同时同频全双工自适应干扰对消系统的研究

发布时间：2018-03-17 19:51

本文选题：同时同频全双工　切入点：FPGA　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着移动通信的快速发展,5G通信标准的制定工作逐步开展,作为5G关键技术之一的同时同频全双工技术受到国内外的广泛关注。本文以标准的LTE通信频段为应用背景,对同时同频全双工对消系统及其关键部件进行了深入研究。相比在WARP、USDR等软件无线电平台上实现同时同频全双工系统,本文的研究成果可以为实际应用提供一体化、小型化的研究基础。本文的主要研究内容如下:(1)设计了一种工作频率为2.4GHz的同时同频全双工对消系统方案。此方案基于射频重构模拟自干扰对消技术,先利用发射信号作参考本振信号与自干扰信号直接正交混频,然后通过FPGA控制系统提取自干扰信号的相幅信息,进而控制改进型数字矢量调制器对发射参考信号进行重构,最终实现对自干扰信号的对消。通过Matlab软件仿真验证了该方案的可行性,取得较好的对消效果。(2)设计和实现了对消系统中的各模块,包括自干扰对消模块、自干扰信号检测模块和控制模块。主要研制了正交耦合器、矢量调制器、合路器(功分器)、正交混频器、射频放大器、有源低通滤波器和误差放大器以及FPGA控制电路等关键部件。(3)基于FPGA完成了 AD、DA和相幅计算等模块构成的整个系统软件,并通过实测验证了本系统的可行性。
[Abstract]:With the rapid development of mobile communication, the establishment of 5G communication standard has been carried out step by step. As one of the key technologies of 5G, simultaneous full-duplex technology has attracted wide attention at home and abroad. In this paper, the standard LTE communication frequency band is used as the application background. In this paper, the simultaneous full duplex cancellation system and its key components are deeply studied. Compared with the software radio platform such as WARPU USDR, the research results of this paper can provide integration for practical applications. The main contents of this paper are as follows: (1) A scheme of simultaneous full-duplex cancellation with working frequency of 2.4 GHz is designed. This scheme is based on RF reconfigurable analog self-interference cancellation technology. First, the transmitted signal is used as the reference local oscillator signal and the self-interference signal is directly orthogonal mixed, then the phase amplitude information of the self-interference signal is extracted through the FPGA control system, and then the modified digital vector modulator is controlled to reconstruct the transmitted reference signal. Finally, the self-interference signal cancellation is realized. The feasibility of the scheme is verified by Matlab software simulation, and the design and implementation of each module in the cancellation system, including the self-interference cancellation module, is achieved. Self-interference signal detection module and control module. The orthogonal coupler, vector modulator, combiner (power divider, quadrature mixer, RF amplifier) are developed. Active low-pass filter, error amplifier and FPGA control circuit are the key components. The whole system software is completed based on FPGA, and the feasibility of the system is verified by actual measurement.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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