Cross-correlation and autocorrelation cascade based frame synchronizing method

An auto-correlation and cross-correlation technology, used in digital transmission systems, error prevention, electrical components, etc., can solve problems such as inaccuracy and large interference, and achieve the effect of solving correlation peak drop, reliable frame synchronization, and reducing the probability of missed alarms

Active Publication Date: 2012-08-15
PEKING UNIV +1
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Problems solved by technology

This method can overcome the influence of carrier frequency offset on the correlation results and combine multipath energy, but the correlation results are often flat, and the detection is greatly interfered by Gaussian noise, which is not accurate enough

Method used

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  • Cross-correlation and autocorrelation cascade based frame synchronizing method
  • Cross-correlation and autocorrelation cascade based frame synchronizing method
  • Cross-correlation and autocorrelation cascade based frame synchronizing method

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0030] figure 1 It is an implementation device of the frame synchronization method proposed by the present invention, including 5 modules in total, namely: 1-cross-correlation module, 2-local sequence module, 3-autocorrelation module, 4-delay module, 5-threshold Judgment module. The delay module is used for a correlation output sequence C 1 (n) Delay, the output C of the autocorrelation module 2 (n) lagging behind the output C of the cross-correlation module 1 (n), so for C 1 (n) and C 2 (n) To make a joint judgment, it is necessary for C 1 (n) Delay. Threshold decision module for C 1 (n) and C 2 (n) Make a joint decision to detect the frame start time.

[0031] image 3 C under the same simulation conditions as above 2 The oscillogram of (n), wherein chooses W=8, through merging and dispersing a plurality of peaks, C 2 The peak val...

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Abstract

The invention relates to a cross-correlation and autocorrelation cascade based frame synchronizing method, which includes: 1) repeatedly modulating a synchronizing sequence in length of N twice at a transmitting end to serve as a frame header of a physical layer frame, transmitting radio signals to a receiving end through a signal generator, sampling the radio signals to be a discrete sequence after the receiving end receives the radio signals; 2) subjecting the received discrete sequence to sliding cross-correlation operation through the local-storage synchronization sequence at the receiving end and obtaining a first secondary correlation output sequence; 3) subjecting the first secondary correlation sequence in the step 2) at the receiving end to obtain a second secondary correlation output sequence; and 4) finishing frame synchronization since any moment is the starting moment of the physical layer frame if sampling point value of the first secondary correlation output sequence at any moment is larger than a set threshold value output by first secondary correlation and a sampling point value in the second secondary correlation output sequence is larger than a set threshold value output by second secondary correlation.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and in particular relates to a frame synchronization technology using cross-correlation and auto-correlation cascading. This technology can still accurately estimate the starting position of a frame when there is multipath influence in the received signal . Background technique [0002] In a burst communication system, frame synchronization is a key technology in the design of the receiver. Since the receiving end cannot accurately know the starting position of the physical layer frame, it is necessary to use the frame synchronization module to estimate the starting time of the physical layer frame according to the specific information in the received signal. A good frame synchronization algorithm can resist the influence of noise, carrier frequency offset, multipath and other interference factors, achieve a lower false alarm probability and missing alarm probability, and achieve a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 宋诗琴吴毅凌赵辉李斗赵玉萍李红滨
Owner PEKING UNIV
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