中文摘要：

研究了协作通信系统中功率分配的问题,主要研究了固定放大转发协议下单中继系统的功率分 配.首先对系统的误码率进行了推导并以最小化系统的误码率为目标对优化问题进行了定义;其次引人惩罚 因子将有约束的最小误码率优化问题转化为无约束优化问题进而建立新的目标函数;最后提出了人工鱼群 和粒子群相结合的算法对系统优化问题进行了求解.仿真结果表明所提算法提升了系统的性能并降低了计 算复杂度.

英文摘要：

Power allocation of the cooperative communications was investigated, as well as an optimal power allocation of single relay system with amplify- and-forward （A F ） protocol. The instantaneous symbol error rate （SER） for the AF relay system was derived first and the objective of optimization by minimizing the system error rate was defined. Secondly,the penalty factor was introduced to transform the constrained minimum bit error rate problem into an unconstrained problem and then a new objective function was established. Finally,a combination of artificial fish swarm and particle swarm optimization algorithm（ AFPSO） was proposed to solve the system optimization problem. Simulation result shows that the proposed algorithm can improve the system performance and reduce the computational complexity.