基于网络编码的双端系统可达数据率研究

摘要

信号在无线信道中存在着衰弱，这将严重影响系统容量。而使用网络编码，无需增加任何额外资源，就能提高系统性能。研究了瑞丽衰落信道下，使用网络编码的双端系统可达数据率最大化问题。首先通过研究丢弃概率导出容量模型，再使用可行域搜索法获得最优值。数值结果表明，采用网络编码可大幅提高系统可达数据率。而根据各链路信道特性的不同，合理地配置各时段的传输时间和发送功率，可使得系统可达数据率最大化。%The signal will fade in the wireless channel, which seriously affects the system capacity. Network coding can improve system performance, without adding addtional resources. This paper researched the reliable throughput under Rayleigh channel by network coding. The paper gets the system module through studying the outage probability,and obtains the optimal value by feasible region search. The numerical results show that network coding can significantly improve the system output. Depending on the channel characteristics of each link, the system can achieve maxmal throughput by allocating the sending data rate and time.