A low-complexity GMSK demodulation timing synchronization method in burst communication

Abstract

The invention discloses a GMSK demodulation timing synchronization method with low complexity in burst communication. In a short-time burst communication system, timing synchronization is generally completed by only one section of synchronization sequence, so that the reliability of subsequent data is reduced. The method comprises the following steps: 1, receiving and splitting a processed sequence, and carrying out matched filtering; 2, constructing a local synchronization sequence and a position index sequence, and calculating average power and related peak values; And 4, setting a thresholdvalue, and judging whether the processed sequence is effective or not; 5, intercepting partial sequences; and 6, calculating the phase, and rotating according to the phase. The method has the advantages of being simple in implementation framework, low in complexity and the like, and the demodulation performance of the method is superior to that of a traditional incoherent demodulation mode and close to that of coherent demodulation performance. According to the method, the accumulated error generated by timing synchronization can be effectively eliminated, so that the robustness of the burstcommunication system is 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 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 modulation method has the advan...

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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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