求翻译：在协作通信系统中进行中继选择时，可能出现最佳与次佳中继节点不可用的情况、因而需要研究第 佳中继选择算法的性能。当信道为频率选择性衰落时，常规的中继选择算法可能无法直接应用。针对这些问题，本文研究了多径信道条件下 佳中继选择的分集阶数，并研究了协作通信中的空时均衡接收检测算法。主要内容如下：是什么意思？

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In collaborative communications system Trunk Selection, you may receive the best and the second best Relay node is not available and therefore needed to be looked at better Trunk Selection Algorithm Performance. When the channel is frequency selective atrophied conventional trunk selection algorithm

Carries on the relaying choice when the cooperation communications system, possibly appears best with the good relaying node not available situation, thus needs to study the good relaying choice algorithm the performance.When channel for frequency selectivity decline, the conventional relaying choic

When relay selection in collaborative communication system, possible the best and second-best relay node is not available, and therefore need to study better relay selection algorithms. When the channel for frequency-selective fading, conventional relay selection algorithms may not be directly appli

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