多用户中继干扰信道中干扰对齐算法研究

发布时间：2018-10-30 12:14

【摘要】：干扰对齐技术能够有效克服传统干扰管理方法上的不足,提高系统自由度,成为了应用于干扰信道的一种有效干扰管理方法。对于无中继的多用户干扰信道,干扰对齐算法要求各发送节点均具有全局信道状态信息,大大的增加了系统开销。因此,本文主要研究了多用户中继干扰信道,并针对不同的中继方式,研究相应的干扰对齐算法,提升了系统性能。论文主要工作如下:1.搭建了K用户干扰信道和K用户中继干扰信道系统模型,研究了不同模型中干扰对齐算法的基本原理,并对其性能进行了仿真分析。2.针对K用户中继干扰信道,设计了一种结合干扰对齐算法与Alamouti空时编码的信号传输处理方法,该方法中各用户发送端对所发送的信号进行Alamouti编码,并将Alamouti空时码符号发送至接收端;通过设计中继端的干扰对齐预编码矩阵,从而在接收端实现干扰信号对齐,最后消除干扰信号后获得期望信号;通过理论分析和仿真验证,表明该方法可提高多用户中继干扰信道的分集增益。3.提出了一种K用户双中继系统中的信号传输处理方法。通过中继交替传输接收信号以及设计中继间的干扰对齐矩阵,该方法克服了由于中继半双工工作方式所导致的系统速率的损失。通过分析和仿真验证,表明所提出方法可以提高K用户中继信道的自由度,从而提高系统容量。
[Abstract]:Interference alignment can effectively overcome the shortcomings of traditional interference management methods and improve the degree of freedom of the system. It has become an effective interference management method applied to interference channels. For the multi-user interference channel without middle succession, the interference alignment algorithm requires all the sending nodes to have global channel state information, which greatly increases the system overhead. Therefore, this paper mainly studies the multi-user relay interference channel, and studies the corresponding interference alignment algorithm for different relay modes to improve the performance of the system. The main work of this paper is as follows: 1. The system models of K user interference channel and K user relay interference channel are built. The basic principle of interference alignment algorithm in different models is studied, and its performance is simulated and analyzed. 2. For K user relay interference channel, a signal transmission processing method combining interference alignment algorithm and Alamouti space-time coding is designed. In this method, the transmitted signals are encoded by Alamouti at each user transmitter. The Alamouti space-time symbol is sent to the receiving end. By designing the interference alignment precoding matrix at the relay terminal, the interference signal is aligned at the receiving end, and the desired signal is obtained after the interference signal is eliminated. Theoretical analysis and simulation results show that the proposed method can improve diversity gain of multi-user relay interference channels. This paper presents a signal transmission processing method for K user dual relay system. The received signal is transmitted alternately and the interference alignment matrix between relays is designed. The method overcomes the loss of the system rate caused by the relaying half-duplex mode. Through analysis and simulation, it is shown that the proposed method can improve the degree of freedom of K user relay channel and thus improve the system capacity.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN972

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