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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.
In order to further improve the reliability and spectrum efficiency of the relay system, two transmission protocols, namely, joint fixed network coding and hybrid automatic repeat request (DNC-HARQ) and joint random network coding and hybrid automatic repeat request (ONC-HARQ) , The disruption probability and spectrum efficiency of the two transport protocols are analyzed. The cross-layer optimization design is carried out with the goal of maximizing the spectral efficiency of the system and the iterative algorithm is used to solve the problem. Simulation results show that the DNC-HARQ and ONC-HARQ transport protocols Has higher system reliability than the transmission protocol using only network coding and has higher spectral efficiency than the transmission protocol using only HARQ. The proposed cross-layer optimization algorithm based on maximized spectral efficiency can effectively maximize the system spectrum effectiveness.