Uplink Carrier Frequency Offset Estimation and Compensation Method for LEO Satellite Multi-Carrier Communication System

Abstract

The invention designs an uplink carrier frequency offset estimation and compensation method of a low-orbit satellite multi-carrier communication system, and belongs to the field of wireless communication. The uplink here refers to the transmission link transmitted by the user terminal, forwarded by the satellite, and received by the gateway station. The specific method is as follows: (1) The user terminal calculates the uplink pre-compensated carrier frequency offset value according to the estimated value of the downlink carrier frequency offset, and pre-compensates the uplink transmission signal; (2) The gateway station based on the ephemeris Estimate the Doppler carrier frequency offset, calculate the carrier frequency offset compensation value of the feeder link, and perform the first compensation for the uplink received signal; (3) The gateway station uses the uplink synchronization or reference signal to perform uplink residual carrier frequency offset Estimate and perform a second compensation on the uplink received signal. Utilizing the method of the present invention, the system can accurately estimate and compensate the uplink carrier frequency offset when the user terminal has no ephemeris and only the gateway station has ephemeris, and satisfies the requirement of multi-carrier communication under low-orbit satellite multi-Puller carrier frequency offset. demodulation request.

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 an uplink 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 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 s...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem that the uplink carrier frequency offset estimation and compensation of the low-orbit satellite multi-carrier communication system has large compensation errors and the user terminal depends on the ephemeris, the present invention proposes a low-orbit satellite multi-carrier communication system uplink carrier frequency Partial Estimation and Compensation Method

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