全双工MIMO中继系统波束成形与检测算法的研究

发布时间：2018-03-29 00:26

  本文选题：全双工中继　切入点：多输入多输出　出处：《南京理工大学》2016年硕士论文

【摘要】：全双工中继系统能够在相同频率和时间内,同时发送和接收信号,因此与半双工中继相比成倍提高频谱效率。但是由于中继收发端之间存在着信号泄漏,产生了自干扰问题,自干扰使得中继系统性能严重恶化,因此,实现全双工技术的挑战在于如何有效管理全双工带来的自干扰。本文主要围绕译码转发以及放大转发协议下全双工多输入多输出(Multiple-input multiple-output, MIMO)中继系统展开,重点对波束成形抑制干扰算法以及检测算法进行了研究,主要研究工作如下：(一)针对译码转发全双工MIMO中继系统干扰抑制问题,为了更好地抑制干扰提高性能,提出了一种迭代波束成形结构(Iterative beamforming structure, IBS),该算法在中继站采用基于最大化信干噪比(Maximizing signal-to-interference-and-noise ratio, Max-SINR)接收波束成形来抑制中继端的自干扰以及最大化信泄噪比(Maximizing signal-to-leakage-plus-noise ratio, Max-SLNR)发射波束成形来减少中继发送端泄漏到中继接收端的信号。随后,针对抑制后存在的残余干扰,提出了一种低复杂度的基于白化滤波的最大似然检测器。仿真结果表明,提出的IBS算法性能明显优于现有的算法,而且提出的低复杂度检测器与传统最大似然检测器相比,显著的降低了复杂度,并提高了系统的误码性能。(二)针对放大转发的全双工MIMO中继系统,为了进一步提高系统信息传输速率,提出了一种高性能的组合波束成形方案,该组合在源节点和目的节点采用奇异值分解(Singular value decomposition, SVD)的波束成形,而在中继站采用基于Max-SINR接收加Max-SLNR发射组合波束成形算法。随后在两者之间引入迭代结构,进一步优化波束成形矩阵。仿真结果表明,所提出的组合算法速率性能优于现有的波束成形组合。
[Abstract]:Full-duplex relay system can transmit and receive signals simultaneously at the same frequency and time, so the spectral efficiency is greatly improved compared with half-duplex relay. Self-interference seriously degrades the performance of the relay system, so, The challenge of full duplex technology is how to effectively manage the self interference brought by full duplex. This paper focuses on the full duplex multiple input multiple-output (MIMOO) relay system under the full duplex multiple input multiple-output (MIMOO) relay protocol. Beamforming interference suppression algorithm and detection algorithm are studied in detail. The main research work is as follows: (1) aiming at the interference suppression problem of decoding and forwarding full-duplex MIMO relay system, in order to better suppress interference and improve performance, In this paper, an iterative beamforming structure called iterative beamforming structureis proposed. The algorithm uses the received beamforming based on maximizing the signal-to-noise ratio (Max-SLNR) to suppress self-interference and Max-SLNR (Max-SLNR) transmission at the relay end in order to suppress self-interference and maximize the signal-to-noise ratio to maximize signal-to-leakage-plus-noise ratio (Max-SLNR). Beamforming to reduce the signal leakage from the relay sender to the relay receiver. A low complexity maximum likelihood detector based on whitening filter is proposed for residual interference suppression. Simulation results show that the proposed IBS algorithm performs better than the existing algorithms. Moreover, compared with the traditional maximum likelihood detector, the proposed low complexity detector significantly reduces the complexity and improves the error performance of the system. (2) Full-duplex MIMO relay system for amplification and forwarding. In order to further improve the information transmission rate of the system, a high performance combined beamforming scheme is proposed, in which singular value decomposition (SVD) beamforming is used in the source node and the destination node. In the relay station, the combined beamforming algorithm based on Max-SINR receiver and Max-SLNR is adopted. Then an iterative structure is introduced between the two to further optimize the beamforming matrix. The simulation results show that, The rate performance of the proposed combination algorithm is better than that of the existing beamforming combination.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN919.3
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本文编号：1678754