无线MIMO干扰信道中关键技术研究

发布时间：2018-03-14 21:14

本文选题：干扰对齐　切入点：多输入多输出　出处：《天津大学》2014年硕士论文　论文类型：学位论文

【摘要】：干扰对齐(Interference Alignment)作为一种新的理念在干扰网络的容量分析方面备受关注,它突破了人们关于无线网络吞吐量限的传统认识,为未来无线通信系统在多用户干扰条件下实现大容量和高速率通信提供了理论基础。近年来的研究,无论是在干扰网络自由度域(Degrees of Freedom)分析方面还是在干扰对齐算法的开发方面,都取得了显著的成果。然而,对于多用户多输入多输出(MIMO)干扰网络,由于其复杂的干扰结构和接收信号空间纬度的限制,传统的干扰对齐算法难以有效抑制干扰。另一方面,已有干扰对齐算法假设发送端已知信道状态信息,这对于信道状态信息(CSI,Channel State Information)的获取方式也提出了要求。此外,针对两用户多输入多输出干扰网络自由度域的分析,非延迟接收端信号反馈方式并不符合实际通信系统。据此,本文的主要工作如下:针对发送端对于干扰网络信道状态信息的需求,在结合信道估计误差情况下,提出了基于非失真反馈的信道状态信息获取方法,并利用分步求解目标函数思想得到最优反馈时间比。针对接收信号空间维度受限对于干扰对齐算法性能的影响,提出了基于接收信号分解和加权重建干扰信号的干扰消除算法。理论分析和仿真结果显示,新的算法不仅可以有效抑制信号空间维度受限引起的算法性能下降,同时,可以消除在发送端信号相关情况下,传统干扰对齐算法性能恶化的不足。基于部分本地反馈加延迟发送端信道状态信息的假设,从信息论的观点分析并刻画两用户干扰网络的自由度域外界,同时,提出一种新颖的多时隙传输方案。该方案证明了上述所得自由度域外界是严格紧界。
[Abstract]:As a new concept, interference alignment has attracted much attention in capacity analysis of interference networks, which has broken through the traditional understanding of the throughput limits of wireless networks. It provides a theoretical basis for the future wireless communication system to realize large capacity and high rate communication under the condition of multi-user interference. Significant achievements have been made both in the analysis of interference network degrees of freedom and in the development of interference alignment algorithms. However, for multi-user multi-input and multi-output MIMO-jamming networks, Because of the complex interference structure and the limitation of the spatial latitude of the received signal, the traditional interference alignment algorithm is difficult to suppress the interference effectively. On the other hand, the existing interference alignment algorithms assume that the channel state information is known at the sender. This also requires the acquisition of channel state information (CSI) State information. In addition, for the analysis of two users with multiple input and multiple output interference network degrees of freedom domain, the signal feedback mode at the undelayed receiver does not accord with the actual communication system. The main work of this paper is as follows: aiming at the demand of the sender for interfering the network channel state information, a channel state information acquisition method based on non-distortion feedback is proposed under the condition of channel estimation error. The optimal feedback time ratio is obtained by solving the objective function step by step. An interference cancellation algorithm based on received signal decomposition and weighted reconstruction interference signal is proposed. The theoretical analysis and simulation results show that the new algorithm can not only effectively suppress the performance degradation caused by the spatial dimension constraints of the signal, but also reduce the performance of the algorithm. It can eliminate the shortcoming of the traditional interference alignment algorithm in the case of signal correlation. Based on the assumption of partial local feedback and delayed channel state information, From the viewpoint of information theory, this paper analyzes and characterizes the degree of freedom domain environment of two-user interference network, and proposes a novel multi-slot transmission scheme, which proves that the external domain of the above degree of freedom domain is strictly compact.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.3

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