Method for synchronizing DVB-S2 system receiver full-mode physical layer frame

Abstract

The invention belongs to the technical field of digital communication and transmission synchronization, in particular relates to a method for synchronizing a DVB-S2 system receiver full-mode physical layer frame. The invention fully utilizes the characteristics of a physical layer frame structure, after carrying out differential relevant processing, the information obtained by extracting 90 signs of a frame header after pilot frequency information is extracted in a pilot frequency mode and the information obtained by extracting 90 signs of the frame header in a non-pilot frequency mode enter parallel sliding peak value detection windows; when the peak value detection judgment is carried out in each window, a double-peak value detection scheme is introduced, and the corresponding judgment is made. The invention can accelerate the speed of the frame synchronization capturing frame header, obviously improve the performance of frame synchronization relevant peaks when a system is operated in low signal-to-noise ratio and larger frequency deviation and accurately give frame synchronization and initial position information, and in addition, a multiplier during differential relevant processing is replaced by a simple control exchange unit so as to lead the method to have lower complexity.

Description

technical field [0001] The invention belongs to the technical field of digital communication transmission synchronization, and in particular relates to a method for synchronizing frames of a full-mode physical layer of a DVB-S2 (second-generation satellite digital video broadcasting) system receiver. Background technique [0002] In recent years, wireless satellite broadcast communication has received extensive attention. DVB-S2 system is approved by ETSI to replace DVB-S (the first generation satellite digital video broadcasting) and become the second generation digital satellite broadcasting standard in Europe with its excellent performance close to the Shannon limit and higher spectrum utilization rate. It has been recognized and adopted by many other countries and regions in the world. Algorithms and implementation researches for this standard receiver have become a hot spot in satellite broadcasting and television. Among them, the frame synchronization of the physical...

AI Technical Summary

Problems solved by technology

[0004] Frame synchronization in the DVB-S2 system faces two main difficulties: one is to work under the condition of extremely low signal-to-noise ratio (as low as -2.35dB), and the other is to resist the large Carrier frequency deviation (up to 20% of data transmission symbol rate)

Traditional methods such as only using frame header symbol correlation operations and methods based on threshold detection to capture frame header positions or other frame synchronization methods that focus on large carrier frequency offset conditions have the disadvantage that threshold parameters need to be selected through a large number of simulations. And it is very sensitive to channel parameters such as signal-to-noise ratio and frequency offset. It is only suitable for high signal-to-noise ratio and relatively stable channel conditions, or the calculation is complicated and the speed of capturing frame headers is too slow; these characteristics obviously cannot meet the requirements of DVB The system requirements of -S2 show the necessity of seeking a high-performance DVB-S2 physical layer frame synchronization

Images