplitude modulations (PPAM) and we propose the first known family of full-rate codes that are information-lossless with these constellations. Being totally-real, these codes are adapted to the carrier-less nature of the UWB transmissions and they outperform all previously known totally- real constructions with any number of relays. With binary PPM, they satisfy all the construction constraints of the optimal complex-valued codes proposed in [S. Yang and J.-C. Belfore, 2007] as well as the additional constraint of being real-valued.
Keywords :
pulse amplitude modulation; pulse position modulation; space-time codes; ultra wideband communication; 2D pulse position modulation; amplify-and-forward systems; impulse radio; pulse amplitude modulation; space-time codes; time hopping ultra wideband systems; Amplitude modulation; Digital relays; Fingers; Modulation coding; Protocols; Pulse amplifiers; Pulse modulation; Radio link; Space time codes; Ultra wideband technology;
fLanguage :
English
Journal_Title :
Communications Letters, IEEE
Publisher :
ieee
ISSN :
1089-7798
Type :
jour
DOI :
10.1109/LCOMM.2008.071945
Filename :
4489673
Link To Document :
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