Joint Transmit/Receive MMSE Filtering for Single-Carrier MIMO Spatial Multiplexing

Multiple-Input Multiple-Output (MIMO) spatial multiplexing is a powerful technique to increase the transmission data rate. However, if MIMO spatial multiplexing is applied to Single-Carrier (SC) block transmissions, it suffers from the Inter-Symbol Interference (ISI) as well as the Inter-Antenna Interference (IAI). In this paper, the authors propose a joint transmit/receive Frequency-Domain (FD) filtering using the Channel State Information (CSI) at both the transmitter and receiver for SC-MIMO spatial multiplexing. The transmit and receive FD filters are derived based on the Minimum Mean Square Error (MMSE) criterion.