DocumentCode :
777673
Title :
Noncoherent Ultra-Wideband (De)Modulation
Author :
Yang, Liuqing ; Giannakis, Georgios B. ; Swami, Ananthram
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL
Volume :
55
Issue :
4
fYear :
2007
fDate :
4/1/2007 12:00:00 AM
Firstpage :
810
Lastpage :
819
Abstract :
Ultra-wideband (UWB) radios have received increasing attention recently for their potential to overlay legacy systems, their low-power consumption and low-complexity implementation. Because of the pulsed or duty-cycled nature of the ultra-short transmitted waveforms, timing synchronization and channel estimation pose major, and often conflicting, challenges and requirements. In order to address (or in fact bypass) both tasks, we design and test noncoherent UWB (de)modulation schemes, which remain operational even without timing and channel information. Relying on integrate-and-dump operations of what we term "dirty templates," we first derive a maximum likelihood (ML) optimal noncoherent UWB demodulator. We further establish a conditional ML demodulator with lower complexity. Analysis and simulations show that both can also be applied after (possibly imperfect) timing acquisition. Under the assumption of perfect timing, our noncoherent UWB scheme reduces to a differential UWB system. Our approach can also be adapted to a transmitted reference (TR) UWB system. We show that the resultant robust-to-timing TR (RTTR) approach considerably improves performance of the original TR system in the presence of timing offsets or residual timing acquisition errors
Keywords :
channel estimation; demodulation; maximum likelihood estimation; synchronisation; ultra wideband communication; UWB radios; channel estimation; dirty templates; integrate-and-dump operations; maximum likelihood demodulator; noncoherent ultra-wideband demodulation; resultant robust-to-timing; timing synchronization; ultra-short transmitted waveforms; Analytical models; Channel estimation; Demodulation; Government; Laboratories; Maximum likelihood detection; Maximum likelihood estimation; Testing; Timing; Ultra wideband technology; Channel estimation; differential modulation; noncoherent detection; timing synchronization; transmitted reference (TR); ultra-wideband (UWB);
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOMM.2007.894116
Filename :
4155137
Link To Document :
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