协作通信最优功率分配算法

为了提高协作通信系统的能量利用率,降低系统的误符号率,提出了基于差分演化算法的协作通信最优功率分配算法.建立了多中继转发放大协作通信系统的模型,给出该模型下误符号率的表达式.在此基础上,提出了一种新的差分演化算法来求解最小误符号率时的源节点和各中继节点的最优功率分配.仿真实验结果表明,与等功率分配算法相比,在相同的条件下,新算法能够取得更低的误符号率,显著地提高了协作通信系统的性能.

Optimal power allocation algorithm for cooperative communications

To enhance the efficiency of the power usage in a cooperative communication system,and reduce the error symbol rate,a new optimal power allocation algorithm in a cooperative communication system is proposed which is based on the differential evolution algorithm.First,a cooperative communication system model is given which the relay nodes are evenly distributed between the source node and the destination node.Then,the expression for the symbol error rate is described under this model.After that,the differential evolutionary algorithm is utilized for optimally allocating the power among the source node and the relay nodes under the situation of the minimum symbol error rate.Simulation results show that the proposed power allocation algorithm has a much lower symbol error rate than the equal power allocation algorithm under the same power budget,and the performance of a co-operative communication system is improved.