Long code DSSS signal blind estimation method

• 1、Harbin Engineering University,Harbin 150001

Abstract：Direct Sequence Spread Spectrum section (DSSS) communication technology as an important way of spreading, into decades in mobile communications, tactical communications, and remote telemetry, etc., has been successfully applied gradually. Direct Sequence Spread Spectrum for its anti-interference ability, confidentiality, and easy to implement multiple access communication, etc. And more and more attention has been paid, with the corresponding spreading code detection technology has become the focus of the current study. Non-cooperation through new, in a small amount of a priori conditions on the spreading code sequence is the entire communication system Estimation urgent problem. Therefore, the research environment at low SNR blind estimation of spreading sequences is of great significance. For blind long period spreading code sequence estimation, this study segmented cross-correlation algorithm based on this proposed blind based on the discrete cosine transform (DCT) estimation algorithms. This method first part of the signal matched filter (PMF), the output of the results using the DCT to reconstruct the signal energy saving while significantly reducing noise energy, the system detection performance at low SNR environment effectively upgrade.

Keywords： Direct Sequence Spread Spectrum PN code Discrete Cosine Transform Part of the matched filter Segmented cross-correlation