Zero-forcing equalizer with group successive interference cancellation for space-time modulated codes

An equalizer, called group successive interference cancellation zero-forcing equalizer (GSIC-ZFE), for space-time modulated codes (STMC) is proposed. Base on the structure of STMC, the proposed equalizer provides ISI-free communications over the ISI MIMO channels without a long guard period. The GSIC-ZFE is based on linear FIR zero-forcing equalizer (FIR-ZFE) and the successive interference cancellation (SIC). In each iteration, a group of elements in the source signal vector are detected and canceled. The performance of FIR-ZFE designed in each iteration can therefore be enhanced. At the same time, the error propagation problem associated with SIC is reduced by limiting the cancellation process to be independent in each time slot. We further considered the SIC operated in a group-by-group basis to reduce the computational complexity of the GSIC-ZFE. Simulation results presented in the paper has shown substantial gain can be obtained by GSIC-ZFE.