For multiple input multiple output (MIMO) system using space-time block codes (STBC) with directional interferences

especially with strong directional interferences in military communication scenario

effective interference suppression is necessary to avoid system performance degradation.An iterative maximum-likelihood decoding (MLD) scheme is presented.The proposed scheme estimates equivalent channel matrix instead of real channel matrix to perform interference suppression and decoding through noise subspace projection;reduces bad effect of channel estimation error on decoding performance

and realizes MLD of STBC block by block instead of frame by frame with less searching calculations by accumulating the increment of cost function iteratively.Simulation results show that the proposed scheme is valid to suppress interference and less sensitive to the length of pilot symbols

which is more flexible in practical applications.