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Low signal-to-noise ratio burst signal carrier synchronization method and system based on FLF algorithm

A carrier synchronization and burst signal technology, applied in phase modulation carrier system, modulated carrier system, transmission system, etc., can solve the problem of low signal-to-noise ratio carrier

Active Publication Date: 2021-02-05
中科南京移动通信与计算创新研究院
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  • Abstract
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Problems solved by technology

[0003] Purpose of the invention: to propose a low SNR burst signal carrier synchronization method based on the FLF (FFT-L&R-FFML) algorithm to solve the carrier synchronization problem of the receiver under the conditions of low SNR and large frequency offset of the satellite channel

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  • Low signal-to-noise ratio burst signal carrier synchronization method and system based on FLF algorithm
  • Low signal-to-noise ratio burst signal carrier synchronization method and system based on FLF algorithm
  • Low signal-to-noise ratio burst signal carrier synchronization method and system based on FLF algorithm

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Embodiment Construction

[0068] Such as figure 1 As shown, in this embodiment, a low SNR burst signal carrier synchronization method and system based on the FLF algorithm, including an improved FFT-based frequency offset coarse synchronization module, an L&R-based frequency offset fine synchronization module and an improved The FFML carrier phase offset synchronization module;

[0069] The improved coarse frequency offset estimation module based on the FFT frequency offset estimation algorithm uses the improved FFT-based frequency offset estimation algorithm for coarse frequency offset estimation, and sends the frequency offset value to the voltage-controlled Offset to the capture range of the fine synchronization algorithm;

[0070] The precise frequency offset estimation module based on the L&R algorithm uses the L&R algorithm for precise estimation of the frequency offset, and further restores the carrier frequency offset;

[0071] The improved phase synchronization module based on FFML algorithm...

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Abstract

The invention provides a low signal-to-noise ratio burst signal carrier synchronization method and system based on an FLF algorithm. The system comprises an improved FFT-based frequency offset coarsesynchronization module, an LR-based frequency offset fine synchronization module and an improved FFML carrier phase offset synchronization module. The frequency offset coarse synchronization module performs frequency offset coarse estimation by using an improved FFT-based frequency offset estimation algorithm, sends a frequency offset value to a voltage-controlled oscillator to realize frequency offset coarse recovery, and reduces the frequency offset to a fine synchronization algorithm capture range; the frequency offset fine synchronization module performs frequency offset fine estimation byusing an LR algorithm, and further recovers carrier frequency offset; and the carrier phase offset synchronization uses an improved FFML algorithm to perform phase synchronization so as to complete the whole carrier synchronization process.

Description

technical field [0001] The invention relates to a carrier synchronization technology for burst signals with low signal-to-noise ratio in satellite communication, which ensures that the burst receiver can perform carrier synchronization well under the conditions of low signal-to-noise ratio and large frequency deviation of satellite channels. Background technique [0002] The development of satellite technology and communication services has made great progress in satellite communication technology, and the standards of satellite communication are constantly advancing with the times. DVB_S2, as the second generation standard of satellite communication, is the standard adopted by most satellite communication systems in the world at present. DVB_S2 has the following characteristics: 1) On the basis of the original QPSK modulation, 8PSK, 16APSK, 32APSK modulation technologies are added. 2) The raised cosine roll-off coefficient has three optional parameters: 0.35, 0.25, and 0.2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/22H04L27/00H04B7/185
CPCH04L27/22H04L27/0014H04B7/18513H04L2027/0026
Inventor 徐喜梅王本庆王帅郭军平赵健施渊籍周一青石晶林
Owner 中科南京移动通信与计算创新研究院
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