基于随机网络编码的无线中继网络协作传输算法

Cooperative Transmission Algorithm Based on Random Network Coding in Wireless Relay Network

在无线网络中,随机网络编码(RNC)可以有效地提高网络性能。然而,在传统的随机网络编码中,由于无线衰落信道特性,若用户无法正确接收到足够多的编码包,则无法解码出有用信息,导致了随机网络编码性能的降低。如何传输数据量大、延时要求低的多媒体数据成为研究重点。提出了一种基于随机网络编码的无线中继网络协作传输算法。该算法针对多媒体数据的特点,设计编码深度可调的自适应网络编码,并充分利用无线网络中的中继节点作用,与基站协作对网络编码包进行调度传输,以期在规定的数据延时内获取最大化的网络吞吐量,从而有效提高无线网络中多媒体数据传输的能力。仿真结果表明,与其他传输算法相比,该算法在吞吐量上具有良好的性能和效果。

Random network coding （ RNC） is an efficient coding scheme to improve the performance of the wireless multicastnetworks. However,traditional RNC comes with a sacrifice in service performance because if the users are not able to collect enough encoding packets,the useful information cannot be recovered under the wireless fading channel. Thus,how to transmit massive delay-sensitive data becomes the research focus. Accordingly,a new algorithm is proposed,which introduces RNC in the rely-aided wireless network to overcome the problems above. The proposed algorithm fully considers the property of the multimedia data and designs adaptive RNC,in which BS and relay cooperate with each other to choose the best encoding packet for transmission so as to maximize the network throughput for the given hard deadline. Moreover,to show the performance of the proposed algorithm,it’ s compared with other scheduling schemes and the simulation results are provided to corroborate the effectiveness of the proposed technique.