Joint Power Control and Relay Matrix Design for Cooperative Communication Networks with Multiple Source-Destination Pairs

A network with L single-antenna source-destination pairs is considered that uses a half-duplex K-antenna relay to establish the end-to-end links in a dual-hop cooperative communication scheme. The sources share a common channel to concurrently transmit their signals and the relay multiplies its received signal vector with L relaying matrices and then forwards the resulting signal vectors to the destinations in dedicated channels. Under the relay´s transmit power constraint at every channel as well as both sources´ individual and total power constraints, the jointly optimal sources´ powers and the relaying matrices are obtained that maximize the minimum of the normalized signal-to-interference-plus-noise ratios at the destinations. Numerical simulations are then used to verify the analytical results.