Frequency-Domain Turbo Equalization and Multiuser Detection for DS-UWB Systems

TitleFrequency-Domain Turbo Equalization and Multiuser Detection for DS-UWB Systems
Publication TypeJournal Article
Year of Publication2008
AuthorsKaligineedi, P., and V. K. Bhargava
JournalWireless Communications, IEEE Transactions on
Pagination3280 -3284
Date Publishedsep.
Keywordsbit error rate, direct sequence-ultra wideband receiver, dispersive channels, DS-UWB systems, equalisers, error statistics, frequency-domain analysis, frequency-domain turbo equalization, interference suppression, intersymbol interference, least mean squares methods, minimum mean square error schemes, multiuser detection, phase shift keying, quaternary bi-orthogonal keying, single-user binary phase shift keying, soft interference cancelation, ultra wideband communication

One of the major challenges in direct sequence-ultra wideband (DS-UWB) receiver design is intersymbol interference (ISI). Several equalization schemes to eliminate ISI in DS-UWB systems have been proposed in the literature. It was shown that frequency-domain (FD) equalization techniques can offer better trade off between performance and complexity compared to time- domain equalization schemes for DS-UWB systems on highly dispersive channels. In this paper, we derive low-complexity FD minimum mean square error turbo equalization schemes for single-user binary phase shift keying (BPSK) and quaternary bi-orthogonal keying (4BOK) DS-UWB systems. For multiuser DS-UWB systems, we combine FD turbo equalization schemes with soft interference cancelation to obtain multiuser FD turbo detectors. The bit error rate performance gain due to turbo detection is shown to be significant, particularly for multiuser DS-UWB systems.


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