基于网络编码的多用户通信

摘要

Network coding can reduce the outage probability and enhance the reliability of communication system. In order to reduce the outage probability of the communication system,a non-binary network coding of cooperative communication scheme is proposed. Non-binary network coding is not simple binary XOR for the information of out users,but superposition based on certain combinations. Every user decides whether to implement network coding according to the correct decoding received information of out users. The destination can receive signals from multiple senders,and uses coherent detection to get the information which it wants. Formula derivations and sys-tem simulation results show that under Rayleigh fading channels,the proposed scheme can effectively reduce the outage probability.%　　网络编码可以降低通信系统的中断概率，提高系统的可靠性。为了降低通信系统的中断概率，提出一种非二进制的网络编码协作通信方案。非二进制网络编码对接收到的外来用户信息和自身的信息不再进行简单的二进制异或，而是根据一定的组合方式进行叠加。各用户根据是否正确解码接收到的非自身信息来决定是否进行网络编码，目的端同时接收到多个发送端的信息，利用相干检测得到需要的信息。公式推导和系统仿真表明在瑞利衰落环境下，该方案能有效降低系统的中断概率。