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

Authors:
P. Kaligineedi;V. Bhargava
Affiliations:
Dept. of Electr. & Comput. Eng., British Columbia Univ., Vancouver, BC;-
Venue:
IEEE Transactions on Wireless Communications
Year:
2008

Citing 0
Cited 2

Iterative frequency-domain channel estimation and equalization for ultra-wideband systems with short cyclic prefix

EURASIP Journal on Advances in Signal Processing - Special issue on advanced equalization techniques for wireless communications
A hybrid ant colony optimization algorithm for optimal multiuser detection in DS-UWB system

Expert Systems with Applications: An International Journal

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Abstract

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.