Downlink sampling frequency offset estimation and compensation method for low-earth-orbit satellite multi-carrier communication system

A technology of multi-carrier communication and sampling frequency offset, applied in the direction of modulated carrier system, multi-frequency code system, transmission system, etc. Partial estimation range is limited and other issues, to achieve a high range of demodulated signal-to-noise ratio, reduce implementation complexity, and reduce the effect of the range
CN110798422AActive Publication Date: 2020-02-14成都天奥集团有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
成都天奥集团有限公司
Publication Date
2020-02-14

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Abstract

The invention designs a downlink sampling frequency offset estimation and compensation method for a low-earth-orbit satellite multi-carrier communication system, and belongs to the field of wireless communication. A downlink refers to a transmission link which is transmitted by a gateway station, forwarded by a satellite and received by a user terminal. The specific method comprises the followingsteps that: a gateway station estimates downlink common Doppler sampling frequency offset based on ephemeris, and pre-compensates a downlink transmitting signal by using a downlink common Doppler sampling frequency offset estimation value and changing the sampling frequency of a sampling crystal oscillator or using a resampling digital filter; and a user terminal estimates a downlink residual sampling frequency offset by using the downlink synchronization signal and a segmentation correlation algorithm, and compensates a downlink receiving signal in a frequency domain by using a downlink residual sampling frequency offset estimation value. The downlink sampling frequency offset can be compensated with lower complexity and higher precision under the condition that the user terminal has noephemeris and only the gateway station has ephemeris, and the demodulation requirement of multi-carrier communication under the large sampling frequency offset of a low-earth-orbit satellite is met.
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Description

technical field

[0001] The invention belongs to the field of wireless communication, and in particular relates to a downlink sampling frequency offset estimation and compensation method 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 in remote areas without base station coverage, in the future mobile communication, it has become an important issue to achieve communication coverage for remote areas through low-orbit satellites. 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 station ...

Claims

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