面向无线全双工通信的自干扰消除技术研究

发布时间：2018-04-13 12:13

本文选题：同时同频全双工 + 自干扰消除　；参考：《北京邮电大学》2014年硕士论文

【摘要】：随着无线通信产业的发展,无线通信中使用的信号带宽越来越宽,频谱需求越来越大,相对应的频谱资源却越来越少。目前,无线通信上下行链路从频分多址、时分多址到码分多址的发展,人们一直致力于研究节约频谱资源和最大化利用频谱的算法和技术,此时无线通信学界的另一个提升频谱利用率的研究热点同时同频全双工通信应运而生。同时同频全双工通信中最重要的核心是信号的自干扰消除。因为在同时同频全双工通信中,在发射信息的同时还要接收信息,由于发射与接收同时进行,自干扰信号的功率会远远大于接收对方信号的功率,对接收系统造成严重干扰。不仅有用信息被淹没在强烈的自干扰信号中造成接收数据错误,而且接收链路的低噪声放大器也会接近饱和对接收系统的硬件造成严重危害。因此,要实现全双工通信,必须在接收链路进行自干扰消除。本文重点研究了同时同频全双工通信的自干扰消除技术。该技术分为模拟自干扰消除和数字干扰消除。模拟自干扰消除指的是在射频接收端进行模拟信号的自干扰消除,数字干扰消除指的是在接收到信息后在数字域进行的自干扰消除。本文创新性的研究了影响模拟自干扰消除效果的信号幅度条件和相位条件,推导出了完整的公式,在现有模拟自干扰消除架构基础之上进行了改进,并设计出硬件电路进行实际验证,最终与全双工收发信机联合进行全双工通信测试,在2至3米的近距离条件下取的了较好的效果。本文还创新性的提出了基于功率测量和环路延迟计算的数字干扰消除算法,本算法比现有的数字滤波器数字干扰消除方法提升了将近5dB的自干扰消除效果。为今后的继续研究打下了良好的基础。
[Abstract]:With the development of wireless communication industry, the signal bandwidth used in wireless communication is becoming wider and wider, the demand for spectrum is increasing, but the corresponding spectrum resources are becoming less and less.At present, with the development of uplink and downlink in wireless communication from frequency division multiple access, time division multiple access to code division multiple access, people have been studying algorithms and techniques to save spectrum resources and maximize spectrum utilization.At this time, another research hotspot in wireless communication field to improve spectrum efficiency is simultaneous full duplex communication.At the same time, the most important core of full duplex communication is self-interference cancellation.In the simultaneous full-duplex communication, the information is transmitted and received at the same time. Because of the simultaneous transmission and reception, the power of the self-interference signal will be much larger than that of the other signal, which will cause serious interference to the receiving system.Not only the useful information is submerged in the strong self-interference signal resulting in the receiving data error, but also the low noise amplifier of the receiving link will be close to saturation, which will cause serious harm to the hardware of the receiving system.Therefore, in order to realize full duplex communication, self-interference cancellation must be carried out on the receiving link.This paper focuses on self-interference cancellation technology for simultaneous-frequency full-duplex communication.This technique is divided into analog self-interference cancellation and digital interference cancellation.Analog self-interference cancellation refers to the self-interference cancellation of analog signals at the RF receiver, and digital interference cancellation is the self-interference cancellation in the digital domain after receiving the information.In this paper, the signal amplitude and phase conditions that affect the simulation self-interference cancellation effect are studied innovatively, and the complete formula is deduced, which is improved on the basis of the existing analog self-interference cancellation architecture.The hardware circuit is designed for practical verification. Finally, the full-duplex communication test is carried out jointly with the full-duplex transceiver, and the result is better under the condition of 2 to 3 meters close distance.This paper also proposes an innovative digital interference cancellation algorithm based on power measurement and loop delay calculation. This algorithm improves the self-interference cancellation effect of nearly 5dB compared with the existing digital filter digital interference cancellation method.It lays a good foundation for further research.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92

【引证文献】