Combined space-time trellis-coded modulation and group multiuser detection

We propose a robust transceiver for space-time trellis coded modulation multiuser communications. Users in our system are divided into a number of groups using the group signatures proposed in Tran et al. (2002). The multiuser detection at the receiver is performed in group fashion after the group interference cancellation. The trellis decoding and multiuser detection are performed jointly in an iterative manner. Computer simulation results show that our receiver approaches single-user performance after three iterations. The computational complexity per user per code symbol of our receiver is much lower than the receiver proposed in Lu et al. (2000). We conclude that the proposed transceiver is robust and has low complexity for wireless multiuser communications systems.