A Novel Cyclic-Moment Based Method for DS-SS QPSK Signal Blind Parameter Estimation  

作　　者：JIN Yan JI Hongbing 

机构地区：[1]School of Electronic Engineering, Xidian University, Xi ＇ an 710071, China

出　　处：《Chinese Journal of Electronics》2011年第4期686-690,共5页电子学报（英文版）

基　　金：This work is supported by the Basic Science Research Fund in Xidian University （No.JY10000902037） and the National Natural Science Foundation of China （No.60871074）.

摘　　要：The parameter estimation of Direct sequence spread spectrum （DS-SS） signals with QPSK modulation under non-cooperative conditions is considered. The explicit expressions of both the third- and the fourth-order cyclie-moments of QPSK signals are derived, and the cycle frequency structure corresponding to the second- and fourth-order cycllc-moment of DS-SS （Direct sequence spread spectrum） QPSK signals is deduced. A novel parameter estimation method is proposed by combining the second- and the fourth-order cyclic-moments, which can perform blind parameter estimation without a pri-ori knowledge of pseudorandom sequence and frequency parameters. Moreover, the method which employs one-dimensional slices, also avoids multi-dimensional searching. Simulation results are presented to confirm the validity of the method.

关 键 词：Direct sequence spread spectrum （DS- SS） QPSK Parameter estimation Cyclic-moment Cyclostationary. 

分 类 号：TN911.3[电子电信—通信与信息系统] O211.67[电子电信—信息与通信工程]