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Synchronous DS-CDMA signal pseudo code sequence and information sequence joint blind estimation based on ILSP-CMA

A technology of information sequence and pseudocode sequence, which is applied in the field of direct sequence spread spectrum communication signal processing, and can solve problems such as joint blind estimation of difficult forgery code sequence and information sequence

Inactive Publication Date: 2020-02-18
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose an estimation method based on the ILSP-CMA algorithm for the problem that it is difficult to jointly blindly estimate the pseudocode sequence and the information sequence under the low signal-to-noise ratio of the current DS-CDMA signal

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  • Synchronous DS-CDMA signal pseudo code sequence and information sequence joint blind estimation based on ILSP-CMA
  • Synchronous DS-CDMA signal pseudo code sequence and information sequence joint blind estimation based on ILSP-CMA
  • Synchronous DS-CDMA signal pseudo code sequence and information sequence joint blind estimation based on ILSP-CMA

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[0029] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0030] figure 1 Shown is the schematic flow chart of ILSP-CMA algorithm of the present invention, and concrete steps are as follows:

[0031] (1) Initialize H 0 ∈ R K×K , p=0, the convergence threshold is threshold;

[0032] (2) p=p+1, update B matrix: and put B p projection:

[0033] (3) Update the H matrix:

[0034] (4) calculation

[0035] (5) Determine to stop iteration when th is less than threshold (or reach the maximum number of iterations), otherwise repeat steps (2), (3) and (4).

[0036] Through the ILSP-CMA algorithm, the estimation of the information code sequence B can be finally obtained Estimate of H And get the signal amplitude of the kth user from it and the pseudocode sequence Estimates for: Among them, the subscript p represents the result of the pth iteration, and the symbol Repr...

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Abstract

The invention discloses synchronous DS-CDMA signal pseudo code sequence and information sequence joint blind estimation based on ILSP-CMA, and belongs to the technical field of signal processing. Themethod comprises steps of using known user number, constructing a received synchronous DS-CDMA signal model according to the pseudo code column period and the information code sequence period; carrying out eigenvalue decomposition on a covariance matrix of the signal; obtaining a corresponding feature vector, namely a signal subspace, projecting a received signal to the signal subspace, establishing a log-likelihood function model, and finally solving an information matrix and a pseudo code matrix by using an iterative least square projection constant modulus algorithm, thereby finally realizing joint blind estimation of a pseudo code sequence and an information sequence. According to the method, the pseudo code sequence and the information sequence of the synchronous DS-CDMA signal can beaccurately estimated under a relatively low signal-to-noise ratio, and the method is easy to operate and has important engineering practical significance.

Description

technical field [0001] The invention relates to direct sequence spread spectrum communication signal processing, in particular to a joint blind estimation method of synchronous DS-CDMA signal pseudocode sequence and information sequence based on iterative least square projection constant modulus (ILSP-CMA) algorithm. Background technique [0002] Direct Sequence Spread Spectrum (DSSS) communication signal is to use pseudo-code sequence (or called PN code) technology to expand the original narrow-band digital signal to a very wide spectrum range before transmission, so that the signal spectrum is broadened And reduce the power spectral density of the signal, it can work in the negative signal-to-noise ratio environment, that is, the signal is submerged in the noise, and has the advantages of strong anti-interference, anti-multipath, low probability of interception, multiple access multiplexing, etc., in the field of civil and military communications has been widely applied. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7073H04L1/00
CPCH04B1/70735H04L1/0038H04L1/005
Inventor 张天骐喻盛琪赵健根张刚李鑫凯
Owner CHONGQING UNIV OF POSTS & TELECOMM
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