Reduced Complexity ML Decoding of Rate 6/8 and Rate 1 Linear Complex Space-Time Codes for Up to 8 Transmit Antennas with Phase Feedback
01 August 2005
It is shown that single symbol ML (maximum likelihood) decoding for chosen rate 6/8 linear complex space-time codes for up to 8 transmit antennas is possible in the presence of a real phase feedback. The performance of the code is the same as that of an ideal code for which the sufficient statistic of the channel is its Frobenius norm. For rate 1 codes for up to 8 antennas, a two-phase feedback enables a symbol to see the interference from only one symbol instead of three thereby reducing the complexity of ML decoding. Quantization of the feedback is also considered.