Iterative Frequency Domain Joint-Over-Antenna Receiver for Multiuser MIMO

Abstract:
Iterative frequency domain (FD) minimum mean square error (MMSE) equalization in multiple-input-multiple-Output (MIMO) systems has been recognized as a key technique for enabling broadband wireless access with single carrier signaling. However, performance of the iterative FD MIMO minimum mean square error (MMSE) equalization has been previously studied only in point-to-point scenarios. In this paper, we proposed a new iterative FD MMSE multiuser MIMO signal detection technique, joint-over-antenna (JA) detection. The proposed detector is based on soft-cancellation and MMSE filtering with maximum a posteriori probability (MAP) detector over the multiple transmit antennas. Numerical results show that JA significantly outperforms the receiver that detects transmit antenna signals antenna-by-antenna (AA). The proposed iterative FD JA technique achieves larger performance gains compared to AA when the total number of transmit antennas is larger than the number of receiver antennas, as well as in the presence of spatial correlation on transmitter side.