Generalized mutual information based LTE-Advanced uplink MIMO receiver analysis

The low peak-to-average power ratio of SC-FDMA, employed in the 3GPP-LTE-Advanced uplink, comes at the cost of tremendously increased receiver complexity as compared to OFDM. In this work, we investigate the achievable rate of four low-complexity, mismatched receiver designs based on our recently developed generalized mutual information framework. The receiver performance is analyzed depending on the channel length, subcarrier mapping and spatial correlation. Results may guide the system designer to choose a receiver, matched to the expected operation conditions. Numerical results stress that receivers which treat a MIMO channel with memory as if it was memoryless may be well suited for narrow bandwidths while additional frequency domain interference cancellation may be required when using large bandwidths.