Compressed sensing-based multi-period direct-spread MSK signal two-dimensional joint acquisition method

A technology of compressed sensing and joint capture, applied in transmission systems, electrical components, etc., can solve problems such as difficult balance

Inactive Publication Date: 2019-01-04
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, most of these methods are difficult to strike a balance between the Doppler estimation range and the estimation error

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  • Compressed sensing-based multi-period direct-spread MSK signal two-dimensional joint acquisition method
  • Compressed sensing-based multi-period direct-spread MSK signal two-dimensional joint acquisition method
  • Compressed sensing-based multi-period direct-spread MSK signal two-dimensional joint acquisition method

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with drawings and embodiments.

[0060] The invention is a multi-period direct spread MSK signal pseudo-code-Doppler joint acquisition method based on compressed sensing. Such as figure 1 Firstly, the A / D sampling of the received intermediate frequency direct spread MSK signal is performed, and then the approximate direct spread BPSK signal is obtained through the receiving conversion filter, frequency down conversion, low-pass filtering, and extraction, and then the approximate direct spread BPSK signal is sent to the compressed sensing Module, get the observation value, and then carry out the rough capture process, and the constructed redundant dictionary A 1 Do OMP reconstruction to obtain the precise estimation range of the code phase error and Doppler frequency offset; then narrow the Doppler estimation range, the observation value and the constructed redundant dictionary A 2 Do OMP reconstructi...

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Abstract

The invention discloses a compressed sensing-based multi-period direct-spread MSK signal two-dimensional joint acquisition method. According to the method, A / D sampling is performed on received intermediate-frequency direct-spread signals; after passing through a receiving and converting filter, sampled signals are converted into approximate direct-spread BPSK signals; the approximate direct-spread BPSK signals are subjected to down-conversion and low-pass filtering, so that direct-spread DSSH complex baseband signals are obtained; a sample point sequence of M symbol periods is selected from the signals so as to be adopted as an observation sequence, and local pseudo-codes are adopted to construct a joint sparse matrix; and an orthogonal matching pursuit algorithm is used to reconstruct compressed sensing signals, so that pseudo-code phase difference and Doppler frequency offset can be captured. The method of the invention has the advantages of simultaneous completion of pseudo code phase and Doppler frequency offset capture, large search range, high estimation precision, small error, and the like. The method of the invention is a novel two-dimensional capture method, is suitable for a high-dynamic low-signal to noise ratio application environment and has a high practical value.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and relates to intermediate frequency all-digital reception and pseudo code and Doppler frequency offset capture of a spread spectrum communication system, specifically, a two-dimensional joint capture of multi-period direct spread MSK signals based on compressed sensing method. Background technique [0002] At present, BPSK and QPSK modulation methods are mostly used in spread spectrum systems, but these two modulation methods cannot be applied to the application fields with severe nonlinear distortion, Doppler frequency shift and multipath fading. The direct spread MSK communication system has the advantages of low interception of the spread spectrum system, multi-user random site selection capability, strong anti-interference performance, constant envelope of the MSK signal, high spectrum utilization, energy concentration, fast sidelobe attenuation, and band With the advantages ...

Claims

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Application Information

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IPC IPC(8): H04B1/7077H04B1/7087H04B1/7075
CPCH04B1/7075H04B1/7077H04B1/7087
Inventor 谢仁宏袁小琦李鹏芮义斌郭山红张天乐陈颖
Owner NANJING UNIV OF SCI & TECH
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