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中文摘要：
传统半双工放大转发（AF）协同通信无论信道状态如何,总是采用协同通信模式,在一定程度上降低了系统自由度的利用率。基于此研究了“何时协同”与最优发送功率分配的问题。首先给出了AF系统的遍历容量表达式及其上界;然后以遍历容量上界为代价函数,提出一种适用于AF系统的近似最优功率分配方案（AOPA）,通过比较源—目的端与中继—目的端的统计信道增益来判定是否需要采用协同通信模式;最后,还分析了在中继端按随机方向模型移动时AOPA方案的性能。理论分析和仿真结果表明,AOPA方案在系统容量和误码差错性能上均要优于等功率EPA方案。
英文摘要：
Conventional half-duplex amplify-and-forward （AF） method always adopted cooperative communications model regardless the fading state of the channel, which made insufficient use of the degrees of freedom of the system in a way. So, the problem about ＂when to cooperate＂ and the optimum allocation of transmitted power were discussed. An exact ergodic capacity formulation and corresponding upper bound were first derived for a two-user AF cooperative communications system. And then an approximately optimum power allocation scheme （AOPA） was proposed by making use of the upper bound as cost function. Whether the AOPA scheme adopting the cooperative model or not based on the comparison about the channel gains of source-to-destination with that of relay-to-destination. Finally, the system performances were analyzed with AOPA scheme when the relay moved in terms of the random direction model. Theoretical analysis and simulation results show that the AOPA outperforms the EPA scheme both in ergodic capacity and symbol-error-rate（SER） performance.
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