Rotated and Scaled Alamouti Coding

Details Rotated and Scaled Alamouti Coding Rotated and Scaled Alamouti Coding

2008-02-05

arxiv.org/abs/0802.0580v1

Computer Science

Information Theory

Submitted to ISIT 2008

Scientific paper

Repetition-based retransmission is used in Alamouti-modulation [1998] for $2\times 2$ MIMO systems. We propose to use instead of ordinary repetition so-called "scaled repetition" together with rotation. It is shown that the rotated and scaled Alamouti code has a hard-decision performance which is only slightly worse than that of the Golden code [2005], the best known $2\times 2$ space-time code. Decoding the Golden code requires an exhaustive search over all codewords, while our rotated and scaled Alamouti code can be decoded with an acceptable complexity however.

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