Achievable sum-rates in MIMO broadcast channels with vector precoding techniques using coded modulation

In this paper we establish end-to-end achievable sum-rates of different linear and non-linear pre-processing techniques employing Amplitude-Shift Keying (ASK)-modulation in a flat-fading Multiple Input Multiple Output (MIMO) broadcast system with single antenna terminals. The obtained results reveal that the Minimum Mean Square Error Vector Precoding (MMSE-VP) technique achieve close to capacity performance in various system settings. Thus it achieves a loss of merely 23 dB compared to the sum-capacity in the mid to high SNR range including the effects of practical system implementations, such as a non-ideal modulation set and a sub-optimal solver at the transmitter. When the SNR is low or when the system experience a small load, simpler pure linear techniques achieve similar performance.