MAP decoding algorithm with sliding window for UST-symbol based turbo code

Recently, a novel scheme employing unitary space-time symbol based turbo code (USTSBTC) has been proposed that can greatly reduce the system complexity while maintaining a fairly well performance compared with the bit wise processing version. However, as we know, an intrinsic pitfall of MAP decoding algorithm for turbo code is its too large amount storage requirement. We propose a sliding window for MAP decoding algorithm fitting for unitary space-time symbol based nonbinary turbo code for wireless communication systems with multiple antennas over extremely fast Rayleigh block fading channels, where no channel state information (CSI) is available. Simulation results show that it can greatly reduce the time delay of the system with only a limited performance loss.