Multiuser Interference Modeling and Suppression for a Multichannel Differential IR-UWB System

Authors

Christoph Steiner and Klaus Witrisal

Reference

IEEE International Conference on Ultra-Wideband, ICU 2005, Zurich, Switzerland, Sept. 2005.

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Abstract

In a frame-differential, transmitted-reference (TR), impulse radio (IR) UWB system, operating in a dispersive multipath propagation and multi-access environment, the performance is, besides to noise, determined by the amount of inter-symbol interference (ISI) and multi-access interference (MAI). In this paper a multiuser multichannel equivalent system model accounting for ISI and MAI is derived to develop advanced detectors for these IR-UWB systems. A low complexity LMS algorithm is used to calculate optimal weighting coefficients for the fractionallyspaced, multichannel sample vectors acquired from the analog receiver front-end, to obtain an optimized decision variable. The achieved results are compared to the conventional single-channel system and to the results of a maximum likelihood sequence detection (MLSD) multiuser detection algorithm.

Keywords

Ultra-Wideband, frame-differential, transmitted-reference, autocorrelation receiver, multiuser modeling, multiuser detection, multichannel


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