可变址WOCDMA编解码器的设计  

Design of address-changeable WOCDMA encoder/decoder

作　　者：解宜原[1] 荣健[1] 

机构地区：[1]西南交通大学理学院,四川成都610031

出　　处：《光电工程》2005年第6期51-54,共4页Opto-Electronic Engineering

摘　　要：以EQC编码为基础,利用素数跳频技术,提出一种三维无线光CDMA编码方案。这种编码方案使码重为p的EQC码的容量提高了p2(p-1)2倍,互相关峰值仍为2,自相关旁瓣峰值仍为1。利用法拉第效应和光纤光栅技术设计了编解码器,由于光纤光栅和旋光器的空间位置不同,则光脉冲经过的距离不同,所以每个光脉冲的时间延迟不同,则不同偏振,不同波长的光脉冲在时域上分离,并利用压电陶瓷控制光栅的中心波长和可调谐磁场强度来控制旋光器中偏振方向,实现灵活变址。Based on EQC coding, a 3-D wireless optical CDMA coding scheme using prime frequency hopping is proposed in the paper. For this coding scheme, the volume of EQC code is improved by a factor of p2(p-1)2 when code weight is p. The peak of cross-correlation is still 2 and autocorrelation sidelobe peak is still 1. The decoder/encoder is designed according to the principle of Faraday effect and fiber grating. Since the Faraday rotation's position is different from that of Fiber grating, the travel distance of light pulse is different and the time delay of each light pulse is also different. The light pulse with different polarization states and different wavelengths will be separated in time domain. Using piezoelectric ceramics to control wavelength and using Faraday rotation to control polarization aspect, The address-changeable encoder/decoder is devised. The Fiber grating's central wavelength can be controlled by PZT and the polarization direction of the polarimeter can be controlled by Faraday rotation, thus address-changeable encoder/decoder can be implemented.

关 键 词：EQC编码 无线光码多分址 跳频 法拉第效应 编解码器 

分 类 号：TN914[电子电信—通信与信息系统]