MPSK signal carrier frequency estimation method based on Rife-Quinn synthesis
A frequency estimation and signal technology, applied in the field of signal processing, can solve problems such as high algorithm complexity, difficult engineering practice, and increased algorithm computation
Active Publication Date: 2019-02-22
SOUTHEAST UNIV
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The carrier frequency estimation method based on spectral correlation can also estimate the carrier frequency and code rate of the signal at the same time under low signal-to-noise ratio and has strong anti-interference ability, but this method can only directly estimate the carrier frequency of BPSK signal, other The carrier frequency of the MPSK signal needs to be transformed nonlinearly before using this method to estimate the carrier frequency. In addition, the algorithm complexity of calculating the signal spectral correlation function is relatively large. When estimating the signal carrier frequency, it is necessary to estimate the signal carrier frequency on the two-dimensional plane of the spectral correlation function. Searching for spectral peaks further increases the computational complexity of the algorithm, making it difficult to use in engineering practice
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[0057] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0058] as attached figure 1 Shown, a kind of MPSK signal carrier frequency estimation method based on Rife-Quinn synthesis of the present invention comprises the following steps:
[0059] S10. Acquire a sample data sequence of the MPSK signal to be processed.
[0060] Receive the real-time acquisition data of N sampling points from the sensor as the MPSK signal data sequence x(n) to be processed, n=0,1,...,N-1, or extract from the memory starting from the time when the signal is detected The data of the N sampling points is regarded as the MPSK signal data sequence x(n) to be processed, n=0,1,...,N-1, and the sampling frequency of the signal is recorded as f s .
[0061] S20. Transform the MPSK signal carrier frequency estimation problem into a CW signal frequency estimation problem by performing multiple square transformations on the MPSK ...
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The invention discloses an MPSK signal carrier frequency estimation method based on Rife-Quinn synthesis, comprising the following steps: S10, acquiring a to-be-processed MPSK signal sampling data sequence; S20, performing quadratic transformation on an MPSK signal for multiple times and removing a direct current component of the MPSK signal, so that an MPSK signal carrier frequency estimation problem is converted into a CW signal frequency estimation problem; S30, performing frequency estimation on a CW signal by using a Rife interpolation algorithm, and when signal spectrum leakage after estimation becomes larger, correcting a Rife interpolation direction by using a Quinn interpolation algorithm; and S40, according to a frequency estimated value of the CW signal, calculating an MPSK signal carrier frequency. Compared with the traditional Rife interpolation and Quinn interpolation, the method disclosed by the invention can accurately estimate the MPSK signal carrier frequency under the conditions of a small signal data size and a low signal-to-noise ratio environment and is applicable to performing quick robust estimation on the MPSK signal carrier frequency in engineering.
Description
technical field [0001] The invention belongs to the field of signal processing, in particular to a method for estimating carrier frequency of MPSK signals based on Rife-Quinn synthesis. Background technique [0002] MPSK (Multiple Phase Shift Keying) signal is a multi-ary phase shift keying signal. Due to its good anti-noise performance, this type of signal is widely used in the field of air and underwater communication. Therefore, for non-cooperative MPSK signals Reconnaissance and parameter estimation have important military significance, and the accurate estimation of MPSK signal carrier frequency is the premise that many other signal parameters can be estimated. At present, the commonly used MPSK signal carrier frequency estimation methods mainly include wavelet transform method, spectral correlation method and square transform law etc. [0003] The carrier frequency estimation method based on wavelet transform can estimate the carrier frequency and code rate of the sig...
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IPC IPC(8): H04L27/00H04L27/22
CPCH04L27/0014H04L27/22H04L2027/0024
Inventor 方世良魏阳杰刘清宇王晓燕
Owner SOUTHEAST UNIV
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