导　　师： 陈南

学科专业： 081001

授予学位： 硕士

作　　者： ;

机构地区： 西安电子科技大学

摘　　要： 随着无线传输的发展,人们对无线传输中信号质量的要求越来越高,这就要求进一步提高通信系统的信噪比。噪声按其来源可分为人为噪声、自然噪声和内部噪声。提高系统的信噪比的方法很多,抑制噪声是一种常用的方法。其中人为噪声种类繁多,也相对复杂。如果能有效地抑制人为噪声,就可以大大的提高系统的信噪比。 本文介绍的V//UHF波段的干扰抵消系统就是从抑制人为噪声的角度来提高系统的信噪比,主要通过抑制本地大功率信号通过多径传播从发射天线耦合到本地接收天线的同址干扰信号。此干扰抵消系统抵消的同址干扰信号具有瞬时窄带特性,覆盖频率在V//UHF波段。根据干扰的特点和自适应正交矢量合成干扰抵消原理,设计了干扰抵消系统相关模块。 本文主要介绍了干扰抵消器中的电调衰减器、宽带相关器、宽带功率合成器、控制器。并分析了各模块的原理,而后制定了相应设计方案,设计了各个模块硬件实现,最后测试了各模块和整机的性能,并对测试结果进行了分析。总结了经验和不足,为后续工作奠定基础。 With the rapidly developing of wireless transmission, the requirements for signal quality in wireless transmission are more and more stricter. It is essential to eliminate all kinds of interferences in transmission channel to improve Signal-to-Noise Ratio /(SNR/). There are man-made noise, natural noise and internal noise according to its origin, and man-made noise is the most complex and various. Noise abatement is one of methods to to improve the SNR. Great improvement of the SNR can be made if we can restrain the man-made noise effectively. This paper describes an interference cancellation system which operates on V//UHF. The interference canceller can improve SNR via eliminating man-made noise in wireless channel. The interference cancellation system can improve rejection of interference signal with the site coupled from a transmission antenna into a local receive antenna in the presence of local multi-path. The interference has an instantaneously limited bandwidth communication channel operating over V//UHF. The interference cancellation system is designed based on characteristic of interferences and principium of self-adaptive Orthogonal vector synthesis. This paper mainly focuses on parts of interference cancellation system modules, such as electrically controlled attenuator, broadband correlator, broadband power combiner and controller, then analyzes the theory of modules, proposes applicable solutions based on the theory and designed the corresponding hardware implementations, at last makes same performance tests and discuss the results. There are also advantages and disadvantages, so the approach in this paper serves as a foundation for the work in the future.

关 键 词： 干扰抵消 正交合成 自适应滤波 衰减器 相关器

领　　域： [电子电信] [电子电信]