室内全双工自干扰信道测量与建模

发布时间：2018-01-13 00:34

本文关键词：室内全双工自干扰信道测量与建模　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：一直以来,无线通信都是以半双工方式进行的,时分双工或频分双工,频谱效率低下。随着各种通信技术对频谱资源的占用,无线电频谱稀缺性日益凸显。目前,同时同频全双工技术取得了突破性进展,该技术理论上可以节约一半频谱,将缓解频谱资源紧张的现状。全双工通信的一个技术难点是消除本地发射机对接收机的超大功率干扰,即信道自干扰。掌握自干扰信道特性有助于最大可能地抵消自干扰信号,而这方面研究成果还相当缺乏。鉴于此,论文提出一种室内全双工自干扰信道测量方案,搭建了测量平台实测得到大量数据,提取了自干扰信道参数,并试图建立模型。主要内容包括:第一,针对室内无线信道,研究了常见信道测量方法及室内模型。探究了周期脉冲探测法、伪随机序列滑动相关法、频域测量法原理并分析各自利弊,同时研究了对数距离路径损耗模型、Ericsson多重断点模型等常见室内信道模型,为全双工自干扰信道测量与建模奠定基础。第二,根据室内全双工自干扰信道特点,提出信道测量方案、掌握实测关键技术。论文搭建频域测量平台、确定测量天线间距为0.05m~1.5m、规划256个测量位置分布并在实验室中实测得到3328组数据,掌握了频域测量关键技术。第三,给出频域数据处理方法,提取路径损耗参数,建立信道大尺度衰落模型。首先对频域数据加窗滤波,然后求取测量点功率损耗,最后通过数据拟合方式建立路径损耗分段模型,结果显示近场路径损耗系数为1.515,远场路径损耗系数为1.856。第四,通过Chirp z反变换,从时域处理信道功率时延谱,提取均方根时延扩展参数并建立模型。得到信道功率时延谱后,设置噪声功率忽略底噪影响,调整时间零点,根据实测数据拟合得到均方根时延扩展对数正态分段模型。论文提出了一种室内全双工自干扰信道模型,为人们掌握自干扰信道特性提供依据,为自干扰信号抵消技术提供参考,进一步促进全双工技术的发展与应用。
[Abstract]:Since wireless communication is carried out in the half duplex mode, time division duplex or frequency division duplex, the spectrum efficiency is low. With the occupation of various communication technologies of spectrum resources, radio spectrum scarcity has become increasingly prominent. At present, at the same time with the same frequency full duplex technology has made a breakthrough, this technology can save half spectrum theory that will ease the shortage of spectrum resources status. A technical difficulty of full duplex communication is to eliminate the large power interference to the receiver local transmitter, channel self interference. Master self interference channel characteristics contribute to the maximum possible offset from the interference signal, and this research is still lacking. In view of this, this paper proposes a indoor full duplex self interference channel measurement scheme, setting up a measurement platform obtained large amounts of data, extraction of the self interference channel parameters, and tries to establish the model. The main contents include: A, according to the indoor wireless channel, the channel model of common measuring method and indoor. Explores the periodic pulse detection method, pseudo random sequence correlation method, the principle of frequency measurement method and analyzes their advantages and disadvantages, and study the logarithmic distance path loss model, Ericsson model and multiple breakpoint common indoor channel model for full duplex self interference channel measurement and modeling foundation. Second, according to the indoor full duplex self interference channel characteristics, proposes the channel measurement scheme, master the key technology of measurement. The paper built the frequency measurement platform, determine the measurement of antenna spacing is 0.05m~1.5m, planning 256 measuring position distribution and the measured data of the 3328 groups in the laboratory, mastered the key technology of frequency measurement. Third, given the frequency domain data processing method, extraction path loss parameter, the establishment of large scale channel fading model. Firstly, the frequency domain data window filter, however After obtaining the measuring point power loss, finally through data fitting method to establish the path loss model results show that the near field segment, the path loss coefficient is 1.515, the far field path loss coefficient is 1.856. fourth, the Chirp inverse Z transform in time domain channel power delay spectrum extraction, RMS delay spread parameter and establishes the model of channel. The power delay profile, set the noise power ignore background noise effect, adjust the zero time, according to the measured data by fitting the RMS delay expansion of piecewise lognormal model. This paper presents an indoor full duplex self interference channel model, provide the basis for people to master the self interference channel characteristics, provide the reference for the self interference cancellation technology and further promote the development and application of full duplex technology.

【学位授予单位】：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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