扩频通信中的扩频函数

扩频通信系统的频谱扩展是借助于扩频函数而实现的 ,典型的扩频函数就是伪随机序列码 ,实用的伪随机码必须是具有随机性 ,有尖锐的自相关特性 ,有较小的互相关值 ,要有较多的序列数 ,同时 ,还要求系列平衡 ,易于实现等特点。M序列和Gold序列伪随机码满足以上条件 ,是应用广泛的扩频函数。介绍了这两个随机码的原理、性能和构造方法及由本原多项式和递推公式用计算机产生、计算和组成序列集的方法及方法简练 ,适合工程技术人员参考。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 ,扩频通信是先进的通信技术 ,目前在石油化工系统应用较少 ,但是该论述有助于推动扩频通信在石油化工系统中的应用研究

Spread-Spectrum Function of Spread-Spectrum Communication System

Spread-spectrum communication system uses the spread-spectrum function to implement spectra expanding. The typical spread-spectrum function is pseudo-noise sequence code. The practical pseudo-noise sequence code must have the quality of randomness and sharp autocorrelation,little cross correlation value and much set value, serial balance and easy to be achieved are also necessary. Set M and set Gold of pseudo-random code meet requirements listed above, thus are widely used as spread-spectrum functions. The principle, property and construction method of these two code were introduced. The method to produce, calculate and form sequence set by using computer based on original multinomial and recursion formula. This simple method is convenient for engineer to refer to. 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. Spread-spectrum communications, which are not used in petrochemical industries widely, are advanced communication technology. This article will be helpful for giving impulse to the research of spread-spectrum communication used in petrochemical industries.