The Value of Channel Prediction in CoMP Systems With Large Backhaul Latency
The quality of Channel State Information (CSI) has large impact on the performance of Coordinated Multi-Point (CoMP) systems. In this paper, the authors study the impact of channel prediction on the performance of coherent CoMP transmission in time-varying channels with large backhaul latency. They resort to large system analysis to derive an explicit expression of the average user rate of the CoMP system when predicted channels are employed for downlink precoding. By comparing with the Non-CoMP systems, they find that channel prediction brings much higher performance gain to CoMP systems with respect to channel estimation.