An iterative MLD scheme for MIMO-STBC system with directional interference

This paper presents an iterative Maximum Likelihood Decoding (MLD) scheme for Multiple Input Multiple Output (MIMO) systems using Space-Time Block Codes (STBC) in strong directional interference scenario. The proposed scheme avoids matrix-inversion computation needed in ordinary reception schemes and estimates noise-subspace-projected channel matrix instead of real channel matrix to perform decoding through noise subspace projection; reduces bad effect of channel estimation error on decoding performance, realizes MLD of STBC block by block instead of frame by frame and greatly reducing searching calculations by decoding iteratively. Simulation results are given to verify performance of the proposed scheme. Compared with other suppression schemes, the proposed scheme has better SER performance and is less sensitive to the length of pilot symbols.