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Estimation and Compensation Method of Downlink Carrier Frequency Offset in LEO Satellite Multi-Carrier Communication System

A multi-carrier communication and low-orbit satellite technology, which is applied in the modulation carrier system, multi-frequency code system, transmission system, etc., can solve the problems of user terminals relying on ephemeris and high implementation complexity, and achieve reduced implementation complexity and uplink frequency. The effect of accurate bias estimates and reduced range

Active Publication Date: 2021-09-21
成都天奥集团有限公司
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AI Technical Summary

Problems solved by technology

[0010] In order to solve the low-orbit satellite multi-carrier communication system, the downlink carrier frequency offset estimation and compensation face problems such as high implementation complexity, the introduction of additional uplink compensation errors, and user terminals relying on ephemeris, etc., the present invention proposes a low-orbit satellite multi-carrier Carrier Frequency Offset Estimation and Compensation Method for Downlink in Carrier Communication System

Method used

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  • Estimation and Compensation Method of Downlink Carrier Frequency Offset in LEO Satellite Multi-Carrier Communication System
  • Estimation and Compensation Method of Downlink Carrier Frequency Offset in LEO Satellite Multi-Carrier Communication System
  • Estimation and Compensation Method of Downlink Carrier Frequency Offset in LEO Satellite Multi-Carrier Communication System

Examples

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specific example

[0040] refer to figure 2 , the specific example of the downlink carrier frequency offset estimation and compensation method is as follows:

[0041] Step 1: The gateway station estimates the frequency offset of the downlink common Doppler carrier based on the ephemeris, and uses the estimated value of the downlink common Doppler carrier frequency offset to precompensate the downlink transmit signal. Specifically, the gateway station calculates the Doppler carrier frequency offset of the downlink feeder link according to the ephemeris information, the location of the gateway station, and the carrier frequency of the downlink feeder link. refer to image 3 , the downlink feeder link Doppler carrier frequency offset f feeder，downlink is calculated as:

[0042]

[0043] in, is the carrier frequency of the downlink feeder link, is the connection direction between the satellite and the gateway station, is the velocity vector of the satellite, c is the speed of light;

...

specific Embodiment

[0058] The satellite flight altitude is 1175km, the satellite flight speed is 7.2km / s, the carrier frequency of the downlink user link is 20GHz, and the carrier frequency of the downlink feeder link is 40GHz; the elevation angle of the gateway station to the satellite is 5°, and the width of the satellite beam is 3°, the maximum elevation angle between the reference point of the cell and the satellite is 30°, and the user terminal is located at the edge of the cell. The real Doppler carrier frequency deviation of the downlink feeder link is 1040kHz, the Doppler carrier frequency deviation of the common part of the downlink user link is 350kHz, and the Doppler carrier frequency deviation between the user terminal and the cell reference point is -10kHz, Then the total downlink Doppler carrier frequency offset is 1380kHz.

[0059] According to step 1, the downlink common Doppler carrier frequency offset is calculated based on the ephemeris, and the typical calculation error is 1k...

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Abstract

The invention discloses a low-orbit satellite multi-carrier communication system downlink carrier frequency offset estimation and compensation method, which belongs to the field of satellite communication. The specific method of the present invention is (1) the gateway station estimates the frequency offset of the downlink common Doppler carrier based on the ephemeris, and uses the estimated value of the downlink common Doppler carrier frequency offset to pre-compensate the downlink transmission signal; (2) the user The terminal uses the downlink synchronization signal or the reference signal to estimate the frequency offset of the downlink residual carrier, and uses the estimated value of the downlink residual carrier frequency offset to compensate the downlink received signal. Utilizing the method of the present invention, the system can estimate and compensate the frequency offset of the downlink carrier with a relatively low implementation complexity when the user terminal has no ephemeris and only the gateway station has ephemeris, so as to meet the low-orbit satellite Doppler carrier Demodulation requirements for multi-carrier communication under frequency offset.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a method for estimating and compensating frequency offset of a downlink carrier in low-orbit satellite multi-carrier communication. [0002] technical background [0003] With the development of communication requirements, in order to meet the high-speed data transmission requirements in remote areas without base station coverage, in future mobile communications, communication coverage in remote areas through low-orbit satellites has become an important issue. A typical low-orbit satellite communication system such as figure 1 As shown, the system components include: (1) gateway station, (2) satellite, (3) user terminal. (2) The satellite is only responsible for transparent forwarding, that is, it only performs frequency shift forwarding processing on the received signal, and does not perform signal modulation and demodulation. The link between the gateway stati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0014H04L27/2657H04L2027/0026
Inventor 张毅刘田袁田谢伟夏斌徐元浩
Owner 成都天奥集团有限公司
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