Approximate minimum SER precoding for spatial multiplexing over Ricean channels

The approximate minimum average symbol error rate (SER) precoder is designed for spatial multiplexing (SM) system in Ricean channels. Based on long-term channel state information (CSI), a closed-form solution that combines eigen-beamforming (E-BF) and power allocation is presented for correlated Ricean channel. Moreover, a simple precoder only based on K-factor and line-of-sight (LOS) departure angle is derived for independent Ricean channel, which needs less feedback overhead and lower computational complexity. The simulation results confirm the effectiveness of these precoders.