论文部分内容阅读
为进一步提升全信息交互的多用户多向中继网络的吞吐量和传输可靠性,提出一种简单高效的新型网络编码方法.本文方法基于多级双向网络编码操作,用户两两配对同时向中继节点发送信息符号,中继通过对接收的叠加信号进行硬判决检测以确定这两个符号是否同号,并将判决结果广播给所有用户.如果同号,则可确定这两个用户各自的发送信息;如果异号,则任意选出其中一个用户,参与下一轮配对,直到实现所有用户的信息交互.理论分析和仿真结果表明提出方法较传统路由方法和现有的二进制网络编码方法,单源单信道的吞吐量都有显著的提升.而且,由于三电平脉冲幅度调制(3-PAM)的简单特性,与大规模多向中继网络的文献方法相比,本文方法的复杂度更低,可靠性更高.此外,在加性高斯白噪声(AWGN)信道下,采用基于低密度校验(LDPC)码的新型网络编码可以进一步增强可靠性.仿真结果表明:用户数目越多,本文方法较文献方法的增益越大,并且联合信道编码后的增益进一步加大.
In order to further improve the throughput and transmission reliability of multi-user multi-direction relay network with full information interaction, a new simple and efficient network coding method is proposed.This method is based on multi-level two-way network coding operation, Following the node to send the information symbol, the relay performs hard decision detection on the received superposition signal to determine whether the two symbols are the same, and broadcasts the decision result to all users. If the same number, then the two users can determine their own Send the information, if any, select any one of the users to participate in the next round of pairing until all users’ information interaction is achieved.Theoretical analysis and simulation results show that the proposed method is more traditional routing methods and existing binary network coding methods, Single-source single-channel throughput has significantly improved.Moreover, due to the simple nature of three-level pulse amplitude modulation (3-PAM), compared with the literature method of large-scale multi-directional relay network, the complexity of this method Lower, and more reliable.In addition, new network coding based on Low Density Parity Check (LDPC) codes can be further enhanced under additive white Gaussian noise (AWGN) channels Reliability.The simulation results show that the more the number of users, the greater the gain of the proposed method compared with the literature method and the further increase of the joint channel coding gain.