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Efficient Decoding Algorithm for Rate-2, $2{\times}2$ Space-Time Codes  

Kim, Jeong-Chang (Pohang University of Science and Technology)
Cheun, Kyung-Whoon (Pohang University of Science and Technology)
Publication Information
Abstract
Recently, a rate-2, $2{\times}2$ space-time code with simple ML decoding has been designed. Though the simple ML decoding algorithm does reduce the ML decoding complexity, there is still need for improvement. In this paper, we propose an efficient decoding algorithm for the rate-2, $2{\times}2$ space-time code using interference cancellation techniques with performance virtually identical to that of ML decoding. Also, the decoding complexity of the proposed algorithm is significantly reduced compared to the conventional simple ML decoding, especially for large modulation orders.
Keywords
Decoding complexity; interference cancellation; maximum-likelihood (ML) decoding; rate-2 space-time codes (STC);
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