Optimal Power Allocation for a Cooperative Scheme Utilizing Rotation Code

To overcome the resource inefficiency results from equal power allocation(EPA),an optimal power allocation(EPA) algorithm is proposed for the cooperative scheme utilizing rotation code.The upper bound of the end-to-end system symbol error rate(SER) is first derived using the Chernoff bound,and then under the total power constraint,the power factor is obtained to minimize the SER bound according to the average channel gains.The power allocation information is transmitted to cooperative users through feedback channels,so that the system source utilization can be improved.The effectiveness of the proposed OPA algorithm is verified by simulations.