Continuous-phase frequency-shift keying digital demodulation device and demodulation method implemented by same

A technology of phase frequency shift keying and digital demodulation, applied to multi-carrier systems, etc., can solve the problems of high resource consumption, zero-crossing detection method can not adapt to the data rate close to the carrier frequency, and complex implementation of coherent demodulation method, etc. Achieve strong signal adaptability, avoid complex and easy-to-achieve effects

Inactive Publication Date: 2014-03-12
TOEC TECH
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Problems solved by technology

Among them, the coherent demodulation method is complicated to implement, the frequency discrimination method and the matched filter method consu

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  • Continuous-phase frequency-shift keying digital demodulation device and demodulation method implemented by same

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing, the present invention will be further described: as figure 1 As shown, the clock unit determines the system operating clock frequency value according to the continuous phase frequency shift keying signal carrier frequency and modulation degree, and generates the system operating clock by frequency division of the external clock frequency source, which is provided to the sampling unit, counting unit, buffer unit and reconstruction unit , if the ratio of the external clock source frequency to the operating clock frequency is n, the maximum frequency division count value is (n / 2)-1, the initial state of the clock unit is the working clock signal is low, the frequency division count value is 0, and the clock unit The frequency division count value is judged at the rising edge of each external clock source. If it is less than the maximum frequency division count value, the frequency division count value is increased by 1, ot...

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Abstract

The invention relates to a digital demodulation device, in particular to a continuous-phase frequency-shift keying digital demodulation device and a demodulation method implemented by the same. The continuous-phase frequency-shift keying digital demodulation device comprises a comparator device and a field-programmable gate array device. An internal circuit of the field-programmable gate array device comprises a clock unit, a sampling unit, a counting unit, a buffer unit and a reconstruction unit, and the clock unit is connected with the sampling unit, the counting unit, the buffer unit and the reconstruction unit; the comparator device is connected with the sampling unit; the sampling unit is connected with the counting unit; the counting unit is connected with the buffer unit; the buffer unit is connected with the reconstruction unit. The continuous-phase frequency-shift keying digital demodulation device and the demodulation method have the advantages that the demodulation device has the simple circuit and is easy to implement, low in programmable logic resource consumption and high in signal adaptability; the demodulation method can replace the traditional continuous-phase frequency-shift keying digital demodulation method, so that shortcomings of complexity in implementation, high resource consumption and inadaptability to proximity of data rates and carrier frequencies can be overcome, and the like.

Description

technical field [0001] The invention relates to a digital demodulation device, in particular to a continuous phase frequency shift keying digital demodulation device and a demodulation method thereof. Background technique [0002] Traditional continuous phase frequency shift keying digital demodulation methods generally include coherent demodulation method, frequency discrimination method, zero-crossing detection method, matched filter method and so on. Among them, the coherent demodulation method is complicated to implement, the frequency discrimination method and the matched filter method consume a lot of resources, and the zero-crossing detection method cannot adapt to the situation where the data rate is close to the carrier frequency. Contents of the invention [0003] In view of the deficiencies in the prior art, the present invention provides a continuous phase frequency shift keying digital demodulation device and a demodulation method thereof....

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Application Information

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IPC IPC(8): H04L27/38
Inventor 张鹏泉张波马彪李柬范玉进曹晓冬褚孝鹏李羚梅李光
Owner TOEC TECH
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