基于盲干扰对齐的干扰消除技术研究

发布时间：2018-07-08 11:03

本文选题：干扰对齐 + 发送端信道状态信息　；参考：《东南大学》2017年硕士论文

【摘要】：在多用户多输入多输出(Multi-User Multiple-Input Multiple-Output,MU-MIMO)通信系统中,用户之间的干扰会影响到系统的总体性能。为了消除用户间干扰,通常会采用正交多址技术,比如频分多址(Frequency Division Multiple Access,FDMA)和时分多址(Time Division Multiple Access,TDMA),将信道资源分配给各个用户,这导致信道资源的利用率较低。近年来,干扰对齐(Interference Alignment,IA)这一课题吸引了广泛的研究兴趣。干扰对齐策略使得接收端收到的干扰信号被对齐到较小的信号子空间,同时期望信号仍然可以辨识,最终提高系统的整体自由度(Degrees of Freedom,DoF)。盲干扰对齐(Blind Interference Alignment,BIA)是不需要具备发送端信道状态信息(Channel State Information at the Transmitter,CSIT)即可进行的干扰对齐。本文提出了一种应用于频率选择性信道的半盲干扰对齐策略和一种应用于非对称多小区多输入多输出(Multiple-Input Multiple-Output,MIMO)信道的盲干扰对齐策略。首先,本文对研究背景进行了简单阐述,特别介绍了干扰对齐和盲干扰对齐策略在自由度方面的优势。其次,本文介绍了干扰对齐,半盲干扰对齐,以及盲干扰对齐的基础理论知识。接着,本文提出了一种应用于两用户下行频率选择性信道的半盲干扰对齐策略。该策略利用了信道的频率选择性结构,在发送端不需要具备准确的信道系数以及接收端不需要配备可重构天线的情况下即可进行干扰对齐。与传统的干扰控制技术FDMA相比,本文提出的半盲干扰对齐策略可以取得更高的自由度。本文还提出了一种应用于非对称MIMO信道中的盲干扰对齐策略。通过设计发送端的发送方法和在接收端配置可重构天线,可以显著地提高系统的自由度。与传统的干扰控制技术TDMA相比,系统的吞吐量获得明显提高。此外,在本文提出的两种策略中,用户都可以获得较好的分集增益来抵抗信道衰落。
[Abstract]:In Multi-User Multiple-Input Multiple-Output MU-MIMO (Multi-User Multiple-Input Multiple-Output MU-MIMO) communication systems, interference between users will affect the overall performance of the system. In order to eliminate inter-user interference, orthogonal multiple access techniques, such as Frequency Division multiple access FDMA (FDMA) and time Division multiple access (TDMA), are usually used to allocate channel resources to individual users, which results in low utilization of channel resources. In recent years, the topic of interference alignment (IA) has attracted extensive research interest. The interference alignment strategy allows the received interference signal to be aligned to a smaller signal subspace, while the desired signal can still be identified, thus increasing the degree of freedom (degrees of freedom) of the system. Blind interference alignment (BIA) is a kind of interference alignment that can be performed without channel state information at the transmitter. In this paper, we propose a semi-blind interference alignment strategy for frequency selective channels and a blind interference alignment strategy for asymmetric multi-cell multiple-input multiple-output (MIMO) channels. First of all, this paper briefly describes the research background, especially introduces the advantages of interference alignment and blind interference alignment in degrees of freedom. Secondly, this paper introduces the basic theory of interference alignment, semi-blind interference alignment and blind interference alignment. Then, a semi-blind interference alignment strategy for two users downlink frequency selective channel is proposed. The strategy utilizes the frequency-selective structure of the channel and can be used for interference alignment without the need for accurate channel coefficients at the transmitter and for the receiver to be equipped with a reconfigurable antenna. Compared with the conventional interference control technique FDMA, the proposed semi-blind interference alignment strategy can obtain higher degrees of freedom. This paper also proposes a blind interference alignment strategy for asymmetric MIMO channels. The degree of freedom of the system can be significantly improved by designing the sending method of the transmitter and configuring the reconfigurable antenna at the receiver. Compared with the traditional interference control technology TDMA, the throughput of the system is improved obviously. In addition, in the two strategies proposed in this paper, users can obtain better diversity gain to resist channel fading.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911.4

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