Spatial multiplexing in pulse based ultrawideband communications

The performance of various spatial multiplexing (SM) schemes in ultrawideband pulse based (UWB) binary antipodal modulations is investigated. It is shown that the favourable spatial decorrelation properties of UWB signals allow to decouple spatial channels very effectively, and to reach excellent performance under moderate complexity at the receiver. The work presented here considers several detection methods such as zero forcing (ZF), minimum mean square error (MMSE) and maximum likelihood (ML) in order to cope with inter channel interference (ICI). Inter symbol interference (ISI) is investigated as well, and is shown to be moderate unless for extreme rates. In addition partial ISI suppression by iterative decision-aided interference cancellation over a block of symbols is investigated in order to further increase the data rate. Simulations based on a double directional channel model exemplify these results.

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