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Method for FSK signal demodulation and its low-power consumption digital circuit

A signal and circuit technology, applied in the direction of phase modulation carrier system, etc., can solve the problems of increasing integration, reducing power consumption, disadvantages, etc., and achieve the effect of reducing power consumption, optimizing power consumption, and low power consumption

Inactive Publication Date: 2008-12-03
BEIJING JIAOTONG UNIV
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Problems solved by technology

This is obviously not conducive to reducing power consumption and improving integration

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  • Method for FSK signal demodulation and its low-power consumption digital circuit
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  • Method for FSK signal demodulation and its low-power consumption digital circuit

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Embodiment Construction

[0022] A method for demodulating FSK signals proposed by the present invention first assumes that there is a sliding window with a fixed size, which slides on the intermediate frequency waves representing "0" and "1" information, such as figure 1 with 2 shown. Take the number of pulses contained in the sliding window as the output, and obtain a waveform composed of three straight lines, rising, falling and horizontal, such as image 3 shown. Judging this waveform, when the sliding window outputs a falling waveform, the transmission frequency f 0 , representing the digital bit "0". When the sliding window outputs a rising waveform, the transmission frequency f 1 , representing the digital bit "1". If the sliding window outputs a waveform level, it means that the output is the same as the previous result, thus demodulating the binary digital bit information.

[0023] Figure 4 It shows that due to the drift of the local oscillator frequency (LO), the mixed intermediate fr...

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Abstract

The invention relates to a method for demodulating FSK signals and a digital circuit with low power consumption thereof, belonging to the technical field of wireless communication. The method provided by the invention comprises the following steps: first, a slide window with fixed dimension is assumed, the slide window slides on an intermediate frequency wave representing '0' and '1' information, the impulse amount contained in the slide window is taken as the output to obtain a waveform consisting of rising line, droop line and horizontal line, the binary digit bit information can be demodulated by judging the waveform, and the method can automatically restrain the influence of frequency drift. The realization circuit of the FSK signal demodulation method provided by the invention consists of a slide window circuit and a bit judgment realization circuit. The whole system is realized by a digital circuit with simple structure, which can further optimize the power consumption and the area of the whole system with a comprehensive tool in digital logic design.

Description

technical field [0001] The invention relates to a method for demodulating a Frequency Shift Keying (FSK) signal and a low-power digital circuit thereof, belonging to the technical field of wireless communication. Background technique [0002] With the development of radio frequency complementary metal oxide (RF CMOS) design technology, many system-on-chip (SOC for short) chips integrate radio frequency transceiver modules. In recent years, wireless communication products with short distance, low power consumption and low cost have been more and more widely used. Among them, reducing power consumption has become the key and difficult point in wireless transceiver design. Since the wireless transceiver adopting the FSK standard can not only use a high-efficiency nonlinear power amplifier, but also does not need to design a complex analog-to-digital converter in the receiver, these characteristics make the FSK transceiver have great power consumption and area. The advantages....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/22H04L27/18
Inventor 彭琼李金城
Owner BEIJING JIAOTONG UNIV
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