Receive Antenna Selection without CSI for Linear Detection

Multiple-input multiple-output (MIMO) receive antenna selection without channel state information (CSI) for linear detection is proposed in the presence of unknown interferences. This antenna selection technique is implemented based on training sample sequence by minimizing the Least Squares (LS) estimation error, which avoids the channel estimation. Since the high complexity of the exhaustive search, a QR decomposition-based fast selection algorithm is presented by using greedy algorithm. Simulations show that the exhaustive selection can retain the diversity benefit of the full complexity system using all the receive antennas and that the fast selection algorithm obtains most of performance of the exhaustive selection system with linear complexity.