MIMO detection in single carrier systems

This paper proposes a novel 2-stage receiver for single user single-carrier frequency-division multiple access (SC-FDMA) uplink transmission. The proposed receiver consists of separate stages for inter-symbol interference (ISI) and inter-antenna interference (IAI) mitigation in frequency selective MIMO channels. The main focus is on the single user case where the IAI between the MIMO streams needs to be addressed. A new 2-stage receiver structure is introduced where sphere detection algorithms are used in the time domain to remove the IAI while minimum mean square error (MMSE) equalization is used in the frequency domain to suppress the ISI. The numerical results show that the proposed receiver outperforms the conventional MMSE receiver under the presence of spatial correlation between both the transmit and receive antennas.