Satellite communication adaptive coding modulation method based on link quality estimation

By using an adaptive coding and modulation method based on link quality estimation, the pilot insertion frequency and coding and modulation scheme are dynamically adjusted, which solves the problem of low efficiency of traditional adaptive coding and modulation schemes when the channel changes rapidly, and improves the spectral efficiency and reliability of satellite communication systems.

CN122316554APending Publication Date: 2026-06-30BEIJING INST OF TECH
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Patent Information

Application Number
CN202610494316.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-15
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional adaptive coding and modulation schemes are inefficient in scenarios with rapidly changing channel quality, and cannot achieve optimal combined performance of system throughput and reliability.

Method used

Using an adaptive coding and modulation method based on link quality estimation, the transmitter generates and sends a physical layer frame containing a pilot sequence. The receiver estimates the mean and variance of the channel signal-to-noise ratio, queries the joint decision table, determines the coding and modulation scheme and pilot insertion frequency for the next frame, and feeds it back to the transmitter to adjust the transmission strategy.

Benefits of technology

This system achieves optimal combined performance of system throughput and reliability when channel conditions change rapidly, improving the spectral efficiency and link robustness of satellite communications.

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Abstract

The invention provides a satellite communication adaptive coding modulation method based on link quality estimation, which relates to the field of satellite communication, and comprises the following steps: S1, a transmitting end generates and transmits a physical layer frame containing a pilot frequency sequence, and a receiving end receives the physical layer frame and extracts the pilot frequency sequence from the physical layer frame; estimating a mean value and a variance of a channel signal-to-noise ratio based on the extracted pilot frequency sequence and the sent pilot frequency sequence; and S2, a receiving end inquires a preset joint decision table according to the mean value and the variance of the channel signal-to-noise ratio estimated in the step S1, determines a coding modulation scheme and a pilot frequency insertion frequency adopted by a next frame, and feeds back the coding modulation scheme and the pilot frequency insertion frequency to a transmitting end to adjust a transmitting strategy. According to the method, the optimal combined performance of the throughput and the reliability of the system can still be realized when the channel state is rapidly changed.
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