扩展频谱通信系统处理增益的分析

Analysis of Processing Gain in Spread-Spectrum Communication System

近年来 ,扩频通信以它多种优越的性能在通信、导航、测量等领域迅速发展起来。扩频通信最重要的特性就是它的抗干扰性 ,因此从扩频通信的基本模型出发 ,计算了该系统对白噪声干扰、单频正弦干扰和其它扩频信号干扰的处理增益 ,分析了各种形式的干扰对于扩频通信接收机模型这一系统的影响 ,证明了系统的处理增益都与频谱扩展的倍数成正比 ,说明了对信号频谱扩展得越宽 ,处理增益越大 ,抗干扰能力越强。一些书中已经给出了处理增益的分析 ,但理论推导过于繁琐 ,还有个别错误之处。给出了简洁明了的证明 ,修正了某些错误。扩频通信是先进的通信技术 ,目前在石油化工系统应用较少 。

In recent years, because of its various superior properties, spread-spectrum communication has been developing rapidly in some areas such as communications, navigation, measurement, etc. The most important advantage is its inherent anti-interference capability. In this article, based on the mode of spread-spectrum communication, the processing gain of system to white noise interference, to single-sine interference and to other interference of spread-spectrum signals has been calculated, and the influence of various interference on the system model of spread-spectrum communication receiver also has been analyzed, that the processing gain of system varies proportionally to the times of spread of spectra has been proved, and it has been proved as well that the wider the spread spectrum signals is and the higher the processing gain is, the more powerful the anti-disturbance capability is. In some reference books, some calculations of processing gain had been made, but the theoretical deductions usually are t oo complex and even are incorrect. This article gives a brief proving and has corrected some errors. Spread-spectrum communications, which are not used in petrochemical industry widely, are advanced communication technology. We hope that this article will be helpful for giving impulse to the research of spread - spectrum communication for using it in petrochemical industries.