Soft Decision Decoding of the Orthogonal Complex MIMO Codes for Three and Four Transmit Antennas

Details Soft Decision Decoding of the Orthogonal Complex MIMO Codes for Three and Four Transmit Antennas Soft Decision Decoding of the Orthogonal Complex MIMO Codes for Three and Four Transmit Antennas

2010-01-11

arxiv.org/abs/1001.1603v1

Computer Science

Information Theory

12 pages, 9 figures, submitted to IEEE Transactions on Information Theory 9 Dec. 2009

Scientific paper

Orthogonality is a much desired property for MIMO coding. It enables symbol-wise decoding, where the errors in other symbol estimates do not affect the result, thus providing an optimality that is worth pursuing. Another beneficial property is a low complexity soft decision decoder, which for orthogonal complex MIMO codes is known for two transmit (Tx) antennas i.e. for the Alamouti code. We propose novel soft decision decoders for the orthogonal complex MIMO codes on three and four Tx antennas and extend the old result of maximal ratio combining (MRC) to cover all orthogonal codes up to four Tx antennas. As a rule, a sophisticated transmission scheme encompasses forward error correction (FEC) coding, and its performance is measured at the FEC decoder instead of at the MIMO decoder. We introduce the receiver structure that delivers the MIMO decoder's soft decisions to the demodulator, which in turn cranks out the logarithm of likelihood ratio (LLR) of each bit and delivers them to the FEC decoder. This makes a significant improvement on the receiver, where a maximum likelihood (ML) MIMO decoder makes hard decisions at a too early stage. Further, the additional gain is achieved with stunningly low complexity.

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