利用BCH码纠错和Fast-ICA的长码直扩CDMA信号扩频码盲估计  

Blind Estimation of Spread Spectrum Codes for LC-DS-CDMA Signals Based on BCH Code Error Correction and Fast-ICA

作　　者：尹辉 赵知劲[1] 姜显扬[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：《信号处理》2017年第11期1436-1442,共7页Journal of Signal Processing

基　　金：国家自然科学基金(61571172)

摘　　要：针对非合作通信中LC-DS-CDMA信号的扩频码盲估计问题,首先根据扩频增益对同步接收信号进行分段,利用Fast-ICA算法估计m序列扩频码片段;然后将估计得到的m序列片段排列组合进行拼接,利用m序列自相关特性对组合序列粗筛选,再利用m序列三阶相关特性进行精筛选;最后利用BCH码和m序列的等价原理对筛选后的组合序列进行纠错,纠错成功的序列即为扩频码序列。仿真结果验证了本文算法的有效性。Aiming at the problem of the spread spectrum codes blind estimation of the LC-DS-CDMA signal in non-cooperative communication, firstly, the synchronously received signal was segmented according to the spread gain which has been estimated in advance, and then the m sequence spread codes fragments were estimated based on Fast-ICA algorithm from the received signal fragments. Secondly, the estimated fragments were spliced into all possible sequences. Thirdly, the part of the combined sequences were removed roughly based on the autocorrelation of the m sequence, and then a small part of sequences were selected based on the triple correlation of the m sequence from the rest of the sequences. Finally, the equivalence principle between the BCH code and m sequences was used to correct the combined sequences. The successfully error-corrected sequences were the spreading code sequences and the sequence that has been corrected was the estimated sequence. The simulation results verify the effectiveness of the proposed algorithm.

关 键 词：长码扩频码分多址 Fast-ICA算法 BCH码纠错 三阶相关函数 

分 类 号：TN911[电子电信—通信与信息系统]