On turbo equalization of interleaved space-time codes

Space-time coding over frequency selective time-varying fading channels is considered. The approach is based on deploying bit/symbol interleaved space-time codes. Decoding is based on the iterative concatenation of a soft-in soft-out MIMO equalizer with a soft-in soft-out decoder. The equalizer structure comprises a bank of matched filters followed by a maximum a posteriori processor with an appropriate metric. It does not require multiple receive antennas. Methods to reduce its complexity are devised. Finally, performance results are shown for ST bit-interleaved convolutional codes designed for the EDGE air interface with two transmit-single receive antennas.