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中文摘要：
为了进一步提高中继系统的可靠性和频谱效率,提出了联合固定网络编码与混合自动重传请求（DNC-HARQ）和联合随机网络编码与混合自动重传请求（ONC-HARQ）2种传输协议,分析了这两种传输协议的系统中断概率和频谱效率.以最大化系统频谱效率为优化目标进行跨层优化设计,并利用迭代算法求解.仿真结果表明,DNC-HARQ和ONC-HARQ传输协议比只采用网络编码的传输协议具有更高的系统可靠性,比仅采用HARQ的传输协议具有更高的频谱效率;所提出的基于最大化频谱效率的跨层优化算法能有效地最大化系统频谱效率.
英文摘要：
To improve the spectrum efficiency and reliability of relay system, two transmission protocols combined network coding and hybrid automatic repeat request （HARQ） are proposed, the HARQ proto- col is based on determination network coding（DNC-HARQ） ,and the HARQ protocol is based on oppor- tunity network coding（ONC-HARQ）. The performance of outage probability of system and the spectrum efficiency of these two protocols are analyzed. Furthermore, an optimize problem is elicited to maximize the spectrum efficiency of system. As the optimize problem is non-convex, an iterative algorithm is de- signed to solve it. Simulations confirm that the two protocols presented is with higher reliability than the protocol with network coding, more spectrum efficiency of systems is obtained than the protocol with HARQ. Simulation shows the iterative algorithm designed can effectively maximize the spectrum efficiency of system.
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