Approach to blind estimation of the PN sequence in DS-SS signals with residual carrier

作者：Zhang, Tianqi^*; Dai, Shaosheng; Ma, Guoning; Zhang, Wei; Miao, Pu

来源：Journal of Systems Engineering and Electronics, 2010, 21(1): 1-8.

DOI：10.3969/j.issn.1004-4132.2010.01.001

• direct sequence spread spectrum (DS-SS) signal
• pseudo-noise (PN) sequence
• blind estimation
• singular value decomposition
• digital phase lock loop
• residual carrier

This paper presents an approach of singular value decomposition plus digital phase lock loop to solve the difficult problem of blind pseudo-noise (PN) sequence estimation in low signal to noise ratios (SNR) direct sequence spread spectrum (DS-SS) signals with residual carrier. This approach needs some given parameters, such as the period and code rate of PN sequence. The received signal is firstly sampled and divided into non-overlapping signal vectors according to a temporal window, whose duration is two periods of PN sequence. An autocorrelation matrix is then computed and accumulated by those signal vectors one by one. The PN sequence with residual carrier can be estimated by the principal eigenvector of the autocorrelation matrix. Further more, a digital phase lock loop is used to process the estimated PN sequence, it estimates and tracks the residual carrier and removes the residual carrier in the end. Theory analysis and computer simulation results show that this approach can effectively realize the PN sequence blind estimation from the input DS-SS signals with residual carrier in lower SNR.

• 出版日期2010-2
• 单位中国工程物理研究院; 重庆邮电大学; 中国科学院电工研究所