Pseudo-code Estimation Method for Non-Periodic Long Code Direct Spread Signal

Abstract

The invention relates to an aperiodic long code direct sequence spread spectrum signal pseudo code estimation method. The existing direct sequence spread spectrum signal pseudo code estimation technology cannot be applied to receive aperiodic long code direct sequence spread spectrum signals with signal length less than a long code period. The aperiodic long code direct sequence spread spectrum signal pseudo code estimation method comprises the steps of: calculating a triple correlation function of the aperiodic long code direct sequence spread spectrum signal; constructing a binary hypothesis testing model and a probability distribution function for detecting a triple correlation peak, and achieving coarse extraction and fine detection of the triple correlation peak through circulating mean removal processing and goodness-of-fit detection; and finally estimating a primitive polynomial of a long pseudo code m sequence of the signal by utilizing the extracted triple correlation peak. According to the aperiodic long code direct sequence spread spectrum signal pseudo code estimation method, based on the fundamental principle that the greatest common divisor of the polynomial corresponding to the m sequence of triple correlation peak is the primitive polynomial of the m sequence, the triple correlation peak can be extracted more accurately through circulating mean removal processing and goodness-of-fit detection, and the pseudo code blind estimation of the aperiodic long code direct sequence spread spectrum signals can be realized.

Description

technical field [0001] The invention belongs to the field of blind parameter estimation of direct-sequence spread-spectrum signals in communication countermeasures, and in particular relates to a pseudo-code estimation method for non-periodic long-code direct-spread signals under non-cooperative communication conditions. Background technique [0002] Direct Sequence Spread Spectrum (DSSS) is a widely used spread spectrum system, which has the advantages of anti-jamming, anti-multipath, security and code division multiple access, and has been widely used in military, navigation and civil communications. widely used. One long code period of aperiodic long code direct spread signal modulates multiple information symbols, the structure is complex, and the number of received samples is less than one long code period, which makes it difficult to estimate the aperiodic long code direct spread signal by traditional spreading code estimation methods. Pseudo-random codes (referred to...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the pseudo code of the non-periodic long code direct spread signal cannot be estimated in non-cooperative communication, and propose a non-periodic long code direct spread based on cyclic mean value processing, goodness of fit test and third-order correlation Signal pseudo-code estimation method, thus solving the problem of pseudo-code blind estimation of non-periodic long code direct spread signal

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