Subspace-Based Blind Multi-User Detection for TH-UWB Systems in Multi-Path Channels

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Executive Summary

A subspace-based blind adaptive linear Minimum Mean Square Error (MMSE) detector has been proposed for multi-user detection in a direct sequence Code-Division Multiple-Access (CDMA) system even when multi-path channels are unknown. In this paper, the applicability of the subspace-based blind adaptive algorithm in multiple access Ultra-WideBand (UWB) systems is investigated. The problem of blind demodulation of multi-user information symbols in a high-rate UWB network in the presence of both Multiple Access Interference (MAI) and Inter-Symbol Interference (ISI) is also considered. Moreover, the Rake receiver is adopted to collect multi-path gains. The performance of the subspace-based blind techniques is shown under time-variant UWB multi-path channels.

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