重庆邮电大学学报（自然科学版）2016，Vol.28Issue(4)：468-472,5.DOI:10.3979/j.issn.1673-825X.2016.04.005
非合作直扩信号伪码及信息序列联合盲估计
Blind estimation of non-cooperative direct sequence spread spectrum signals and information sequence
摘要
Abstract
Blinding estimation combined spread-spectrum sequence with information sequence of DS-SS signals is studied. The chip rate of the Pseudo-Noise (PN)sequence and the PN sequence period need to be uncovered.Firstly,received sig-nal is sectioned with double pseudo-code cycle to construct the signal matrix,upon which singular value decomposition (SVD)is applied.Then information sequence is obtained by linear transformation of largest and secondary largest left sin-gular vectors ,PN sequence is worked out from largest right singular vector with the utilization of autocorrelation function. Without the knowledge of desynchronization time,the proposed method is able to estimate both the spread-spectrum se-quence and information sequence blindly.Meanwhile,it avoids solving the problem of the phase ambiguity when useing two vectors to reconstruct spread-spectrum sequence,which is based on EVD blinding estimate algorithm.Furthermore,the ambiguity at different desynchronization time is avoided by using linear transformation of matrix.The theoretical analysis and simulations show that,the proposed method can estimate PN sequence and information sequence effectively,and it has higher estimation accuracy and is not affected by the level of time delay.关键词
直接序列扩频信号/伪码序列/信息序列/奇异值分解Key words
direct sequence spread spectrum (DSSS)signal/pseudo noise sequence/information sequences/singular val-ue decomposition分类
信息技术与安全科学引用本文复制引用
强幸子,张天骐,赵军桃,王俊霞..非合作直扩信号伪码及信息序列联合盲估计[J].重庆邮电大学学报（自然科学版）,2016,28(4):468-472,5.基金项目
国家自然科学基金项目（61371164）；重庆市杰出青年基金项目（CSTC2011jjjq40002）；重庆市自然科学基金项目（CSTC2012JJA40008）；重庆市教育委员会科研项目（KJ130524） Foundation ItemsThe National Natural Science Foundation of China （61371164）；The Chongqing Distinguished Youth Foundation （CSTC2011jjjq40002）；The Natural Science Foundation of Chongqing （CSTC2012JJA40008）；The Research Project of Chongqing Ed-ucational Commission （）
