Rayleigh衰落信道下的无线网络编码  

Wireless network coding over Rayleigh fading channels

作　　者：李伟 樊平毅[1] 李颉[2] 

机构地区：[1]清华大学电子工程系,微波与数字通信国家重点实验室,北京100084 [2]筑波大学计算机科学系,筑波市305857

出　　处：《清华大学学报（自然科学版）》2011年第1期126-130,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金委与香港研究资助局联合资助项目(60831160524)

摘　　要：网络编码技术是一种能有效提高网络吞吐量的新技术。但是在实际的无线网络中,数据传输会受到信号衰落的影响,导致误码率增加以及网络吞吐量下降,使得无线网络编码技术的实际性能下降。为了进一步提高无线网络编码的性能,该文分析了Rayleigh衰落信道下网络编码的性能,并将其归纳为一个最优化问题。通过求解该最优化问题,给出了编码节点的最优传输策略,即最优传输功率与最优传输速率。数值解与仿真结果显示:该策略能有效提高网络的吞吐量。Wireless network coding is a useful technology which can increase the total throughput of wireless networks.However,data transmission in wireless networks is affected by signal fading.With time-varying signal fading,the bit error rate increases and throughput decreases,which results in performance degradation of wireless network coding.The performance of network coding over Rayleigh fading channels was investigated and formulated as an optimization problem to further improve the performance of wireless networks.The solution of the optimization problem gives the optimal transmission scheme,i.e.,the optimal transmission data rate and the optimal transmission power level to maximize the total throughput.Simulations and numerical results indicate that this optimal transmission scheme effectively increases the total throughput.

关 键 词：网络编码 RAYLEIGH衰落 最优传输策略 

分 类 号：TN975[电子电信—信号与信息处理]