无线通信技术已经运用在我们生活的每个角落，然而由于现实传输的复杂性和不确定性，同时无线信道存在着慢衰落、快衰落效应，会一定程度上造成资源的浪费和通信质量的下降。协同通信是近些年来无线通信研究的热点，它相对于传统无线通信技术在降低成本、节约资源等方面具有明显的优势。协同通信中，中继选择算法根据遵循的标准不同有着不同的算法-Wireless communication technology has been applied in every corner of our life. However, due to the complexity and uncertainty of the real transfer, also wireless channel exist slow fading and fast fading effect, will cause a waste of resources and communication quality decline to a certain extent. Cooperative communication in recent years is the focus of the research of wireless communication, it is relative to the traditional wireless communication technology in reducing cost, saving resources has obvious advantages. Cooperative communication, relay selection algorithm according to different standards have different algorithms