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Coding CPM signal frequency offset estimation and correction method based on waveform matching

A waveform matching and frequency offset estimation technology, which is applied in multi-frequency code systems, modulated carrier systems, digital transmission systems, etc., and can solve the problems of large residual frequency offset, demodulation performance loss, and large variance of frequency offset estimation algorithm.

Active Publication Date: 2020-10-20
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

However, when the above method is used for non-coherent demodulation, due to the large variance of the frequency offset estimation algorithm, there is a large residual frequency offset after carrier correction, and the non-coherent receiver does not have a phase-locked loop for carrier phase compensation, resulting in a certain Demodulation performance loss

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  • Coding CPM signal frequency offset estimation and correction method based on waveform matching
  • Coding CPM signal frequency offset estimation and correction method based on waveform matching
  • Coding CPM signal frequency offset estimation and correction method based on waveform matching

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Embodiment Construction

[0045]The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0046] The invention relates to a method for estimating and correcting the frequency offset of a coded CPM signal based on waveform matching. The frequency offset estimation of the CPM received signal is carried out by using the method of correlation matching between the channel coding frame header waveform and the waveform of the received signal. Compared with the traditional method based on FFT spectrum characteristics Frequency offset estimation method, the method given by the invention can obtain frequency offset estimation performance closer to the modified Cramereau boundary and faster convergence speed, and is very suitable for non-coherent coded CPM receivers sensitive to residual frequency offset, and can obtain Better bit error performance than traditional frequency offset correction methods.

[0047] The present invention p...

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Abstract

The invention discloses a coding CPM signal frequency offset estimation and correction method based on waveform matching, and relates to the technical field of wireless measurement and control communication. According to the invention, the frequency offset estimation of the CPM receiving signal is carried out by adopting a method of correlatively matching the channel coding frame header waveform with the receiving signal waveform. Compared with a traditional frequency offset estimation method based on FFT frequency spectrum characteristics, the frequency offset estimation performance closer tothe corrected Cramer-Rao bound and the higher convergence speed can be obtained, the method is very suitable for an incoherent coding CPM receiver sensitive to residual frequency offset, and the error code performance better than that of a traditional frequency offset correction method can be obtained.

Description

technical field [0001] The present invention relates to the technical field of wireless measurement and control communication, in particular to a method for estimating and correcting frequency offset of coded CPM signals based on waveform matching. Background technique [0002] CPM (Continuous Phase Modulation, continuous phase modulation) signal is a new measurement and control communication signal modulation system, which has the advantages of continuous phase, constant envelope and high bandwidth, and has received extensive attention and a lot of research. A special case of CPM signal, Multi-h CPM (Multi-modulation index CPM), adopts multiple modulation indices that change cyclically, the concealment of the modulated signal is better, the power spectrum is more concentrated, the side lobe attenuation is faster, and the bandwidth efficiency is further improved. It is more advantageous in bandwidth-limited channels; CPM signals have phase continuity and recursive characteri...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2647H04L27/2649
Inventor 周锞谢顺钦李湘鲁解楠代涛俞平原王明邝文杨大龙王剑
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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