Immune-Clonal-Selection-Based Minimum-BER Detection in Multicode STBC-MIMO Systems

Multicode STBC-MIMO systems can provide flexibility in the diversity-multiplexing gain tradeoff. It is worth noting that multicode operation can provide additional degrees of freedom in the code domain to achieve high data rates. Meanwhile an immune-clonal-selection-based minimum-BER detection algorithm (ICS-MBER) is proposed for the multicode STBC-MIMO systems. The main idea is to directly minimize the BER by employing an immune clonal selection algorithm on the estimated BER function in order to adaptively adjust the weights of the detector. Simulation results show the proposed approach can achieve significantly superior performance, which is very close to that of the optimal maximum-likelihood sequence estimation (MLSE) detector.