Frame Synchronization Method Overcoming Low SNR and Carrier Frequency Offset of Receiver

A technology of carrier frequency offset and low signal-to-noise ratio, which is applied in the field of frame synchronization to overcome the low signal-to-noise ratio and carrier frequency offset of DVB-S2 receivers. It takes a long time and other issues to achieve the effect of low false detection probability, reduce statistical variance, and improve performance

Active Publication Date: 2021-09-03
10TH RES INST OF CETC
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Problems solved by technology

In the DVB-S2 receiving system, the main difficulty of frame synchronization is that it needs to be able to work at an extremely low signal-to-noise ratio and be able to resist the large carrier frequency deviation of the signal. The frame-to-frame synchronization method and the comprehensive comparison and analysis step take too long. And it is not sensitive to carrier frequency offset and phase offset, so it is not easy to choose

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  • Frame Synchronization Method Overcoming Low SNR and Carrier Frequency Offset of Receiver
  • Frame Synchronization Method Overcoming Low SNR and Carrier Frequency Offset of Receiver
  • Frame Synchronization Method Overcoming Low SNR and Carrier Frequency Offset of Receiver

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Embodiment Construction

[0022] refer to figure 1. According to the present invention, the DVB-S2 receiver frame synchronization is divided into a frame header capturing stage and a frame header tracking stage, and in the frame header capturing and tracking stages joint multi-frame frame header data are combined for joint frame header judgment; in the frame header capturing stage, The DVB-S2 receiver uses the SOF+PLSC algorithm to obtain the relevant judgment value. When the relevant judgment value is greater than the preset judgment threshold, the DVB-S2 receiver caches the frame header information and obtains the frame length of the current frame through the RM decoding algorithm. Set the frame count to 0, set the synchronization state to state S0, set the frame header validity and synchronization state count to 1, and then add 1 to the frame count every time a symbol information is received; when the frame count of a certain frame header information When it is equal to the frame length, update th...

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Abstract

The present invention proposes a frame synchronization method for overcoming the low signal-to-noise ratio and carrier frequency offset of a receiver, and aims to provide a frame synchronization method that can work under an extremely low signal-to-noise ratio and is suitable for the DVB-S2 protocol. The present invention is realized through the following technical solutions: the DVB-S2 receiver frame synchronization is divided into a frame header capturing stage and a frame header tracking stage, and in the frame header capturing and tracking stages joint multi-frame frame header data are combined for joint frame header judgment; The DVB‑S2 receiver adopts the SOF+PLSC algorithm to obtain the relevant judgment value, averages the relevant judgment values ​​cached before the frame header, and compares the averaged result with the preset judgment threshold. When it is greater than the judgment threshold, it will synchronize Add 1 to the state count, otherwise set the validity to 0 to mark the frame header as an invalid frame header; for all valid frame header information in the buffer area, operate in parallel to quickly capture the correct frame header.

Description

technical field [0001] The invention relates to a frame synchronization method for overcoming low signal-to-noise ratio and carrier frequency deviation of a receiver in the field of satellite communication, in particular to a frame synchronization method for overcoming low signal-to-noise ratio and carrier frequency deviation of a DVB-S2 receiver. Background technique [0002] DVB-S2 (the 2 nd Generation Digital Video Broadcasting-Satellite) is a second-generation digital satellite broadcasting standard based on DVB-S, which is one of the most advanced satellite broadcasting standards at present. DVB-S2 adopts LDPC code close to Shannon's limit, so that it can work at extremely low signal-to-noise ratio (Es / N0=-2.35dB). In the DVB-S2 standard, data is transmitted in units of frames. At the receiving end, it is necessary to accurately find the starting position of each frame, that is, to find the position of the frame header through frame synchronization, and then extract t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04N5/04H04N7/20
CPCH04L7/0079H04N5/04H04N7/20
Inventor 潘云强刘保国汤达胡新士
Owner 10TH RES INST OF CETC
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