Abstract: To improve the throughput of terminals at cell edge in LTE-Advanced systems, an improved local precoding scheme was proposed for coordinated multipoint (CoMP) transmission systems based on the existing methods, which can solve the problem of inter-layer interference when traditional local precoding is applied in high rank channel, i.e. the rank is larger than 1. The proposed scheme introduces layers swapping and phase correction selectively to the transmitting end, which is determined by maximizing the signal-to-interference plus noise at the receiving end. The simulation results show that the proposed scheme can improve the spectral efficiency of users at cell edge, and then improve their throughput.  

Key words: coordinated multi-point (CoMP) transmission, local precoding, layers swapping, phase correction, spectral efficiency