Impulse shortening and equalization of frequency-selective MIMO channels with respect to layered space-time architectures

Multiple antenna systems may be used in fading environments to exploit an enormous capacity advantage. Most of the coding schemes and transmission architectures published so far have been restricted to non-frequency-selective fading channels. For adopting these narrowband schemes to frequency-selective environments, appropriate algorithms to mitigate the influence of inter-layer interference and intersymbol interference have to be investigated. In this paper, we give a survey of existing algorithms to shorten the effective channel impulse response and to equalize frequency-selective MIMO channels. In addition, a successive detection algorithm similar to V-BLAST is viewed and a new improved iterative algorithm is proposed. This algorithm is called Frequency-Selective Backward Iterative cancellation and achieves an enlarged detection diversity. The main object of this investigation is to represent the different systematics and to compare these schemes with respect to simulated bit error rates. (C) 2003 Elsevier Science B.V. All rights reserved.