基于FFT的DSSS序列偶捕获  

Sequence Pairs Caught of DSSS Based on FFT

作　　者：刘连峰[1] 张福洪[1] 

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018

出　　处：《现代电子技术》2011年第17期129-131,共3页Modern Electronics Technique

摘　　要：在直接序列扩频通信中,接收端采用PN码进行解扩,所以PN码的选取十分重要,而序列偶就是一种PN码,可以用于猝发式直扩系统扩频解扩。采用基于FFT的伪码捕获技术,使用Matlab仿真实现DSSS系统中序列偶同步;通过对比序列偶与GOLD码和m序列,得到序列偶自相关性能优于GOLD码,当系统处于较大正弦波干扰时,它的误码率性能优于其他的PN码。高扩频比优于低扩频比,当信噪比大于8 dB时,误码率低于10-3以下,扩频增益越大,误码率越低。In the direct sequence spread spectrum communication, the PN code at launch and receiver which is used to solve code sync issues is very important in DSSS. The sequence pairs are a kind of PN code which can be used to DSSS. The FFT PN code capture technology is used and Matlab simulation is adopted to realize sequence pairs synchronous experiment in the DSSS system. Comparing the sequence pairs with the GOLD code and m sequence, the autocorrelation of sequence pairs is superior to that of GOLD code; when the sinusoid amplitude is large, the BER of the DSSS based on sequence pairs is better than that of other PN code. When the signal-to-noise ratio is more than 8 dB, the BER is lower than 10e-3 below, the spread spectrum gain is greater, the BER is lower.

关 键 词：序列偶 M序列 GOLD码 DSSS BER PN码同步 

分 类 号：TN914.42[电子电信—通信与信息系统]