Channel aging effects in CoMP transmission: Gains from linear channel prediction

CoMP transmission gains attraction for future releases of LTE-Advanced specifications. It is considered for downlink cochannel interference mitigation of OFDMA systems operated at full frequency reuse. However, channel knowledge at the transmitter side will be required, where its usability reduces over time, even under quasi-static mobility. This work studies the range of performance degradation caused by channel aging and delayed utilization for the purpose of joint zero-forcing precoding from a subset of base stations. We demonstrate that channel prediction significantly improves the CoMP performance: There is hardly any difference between ideal and delayed feedback when utilizing prediction filters in low mobility regime.