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中文摘要：
为了对抗实际无线信道中多径衰落和更好适应时变的信道状况，在协作通信系统中将链路层HARQ和物理层AMC进行跨层联合。分析了Ⅰ-HARQ、Ⅱ-HARQ、Ⅲ—HARQ三种混合自动重传方案，根据协作系统模型得到系统状态转移图，将协作系统丢包率（PER）转化为链路丢包率，得到了Nakagami—m信道条件下中继接收错误率，依据Nakagami—m信道条件下的跨层设计方案，得到链路平均丢包率表达式。仿真结果表明，对于HARQ和AMC跨层联合系统，协作中继能明显改善其丢包率。
英文摘要：
In order to overcome the multipath fading and adapt to the time-varying channel, we study a cooperative system with cross-layers from HARQ and AMC. Firstly, we study three retransmission schemes, e.g. Ⅰ-HARQ, Ⅱ-HARQ, Ⅲ-HARQ. Secondly, according to the cooperative system model, we get the transition state diagram of the cooperative system. Then, we transform the PER of the cooperative system into PER of the single path, and derive the receive error rate in Nakagami-m channel. At last, a cross-layer scheme is given. At the same time, we get the average PER of the single path. Simulation results show that , the cooperative relay could clear enhance the packet error rate （PER） of the system that combines HARQ in date link layer and AMC in the physical layer.
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