Power Allocation for Nonregenerative Cooperative MIMO Communication under Various Levels of Channel State Information

This paper proposes various power allocation algorithms for nonregenerative cooperative multi-input multi-output system, which have been optimised based on mutual information for different levels of channel state information (CSI) available at the base station (BS) and at the relay station (RS). Four different CSI settings have been studied in this paper : CSI of both the first and second hop channels known at the BS; CSI of the first hop channel known at the BS and CSI of the second hop channel known at the RS; CSI of both the first and second hop channels known at the RS; and only CSI of the first hop channel known at the RS. The performance of our algorithms have been compared against some previous power allocation methods as well as brute-force power allocation for each of these settings, in order to demonstrate their efficiency.