Abstract: By studying the existing probabilistic data association (PDA) algorithm for MIMO system, this paper proposed a generalized probabilistic data association (GPDA) algorithm for system with the number of receiving antennas less than transmitting antennas and more than half of transmitting antennas.Factors affecting the system performance are discussed, and the GPDA algorithm is revised to be suitable for iterative detection.Simulation results indicate that the GPDA method can effectively improve the detection performance, and the iterative detection can further improve the performance.

Key words: multi-antenna system, iterative detection, PDA algorithm