施意+鲍凯+张爽+徐松岩
摘 要: 脉冲噪声由于其冲击能量和幅度较大,会对通信系统接收机产生严重影响,为了提高通信系统接收机的性能,必须对混有脉冲噪声的接收信号进行处理,需要改进接收机。以MSK信号为例,通过对改进后的接收机性能仿真,验证了采用非线性自适应处理器改进通信接收机的可行性。
关键词: 通信接收机; 脉冲噪声; 非线性处理; 误差处理
中图分类号: TN911.7?34 文献标识码: A 文章编号: 1004?373X(2014)15?0068?02
An improved nonlinear impulsive noise processing receiver
and its performance simulation
SHI Yi1, BAO Kai1, ZHANG Shuang2, XU Song?yan1
(1. Department of Voyage Observation and Communication, Navy Submarine Academy, Qingdao 266042, China;
2. Communication Office, Unit 68306 of PLA, Xian 710608, China)
Abstract: Impulse noise, due to its high impact energy and large amplitude, has a serious impact on the communication system receiver. The received signal mixed with impulse noise must be processed so as to improve the performance of the communication system receiver. Taking MSK signal as an example, performance simulation of the modified receiver verified the feasibility of adopting the nonlinear adaptive processor to modify communication receivers.
Keywords: communication receiver; impulse noise; nonlinear processing; error processing
通信系统主要受到脉冲噪声的影响,在脉冲噪声干扰严重的情况下,系统接收机的误码率较高,无法正常接收报文,要有效提高接收机的接收性能就必须对接收机进行改进。收信时,接收到的信号是混杂了噪声干扰的MSK信号,将MSK信号从噪声干扰中提取出来的主要方法是在接收系统的滤波器前端或后端添加信号处理器。目前已经出现了许多脉冲噪声抑制方法,其中应用最广泛的主要有以下几种:带通滤波器,限幅器,非线性自适应处理器。本文使用了一种基于自适应信号处理技术的非线性自适应处理器对接收机中混有脉冲噪声的信号进行抑制处理。
1 非线性处理器设计
非线性自适应处理器的原型是自适应波形预测器,它使用两组单频正弦信号作为线性组合器的输入信号,不断地调整权向量来合成一个模拟的MSK信号。正弦信号的频率是载波的中心频,两组信号的相位差为[π2,]每一个采样时刻的输出信号都是它们的线性组合,但是需要调整权值来使输出信号逼近MSK信号。……