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A Coarse Estimation Method of Frequency Offset Adapting to Low SNR and High Dynamic Environment

A technology for rough estimation of frequency offset and high dynamic environment, applied in the field of rough estimation of frequency offset, it can solve the problems such as the estimation function cannot work normally, the known data rate is reduced, etc., to achieve a good rough estimation effect, simplify the implementation complexity and dynamic range. big effect

Active Publication Date: 2021-12-07
XIAN INSTITUE OF SPACE RADIO TECH
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AI Technical Summary

Problems solved by technology

The data-assisted method usually uses pilots (or physical frame headers, unique words, etc.) to estimate the frequency offset. However, in the application background of this scene, the frame structure uses the method of inserting pilots at intervals to deal with the problem of rotor occlusion. As a result, the rate of known data is greatly reduced, combined with its own highly dynamic application environment, it is completely beyond the range of frequency offset estimation by data-assisted methods
For the traditional blind estimation method, the estimation function usually cannot work properly under such a low signal-to-noise ratio

Method used

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  • A Coarse Estimation Method of Frequency Offset Adapting to Low SNR and High Dynamic Environment
  • A Coarse Estimation Method of Frequency Offset Adapting to Low SNR and High Dynamic Environment
  • A Coarse Estimation Method of Frequency Offset Adapting to Low SNR and High Dynamic Environment

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Embodiment Construction

[0038] A method for roughly estimating frequency offset adapted to low signal-to-noise ratio and high dynamic environment, comprising the following steps:

[0039] (1) Using the shaping factor of the shaping filter pre-specified in the communication system to obtain its amplitude-frequency characteristics;

[0040] (2) Calculate the amplitude-frequency characteristics of the signal received by the receiver;

[0041] (3) Calculate the correlation value of the two, and the frequency offset at the maximum correlation value is the rough estimation result of the frequency offset.

[0042] The shaping factor of the shaping filter pre-specified in the communication system is common known information in the communication system, and both the sending and receiving parties know this information.

[0043] In the step (1), the amplitude-frequency characteristic is obtained by utilizing the shaping factor of the pre-specified shaping filter in the communication system, including:

[0044...

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Abstract

The invention relates to a rough estimation method of frequency offset adapted to low signal-to-noise ratio and high dynamic environment, which belongs to the technical field of communication. The present invention obtains its amplitude-frequency characteristic through the shaping factor of the pre-specified shaping filter in the communication system, and then obtains its amplitude-frequency characteristic for the signal received by the receiver. The corresponding frequency, the frequency value is the result of the rough estimation of the frequency offset at this time. This method is a blind frequency offset estimation method, which can generally be used as the first stage of receiver baseband signal processing. After the frequency offset is roughly estimated and compensated, the residual frequency offset of the received signal can be greatly reduced, and the subsequent implementation complexity can be fully simplified. Compared with the prior art, the coarse frequency offset estimation method realized by the present invention requires less preconditions, has a low adaptive signal-to-noise ratio, has a large dynamic range, has very wide application scenarios, and has good use value.

Description

technical field [0001] The invention relates to a rough frequency offset estimation method adapted to a low signal-to-noise ratio and high dynamic environment, and belongs to the technical field of communication. Background technique [0002] Satellite mobile communication has the characteristics of high dynamics and low signal-to-noise ratio, which leads to the existence of multi-Puller frequency deviation and high-order frequency change rate in satellite communication signals, which brings difficulties to signal synchronization and demodulation. In satellite mobile communication, due to the fast relative motion between the satellite and the communication terminal, a large Doppler frequency deviation is brought; at the same time, subject to the capabilities of the satellite and the terminal, the symbol rate in mobile satellite communication is often low. The result of the combination of the two leads to the fact that in satellite mobile communication, the Doppler frequency ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 刘明洋龚险峰王大庆惠腾飞张剑吴桐
Owner XIAN INSTITUE OF SPACE RADIO TECH
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