Burst frame detection and timing synchronization method and system based on Wi-SUN system

A timing synchronization, burst frame technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as limited performance improvement, expansion of computing time and storage space for computing, and impact on data collection of long preamble parts. , to achieve accurate timing, improve detection performance, and improve accuracy.

Active Publication Date: 2019-07-02
北京中宸微电子有限公司
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Problems solved by technology

[0007] 4. High-order cumulant signal detection method: This method uses a multi-point sliding correlation method, and its effect performance is better than that of method 2, but the performance improvement is limited
The test shows that when the signal-to-noise ratio is less than -3dB, using the local sequence direct cross-correlation method, the main peak position judgment can no longer meet the accuracy rate > 99%
[0012] If you want to improve the accuracy of detection, you must increase the length of the relevant data, expand the calculation time and storage space for calculation, and if you completely use the last symbol as the relevant data, and adjust the timing after measuring the timing deviation, it will affect the length of the long preamble. data collection

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  • Burst frame detection and timing synchronization method and system based on Wi-SUN system
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  • Burst frame detection and timing synchronization method and system based on Wi-SUN system

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[0083] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0084] The channel used by Wi-Sun system for burst frame detection, timing synchronization, and frequency offset correction is the preamble sequence, which is divided into short preamble (STF) and long preamble (LTF) sequences. Inverted structure, the long preamble part is a standard OFDM signal. Therefore, in most cases, the short preamble is used for burst frame detection and preliminary timing correction, and the long...

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Abstract

The invention relates to a burst frame detection and timing synchronization method and system based on a Wi-SUN system. According to the burst frame detection and timing synchronization method and system, in cross-correlation burst frame detection, peak merging and peak-to-average ratio calculation are added, and the signal-to-noise ratio threshold of burst frame detection is reduced. According tothe invention, the repetition and inversion characteristics of the short predecessor are utilized; a specific local correlation sequence is constructed; a conventional multi-peak maximum evaluation timing correction method is converted into single-peak timing estimation, so that the system avoids the problem of main and auxiliary peak position exchange caused by multi-peak noise interference in alow signal-to-noise ratio environment, the timing calibration reliability is improved, and wider working conditions are provided for accurate timing and frequency offset adjustment of a subsequent long-lead sequence.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and system for burst frame detection and timing synchronization based on Wi-SUN system. Background technique [0002] At present, the Wi-Sun communication protocol adopts the IEEE802.15.4g protocol standard OFDM system. The signal used for burst frame detection and synchronization calibration is divided into short preamble (STF) and long preamble (LTF). Most systems use short preamble. For burst frame detection and initial synchronization adjustment, the long preamble is used for frequency offset correction and precise timing. With the expansion of the protocol system, more and more low signal-to-noise ratio working environments appear. How to reduce the demodulation threshold of the system without modifying the synchronization signal protocol has become a development direction of research and implementation. [0003] The conventional burst frame detection adopts t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2665
Inventor 李桂林童炜彭琛越
Owner 北京中宸微电子有限公司
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