Combination of turbo equalisation and Turbo Trellis-coded modulation with low complexity

A novel low-complexity scheme of Turbo Trellis-coded modulation (TCM) iterative equalisation and decoding is presented, which serially concatenates a soft-input-soft-output equaliser and symbol-by-symbol Turbo TCM (TTCM) decoder through an iterative process in order to realise iterative equalisation and decoding process. This scheme can not only improve the bandwidth efficiency, but also reduce the intersymbol interference. The equaliser with maximum a posteriori is replaced with linear one based on minimum mean-square error at the receiver so that the complexity of the system can be reduced greatly. Computer simulation results show that the novel low-complexity receiver on fading channels can achieve comparable performance with TTCM on Gaussian channels.