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Low-Complexity SQR-Based Decoding Algorithm for Quasi-Orthogonal Space-Time Block Codes

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Executive Summary

In this paper, the authors propose a new decoding algorithm for Quasi-Orthogonal Space-Time Block Codes (QOSTBCs) which achieves near Maximum Likelihood (ML) performance while substantially reducing the decoding complexity. Space-Time Block-Codes (STBCs) from quasi-orthogonal designs achieve high symbol transmission rates compared to orthogonal STBCs. However, the Maximum Likelihood (ML) decoding of QOSTBCs is more complicated. Specifically, a joint detection of two complex symbols is required for a full-rate QOSTBC system with N = 4 transmit antennas, or 3/4- rate system with N = 8. For the full-rate system with N = 8, four complex symbols are jointly detected to obtain the ML solution.

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