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Periodic long-short code direct sequence spread spectrum code division multiple access signal multi-pseudo-code estimation method

A technology of code division multiple access and long and short codes, which is applied in the field of multiple pseudo code estimation of period length and short code direct spread code division multiple access signals, and can solve the problem that the period length and short code direct spread code division multiple access signals cannot be estimated. , It is impossible to blindly estimate the cycle length and short code direct spread code division multiple access signal, etc., to achieve the effect of improving the estimation performance

Active Publication Date: 2016-06-15
浙江知多多网络科技有限公司
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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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  • Periodic long-short code direct sequence spread spectrum code division multiple access signal multi-pseudo-code estimation method
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  • Periodic long-short code direct sequence spread spectrum code division multiple access signal multi-pseudo-code estimation method

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Embodiment Construction

[0022] The implementation steps of the present invention will be further described in detail below.

[0023] Step 1, when the method for estimating multiple pseudo-codes of the cycle length and short code direct spread code division multiple access signal of the present invention is in use, at first the received cycle length short code direct spread code division multiple access signal is sampled with the spreading code chip rate, and converted For the baseband signal y(l):

[0024] y ( l ) = Σ k = 1 K A k d k ( l ) b k ( l ) c k ( l ) ...

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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 (DirectSequenceSpreadSpectrum, DSSS) is one of the main methods of spread spectrum communication technology. The core idea of ​​the direct spread communication system is to modulate...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707
CPCH04B1/707
Inventor 赵知劲李淼沈雷徐春云
Owner 浙江知多多网络科技有限公司
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