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A gmsk demodulation synchronization method against frequency offset in burst communication

A technology of burst communication and synchronization sequence, which is applied in the direction of carrier adjustment, modulated carrier system, digital transmission system, etc. It can solve the problems of increased error probability of demodulated data, large phase error difference, and unsatisfactory problems, so as to improve synchronization performance, Effects of improving reliability and eliminating the cumulative effect of phase errors

Active Publication Date: 2021-11-23
明澜(南京)电子有限公司
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  • Application Information

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Problems solved by technology

However, in the case of a large frequency offset, the phase error caused by the frequency offset of the demodulated data at each moment is quite different, and the phase information of a single correlation peak cannot effectively reflect the phase error of the data, which leads to an increase in the error probability of the demodulated data, especially in Even less ideal with longer dataframes

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  • A gmsk demodulation synchronization method against frequency offset in burst communication
  • A gmsk demodulation synchronization method against frequency offset in burst communication
  • A gmsk demodulation synchronization method against frequency offset in burst communication

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Embodiment Construction

[0047] Below in conjunction with accompanying drawing, the present invention will be further described, and concrete steps are as follows:

[0048] Step 1. The data frame of this communication system is composed of the original information sequence according to the length L b Each bit value of the Barker code is equally spaced into L b Pseudo-random synchronization sequence PN a Obtained, the values ​​of a are 0 and 1, which correspond to 0 and 1 of the Barker codeword. Synchronization sequence PN a The length is L P , the length of the first information sequence and two adjacent synchronization sequences PN a The length of the information sequence between them is L x . Set the zero-IF sequence received by the receiving end after AD sampling as R during communication, and set the initial value of the flag bit Flag to 0.

[0049] Matched filtering. Calculate the filter output sequence R' as shown in formula (1).

[0050] R'=R*ρ Equation (1)

[0051] In formula (1), "*...

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Abstract

The invention discloses a GMSK demodulation synchronization method for anti-frequency offset in burst communication. The invention uses non-single correlation peak information, which can effectively reduce the severe interference of the correlation peak at the best position by large frequency offset, and reduce the virtual frequency of correlation peak capture. alarm and missed alarm probability, thereby improving the synchronization performance of the receiver; under the condition of large frequency offset, the present invention uses the phase information of the non-single correlation peak to complete the phase derotation of the corresponding demodulated data, which can eliminate the frequency offset. The cumulative effect of the phase error reduces the error probability of demodulated data, thereby improving the reliability of the burst communication system.

Description

technical field [0001] The invention belongs to the technical field of burst communication, and in particular relates to a GMSK demodulation synchronization method applied in a burst communication system to resist frequency deviation. Background technique [0002] Burst communication is an information transmission technology that compresses and processes the information that needs to be transmitted, and sends the information in a short time at a certain point in time. This technology reduces the probability of information being discovered by reducing the signal transmission time and increasing the uncertainty of signal transmission time, and has the characteristics of good reliability and high transmission efficiency. It has important application value in the field of secure communication technology. [0003] At present, in burst communication systems, GMSK (Gaussian Minimum Shift Keying, Gaussian Minimum Shift Keying) modulation technology has been widely used. This modula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/148H04L27/00
CPCH04L27/0014H04L27/148H04L2027/0024H04L2027/0026
Inventor 易志强彭冬雨张福洪卓怡琳陈豪俊江静
Owner 明澜(南京)电子有限公司