We consider the problem of designing high rate space–time block codes in multipath fading channels. For this, both minimizing the effect of the self-interference induced by the code itself, and mitigating the inter-symbol-interference induced by the channel have to be addressed. We translate the problem into an equivalent problem of designing a constrained code in a single-path channel with more antennas, and argue that design criteria derived in single-path apply when optimizing this constrained code. Here we concentrate on an analytic measure pertinent to mutual information maximization and BER-performance optimization. The design program is successfully applied to rate one linear space–time transmissions from four transmit antennas. A family of discrete permutations of the transmitted sequences are considered. Performance is optimized within this family, and the results are seen to effect directly both mutual information and error performance.
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Tirkkonen, O., Iraji, S. & Hottinen, A. Design Criteria for Non-Orthogonal Space–Time Block Codes in Multipath Channels. Int J Wireless Inf Networks 13, 341–355 (2006). https://doi.org/10.1007/s10776-006-0043-0
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DOI: https://doi.org/10.1007/s10776-006-0043-0