基于译码前传的跨层中继选择策略研究

协作中继提高了无线网络系统的可靠性。基于译码前传模式,结合跨层协作思想,提出了一种基于MAC层和物理层的跨层中继选择实现方案。方案首先解决了中继协作时机问题;以最小中断概率为目标,给出了如何选择中继节点以及分配发射功率的方法;最后给出了跨层协作中继选择实现框图及具体步骤。以跨层设计为基础,中继进行选择时可以依据最新的信道状态信息,使选择更加有效;拥有具体的发射功率分配方案,能够更有效地利用发射功率。仿真结果表明,所提方案能够获得更好的中断概率性能。

The strategy of relay selection based on DF by cross-layer

The performance of system was improved by the application of the cooperative communications in wireless network.Consider the thought of cross-layer and collaborate MAC layer and physical layer,a program of relay selection by cross-layer based on Decode and Forward model was proposed.The problem of when to cooperative was solved and the method of how to choose a relay and how to allocate the transmission power for the goal of minimizing the outage probability was given.At the same time,the frame and the concrete steps of relay selection by cross-layer were given too.The program can select the relay effectively by the latest channel state information,because it based on cross-layer thought.Moreover,it owns the specific distribution of transmission power,so can use the transmission power more efficiently.The simulation results show that the program can achieve a better performance of outage probability.