Abstract:

A novel blind spacetime multiuser detection algorithm based on oblique projection is presented for multiple input multiple output (MIMO) code division multiple access (CDMA) systems. The proposed algorithm, which integrates the available information of spatial diversity technique with spacetime block coding (STBC) scheme of MIMO systems, can adaptively trace interference subspace and estimate wireless channels with low complexity. Then,  an oblique projection algorithm is used for the received signal to suppress multiple access interference (MAI). Simulation results reveal that it has a faster speed of convergence and higher stable performance in strong MAI than the conventional blind minimum mean square error (MMSE) space time multiuser  detection. So this algorithm is better in robustness and performance.