Blind Estimation of Spreading Code Sequence of QPSK-DSSS Signal Based on Fast-ICA

Author:

Xu Lu1,Liu Xiaxia1,Zhang Yijia1

Affiliation:

1. School of Information Science and Engineering, Zhejiang Sci-Tech University, No. 928, 2 Street, Hangzhou 310018, China

Abstract

Most of the existing estimation methods of spreading code sequence are not suitable for the QPSK-DSSS. We propose a spreading code sequence estimation method based on fast independent component analysis (Fast-ICA). It mainly includes signal preprocessing, calculations of separation matrix, and spreading code sequence. Firstly, the received signal is segmented according to the period of the spreading code sequence, and the covariance matrix can be calculated. Then, the signal subspace and corresponding eigenvalues are obtained by eigenvalue decomposition of the covariance matrix. Subsequently, the received signal matrix needs to be whitened. Finally, the Fast-ICA algorithm is used to find the separation matrix to estimate the in-phase and orthogonal spreading code sequence. The experiment result shows that the estimation of the spreading code sequence can be carried out based on Fast-ICA under a low SNR of −12 dB. Compared with the constant modulus algorithm (CMA) and the decomposition method for the real part of the self-covariance matrix (EVD-R), this method has a better performance.

Funder

the Natural Science Foundation of Zhejiang Province, China

Fundamental Research Funds of Zhejiang Sci-Tech University

Publisher

MDPI AG

Subject

Information Systems

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