Blind Estimation of Pseudo-Code Sequence of QPSK-DSSS Signal with Residual Carrier

被引：0
作者：
Chen X. [1 ]
Zhang T. [1 ]
Meng Y. [1 ]
Wang X. [1 ]
机构：
[1] School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing
来源：
Beijing Youdian Daxue Xuebao/Journal of Beijing University of Posts and Telecommunications | 2022年 / 45卷 / 03期
关键词：
Eigenvalue decomposition; Phase-locked loop; Pseudo-code sequence blind estimation; Quadrature phase shift keying; Spread spectrum communication;
D O I：
10.13190/j.jbupt.2021-181
中图分类号：
学科分类号：
摘要：
To solve the estimation difficulties of pseudo-code sequence of direct sequence spread spectrum (DSSS) signals with quadrature phase shift keying (QPSK) modulation with residual carrier, a method of pseudo-code sequence estimation is proposed based on signal correlation matrix eigendecomposition combined with all digital phase locked loop (DPLL). First, the received signal is sampled and segmented to obtain the data matrix. Then, the synchronization point of pseudo-code sequence is estimated by maximizing the spectral norm of signal correlation matrix. Based on synchronization, the characteristic subspace of signal correlation matrix is calculated. To eliminate the residual carrier of the eigenvector of the principal component and the phase change of π/2, a DPLL tracking and a residual carrie elimination are used to recover the pseudo-code sequence. The research results show that, for QPSK-DSSS signals, the proposed method can achieve blind pseudo-code sequence estimation under negative signal to noise ratio. © 2022, Editorial Department of Journal of Beijing University of Posts and Telecommunications. All right reserved.
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页码：90 / 95
页数：5
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