一种提高协作通信性能的新方法.pdfVIP

第 8 卷 第 6 期 信 息 与 电 子 工 程 Vo1．8，No．6 2010 年 12 月 INFORMATION AND ELECTRONIC ENGINEERING Dec．，2010 文章编号： 1672-2892(2010)06-0742-05 一种提高协作通信性能的新方法 徐 娜，汪 翔，倪卫明 (复 旦大学 通信工程系，上海 200433) 摘 要 ：传统的无线通信中，由于外部环境的干扰，信道的不稳定，网络的中断率比较高。 在信道条件较差时，通信性能较差。本文利用无线通信节点间的合作，通过不同节点对信息的中 继放大、解码(或者网络编码)，对直接传输的无线信道性能进行改进，大大提高了网络性能，降低 网络的中断率；通过比较不同频谱效率下的不同转发方式的中断率性能，选择合适的传输方法。 仿真实验得到：频谱效率小于一定值的情况下，利用放大和网络编码转发方式的性能大大高于直 接传输方式。 关键词 ：无线通信；协作通信；中继；解码转发；网络编码 中图分类号 ：TN915.01 文献标识码 ：A A new method to improve the performance of cooperative communication XU Na，WANG Xiang，NI Wei-ming (Department of Communication Science and Engineering，Fudan University，Shanghai 200433，China) Abstract： In traditional wireless communication, due to the interference of the external environment and channel instability, the outage probability of network is high. The communication performance is poor under bad channel condition. In this paper, the network performance is improved through the cooperation among wireless nodes. The performance of wireless channel is enhanced in direct transmission through relay of different nodes(amplification, decoding, or the network coding). The network outage probability is reduced with the use of decode-forward and network coding forward. The proper forward method c an be found by the comparison of the outage probability under differe nt spectral efficiencies. Simulation results indicate if the spectral efficiency is less than some certain value, the performance of amplify-forward and network coding forward are much better than tha