Multiple Pseudo Code Estimation Method for Direct Spread Code Division Multiple Access Signals with Period Length and Short Codes

Abstract

The invention relates to a periodic long-short code direct sequence spread spectrum code division multiple access signal multi-pseudo-code estimation method. The existing direct sequence spread spectrum code division multiple access signal pseudo code blind estimation technology cannot be applied to periodic long-short code direct sequence spread spectrum code division multiple access signals adopting short code spread spectrum and long code scrambling. The method comprises the steps of: constructing periodic long-short code direct sequence spread spectrum code division multiple access signals with complicated structures into a deficit matrix model of short code direct sequence spread spectrum code division multiple access signals, and modeling compound code matrix estimation as a blind source signal separation problem; applying a matrix filling theory to the compound code matrix estimation, and estimating user compound code sequences based on a singular value threshold algorithm and a fast independent component analysis algorithm; and finally proposing a delay triple correlation algorithm by utilizing a displacement stacking feature of an m sequence, and estimating long-short pseudo code sequences contained in the user compound code sequences. The periodic long-short code direct sequence spread spectrum code division multiple access signal multi-pseudo-code estimation method fully utilizes the matrix filling mathematic model and the triple correlation peak feature of the m sequence, and achieves blind estimation of the user compound code sequences, a long scrambling code sequence and a short spread spectrum code sequence of the signals.

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 method for estimating multiple pseudocodes of cycle length short code direct spread code division multiple access signals using short code spread spectrum and long code scrambled. Background technique [0002] Conventional communication systems mainly use limited signal power and bandwidth to transmit as much information as possible. Spread spectrum communication is a communication in which data is transmitted on a bandwidth much larger than the information rate. Because it does not aim at saving bandwidth, it is different from conventional communication systems. [0003] Direct Sequence Spread Spectrum (DSSS) is one of the main methods of spread spectrum communication technology. The core idea of ​​the direct spread communication system is to modulate the signal with a high-rate p...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of blindly estimating the pseudo-codes of each user of the period-length-short-code direct-spread CDMA signal in non-cooperative communication, and propose a period-length-short-code direct-spread CDMA based on matrix filling and third-order correlation Address signal multi-pseudo-code blind estimation method, so as to solve the problem that it is impossible to estimate the period length and short code direct spread code division multiple access signal multi-pseudo-code problem for each user

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