Abstract
Improved decoding efficiency is achieved for differential unitary space-time modulation across a multiple-input multiple-output (MIMO) channel. The group nature of constellations used for signal transmission, and hence a minimised search space for maximum likelihood (ML) decoding are utilised to give this improvement. A procedure using lattice reduction for fast decoding across a multiple-input single-output (MISO) channel is generalised to a MIMO channel effectively, as a modification to a previous proposal, and used to generate the ML decoder search space. Further insight into the application of this algorithm is given. The decoding technique developed is shown to have very good error performance for reasonably sized MIMO channels.
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