Pseudo-code Sequence Estimation Method Based on Linear Model
A composite signal and pseudo-code phase modulation technology, applied in baseband system components, electrical components, transmission systems, etc., to avoid bandwidth problems, improve monitoring and management, and broad application prospects
Active Publication Date: 2016-06-15
CHONGQING UNIV OF POSTS & TELECOMM
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[0004] The technical problem to be solved by the present invention is to set up a linear model of SFM signal, propose a method for PN code sequence estimation of PRBC-SFM composite signal based on this linear model, solve the difficult problem of PRBC-SFM signal pseudo-code sequence estimation, and overcome traditional methods Non-linear computing problems, while reducing the impact of noise on PN code sequence estimation, thereby improving the accuracy of PRBC-SFM composite signal PN code sequence estimation
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[0019] The present invention proposes a method for estimating a pseudo-code sequence of a pseudo-code phase-modulated composite signal based on the linear model of the SFM signal. The Jacobi-Anger (bessel function series expansion of the first kind) is performed on the SFM signal, and the nonlinear SFM (sine FM) signal model is transformed into a linear signal model, and the linear signal model is combined with the pseudo code phase modulation signal to obtain a composite signal based on the linear model. Specifically, the complex sinusoidal FM signal s(t)=Aexp{j[ω 0 t+m f sin(ω m t)]}, using Jacobi-Anger to further expand it into an exponential series with the Bessel function as the coefficient, that is It can be seen from this that the spectrum of the SFM signal contains infinite frequency components, and its frequency bandwidth is theoretically infinite, but it can be seen from the properties of the first k-order Bessel function, J k (m f The value of ) decreases with ...
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The invention provides a method for estimating the pseudo-code sequence of a pseudo-code phase modulation and sinusoidal frequency modulation (SFM) compound signal based on a linear module and belongs to the field of signal processing. The method comprises the following steps of carrying out Jacobi-Anger expansion on a sinusoidal frequency modulation signal, converting a nonlinear SFM (Sinusoidal Frequency Modulation) signal model into a linear signal model, acquiring the non-negative part of the linear signal according to the special symmetrical property of a Bessel function, and then compounding a pseudo-code phase modulation signal; adopting smooth pseudo Wigner distribution to carry out time-frequency analysis on the pseudo-code phase modulation compound signal, and combining an SVD (Singular Value Decomposition) subspace decomposition method to lower cross terms and noise; and determining the minimum tangent plane of an SPWVD (Smooth Pseudo Wigner-Ville Distribution) contour map processed by SVD denoising and enhancement along a frequency axis, and detecting peak value positions and phase jump information to finish accurate blind estimate on the PN code sequency of the pseudo-code phase modulation compound signal. The method has the advantages that PN (Pseudo Noise) codes can be accurately estimated under the condition of a low signal-to-noise ratio, so that the capability of improving management and interfering the pseudo-code phase modulation compound signal can be more effectively improved.
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technical field [0001] The invention relates to the technical field of signal processing, in particular to a linear model-based pseudo code (PN code) phase modulation sinusoidal frequency modulation (SFM) composite signal pseudo code sequence estimation. Background technique [0002] The parameter estimation method for the pseudo code phase modulation and sinusoidal frequency modulation composite signal (PRBC-SFM) is in the research stage, because the instantaneous frequency of the sinusoidal frequency modulation signal is a nonlinear function of time, and its spectrum contains infinite frequency components, that is, its The frequency bandwidth is very wide, and the pseudo-code phase modulation is used for composite modulation, which makes the parameter detection and estimation of this composite signal more complicated and difficult. At present, there is no literature to estimate the PN code sequence of the PRBC-SFM signal. For the PRBC-SFM composite signal, the estimation o...
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IPC IPC(8): H04L25/02H04B1/707
Inventor 张天骐白娟张刚邓灵李军伟潘毅杨超三
Owner CHONGQING UNIV OF POSTS & TELECOMM