Design Criteria for Non-Orthogonal Space–Time Block Codes in Multipath Channels |
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Authors: | Olav Tirkkonen Sassan Iraji Ari Hottinen |
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Institution: | (1) , 00720 Helsinki, Finland;(2) Nokia Research Center, 407, FIN-00045 Helsinki, Finland |
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Abstract: | 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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Keywords: | Diversity multipath channels multiple antennas space– time block codes time-reversed codes |
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