Optimal Power Allocation for Cooperative Networks

In cellular network, the deployment of the relay station can bring spatial diversity to increase link capacity and improve communication performance. In this paper, we consider an optimal power allocation scheme for the source and the relay to minimize the bit error rate(BER) at the destination under the power and outage constraint in cooperative relay system. Simulation results show that the BER performance can achieve a significant gain by the proposed power allocation scheme. With different relay strategies such as AF and DF, different transmit power are allocated for the source and the relay to achieve the required BER performance in the downlink cooperation.