Iterative Receiver for MIMO Systems With Hybrid Detector

For multiple antenna systems, we consider the hybrid iterative detection of the maximum a posteriori probability (MAP) detection and the linear detection such as the minimum mean squared error (MMSE) filtering with soft cancellation. We devise methods to obtain both the lower complexity of the linear detection and the superior performance of the MAP detection. Using the a prior probability of the coded bit which is extrinsic of the outer decoder, we compute the threshold of grouping and determine the detection scheme symbol by symbol. Through the simulation results, it is shown that the proposed receiver obtains the superior performance to the MMSE detector and the lower complexity than the MAP detector