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Low-complexity GMSK demodulation timing synchronization method for burst communication

A low-complexity, timing synchronization technology, applied in synchronization devices, FM carrier systems, digital transmission systems, etc., can solve the problems of reducing data reliability, weak anti-noise ability, and threshold effect, eliminating accumulated errors, improving Robustness, achieving the effect of simple architecture

Inactive Publication Date: 2019-04-26
HANGZHOU DIANZI UNIV
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Problems solved by technology

Limiting frequency discrimination demodulation has weak anti-noise ability and has threshold effect; although differential demodulation is simple to implement, its anti-interference ability of demodulation and coherent demodulation also has a large gap
[0004] Timing synchronization is an important processing link for burst communication reception. For continuously transmitted signals, the timing synchronization method is to determine the timing synchronization position according to the synchronization sequence inserted in the information sequence. In short-term burst communication systems, only a synchronization sequence is usually used. To complete timing synchronization, reducing the reliability of subsequent data

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  • Low-complexity GMSK demodulation timing synchronization method for burst communication
  • Low-complexity GMSK demodulation timing synchronization method for burst communication
  • Low-complexity GMSK demodulation timing synchronization method for burst communication

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with accompanying drawing.

[0037] Such as figure 1 Shown, the concrete steps of the low-complexity GMSK demodulation timing synchronization method in a kind of burst communication are as follows:

[0038] Step 1. The receiver's antenna receives a section of length (L bark +1)L x +L bark L PN The sequence S (sequence S is the sequence received by the receiver, that is, the sequence of data frames finally transmitted by the transmitter). Such as figure 1 As shown, the sequence S is inserted into the initial information sequence according to the polarity of the Barker code and L is equally spaced bark PN a Obtained, a=0,1 (that is, the sequence S is alternately arranged in sequence L bark +1 sub-information sequence with L bark PN a composition); synchronization sequence PN a The length is L PN ; The length of the sub-information sequence is L x . Synchronous sequence PN 0 , synchronizati...

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Abstract

The invention discloses a low-complexity GMSK demodulation timing synchronization method for burst communication. In a short-time burst communication system, timing synchronization is usually completed by only one section of synchronization sequence, so that the reliability of subsequent data is reduced. The method comprises the steps of 1, receiving and splitting a processed sequence, and carrying out matched filtering; 2, constructing a local synchronization sequence and a position index sequence, and establishing an average power sequence; 4, setting a threshold value epsilon, and judging whether the processed sequence is valid or no; 5, capturing part of the sequence; and 6, calculating a phase, and carrying out rotation according to the phase. The method can recover a coherent carrierby using a large amount of data without a loop, and has the characteristics of being simple in architecture implementation, low in complexity and the like. The timing synchronization is achieved by inserting a multi-terminal synchronization sequence, and accumulated errors caused by the timing synchronization can be effectively eliminated, so that the robustness of the burst communication systemis improved.

Description

technical field [0001] The invention belongs to the technical field of burst communication, and in particular relates to a low-complexity GMSK demodulation timing synchronization method in burst communication. Background technique [0002] Burst communication is an information transmission technology that compresses and processes the information that needs to be transmitted, and then 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 the burst communication system, GMSK (Gaussian Minimum Shift Keying, Gaussian Minimum Shift Keying) modulation technology has been widely used. This modulation method has t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/10H04L27/14H04L7/00
CPCH04L7/00H04L27/10H04L27/14
Inventor 易志强彭冬雨张福洪卓怡琳陈豪俊江静
Owner HANGZHOU DIANZI UNIV
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