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为了提高协作中继系统频谱效率性能,对Nakagami-m衰落信道中联合物理层自适应调制编码(AMC)和链路层混合自动请求重传(HARQ)协议跨层设计方法进行研究.首先提出一种状态转移图来分析计算协作中继系统的误包率(PER);然后建立了最大化系统频谱效率的跨层优化模型,并给出迭代求解算法;最后对3种HARQ协议下中继系统性能进行对比分析.仿真结果表明,协作中继系统的性能明显优于非中继协作系统,联合Ⅲ型HARQ的跨层设计可实现比联合Ⅰ型和联合Ⅱ型HARQ更高的频谱效率和更低的PER.
In order to improve the spectrum efficiency performance of cooperative relay system, a cross-layer design method of Joint Physical Layer Adaptive Modulation and Coding (AMC) and Link Layer Hybrid Automatic Repeat Request (HARQ) protocol in Nakagami-m fading channel is studied. State transition diagram to analyze and calculate the packet error rate (PER) of the cooperative relay system. Then, a cross-layer optimization model to maximize the spectral efficiency of the system is established and an iterative solution algorithm is given. Finally, The performance of which is compared and analyzed.The simulation results show that the performance of cooperative relay system is obviously better than that of non-relay cooperative system, and the cross-layer design of combined type III HARQ can achieve higher spectrum efficiency and more efficiency than combined type I and combined type II HARQ Low PER.