Adaptive timing synchronization for burst and continuous signal reception

By employing an adaptive timing synchronization method, utilizing a replacement value provider and freeze signal generation, the problem of rapid resynchronization and offset compensation for terminal equipment in hopping beam satellite communication systems is solved, improving synchronization accuracy and processing efficiency, and adapting to broadband communication requirements.

CN115665845BActive Publication Date: 2026-06-09FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV
Filing Date
2018-09-10
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In hopping beam satellite communication systems, terminal equipment faces the challenge of accurate timing synchronization, especially the problem of rapid resynchronization at the start and end of beam illumination. Existing technologies struggle to effectively address unexpected symbol offsets and reliable detection of illumination start/end, leading to data demodulation errors and high processing complexity.

Method used

An adaptive timing synchronization method is adopted. By calculating an accurate replacement value at the input of the numerically controlled oscillator (NCO), combined with a freeze signal generation and data frame synchronization auxiliary module, rapid resynchronization and offset compensation are achieved. Power level detection and known sequence detection are used to adaptively switch freeze control, and a replacement value provider is used to smooth timing error information and enhance open-loop accuracy.

Benefits of technology

It improves the timing synchronization accuracy of terminal devices in different communication scenarios, reduces data demodulation errors, reduces processing complexity and power consumption, and adapts to the high data throughput requirements of broadband communication.

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Abstract

Examples of a receiver, a controller unit (e.g., for a receiver), and related methods (e.g., for a receiver) are provided. A receiver is provided that includes a tunable sample provider configured to provide samples of an input signal using tunable sample timing, a feedback path configured to provide a feedback signal to the tunable sample provider based on a timing error, wherein the feedback path includes a loop filter configured to provide sample timing information to the tunable sample provider, and a replacement value provider configured to provide replacement sample timing information that replaces the sample timing information provided by the feedback path when the input signal does not satisfy predetermined requirements for feedback-based sample timing adjustment, wherein the replacement value provider is configured to provide the replacement sample timing information taking into account timing error information or a quantity derived from the timing error information over a longer period of time than a period of time taken into account by the loop filter for providing the sample timing information.
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