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Frame synchronization method for overcoming low signal-to-noise ratio and carrier frequency offset of receiver

A technology of carrier frequency deviation 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 deviation of DVB-S2 receivers, and can solve the problems of difficult selection, long time required, carrier frequency deviation and phase deviation Insensitivity to road sensitivity and other issues, to achieve the effect of low false detection probability, improve performance, and reduce statistical variance

Active Publication Date: 2019-07-19
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 for overcoming low signal-to-noise ratio and carrier frequency offset of receiver
  • Frame synchronization method for overcoming low signal-to-noise ratio and carrier frequency offset of receiver
  • Frame synchronization method for overcoming low signal-to-noise ratio 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 invention provides a frame synchronization method for overcoming low signal-to-noise ratio and carrier frequency offset of a receiver, and aims to provide a frame synchronization method which canwork at an extremely low signal-to-noise ratio and is suitable for DVB-S2 protocol. The method is realized through the following technical scheme: DVB-S2 receiver frame synchronization is divided intoa frame header capturing stage and a frame header tracking stage, and multi-frame frame header segment data is combined in the frame header capturing and tracking stage to carry out combined frame header judgment; the DVB-S2 receiver adopts an SOF+PLSC algorithm to obtain related decision values, the related decision values are averaged with a plurality of related decision values cached before the frame header, an average result is compared with a preset decision threshold, if the average result is greater than the decision threshold, one is added to the synchronous state count, otherwise, the effectiveness is set to be 0, and the frame header is marked as an invalid frame header; and for all valid frame header information of the cache region, parallel operation is carried out to quicklycapture correct frame headers.

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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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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