Coordinated Downlink Precoder Design for Regenerative Multi-User Relaying
Regenerative relaying is an efficient method of increasing the achievable capacity and cell coverage. The authors propose a weighted mean squared error (WMSE) minimization based throughput maximizing precoder design subject to separate sum transmit power constraints for the base station (BS) and relay station (RS). The proposed algorithm is implemented in a distributed manner, thus, further improving the efficiency. They assume a system consisting of a single multi-antenna BS and multi-antenna RS, both of which are serving multiple singleantenna users. They consider a two-stage transmission strategy, in which, at the first stage, BS transmits to the associated users and the RS.