Method and device for demodulating signals

A technology for demodulating signals and signals, applied in the field of demodulating signals, can solve the problems of poor anti-interference and high hardware requirements

Active Publication Date: 2017-11-28
RUIJIE NETWORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The embodiment of the present application provides a method and device for demodulating signals to solve the problems existing in the prior art, such as high hardware requirements or poor anti-interference performance

Method used

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  • Method and device for demodulating signals
  • Method and device for demodulating signals

Examples

Experimental program
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Embodiment 1

[0119] refer to figure 2 , which is a flow chart of a method for demodulating a signal provided in Embodiment 1 of the present application, the method is applied to FSK and / or GFSK signal demodulation, and the method includes the following steps:

[0120] Step 201: During the process of receiving signals in real time, the received signals are sequentially down-converted, analog-to-digital sampled, and low-pass filtered in real time to obtain a zero-IF digital signal.

[0121] Step 202: Perform discrete short-time Fourier transform (DSTFT) on the zero-IF digital signal to obtain a transformed digital signal.

[0122] Wherein, for each sampling point (that is, each zero-IF digital signal), the DSTFT transformation result can be represented by the following formula (1):

[0123]

[0124] Among them, m is the summation variable, and the formula indicates that a calculation is performed for each sampling point, and then the calculation results are accumulated. x(m) represents...

Embodiment 2

[0215] Based on the same inventive concept, an embodiment of the present application further provides an apparatus for demodulating a signal, which is applied to a frequency shift keying signal FSK and / or a Gaussian frequency shift keying signal GFSK. The principle and beneficial effects of the device are the same as those of the method described in Embodiment 1, and will not be repeated here.

[0216] see Figure 7 , is a schematic diagram of the structure of the device, including

[0217] The pre-processing module 701 is used to obtain a zero-IF digital signal after sequentially performing down-conversion, analog-to-digital sampling, and low-pass filtering processing on the received signal in real time during the process of receiving the signal in real time;

[0218] The DSTFT transform module 702 is configured to perform discrete short-time Fourier DSTFT transform on the zero-IF digital signal to obtain a transformed digital signal;

[0219] The energy calculation module ...

Embodiment 3

[0258] Embodiment 3 of the present application also provides a computing device, which may specifically be a desktop computer, a portable computer, a smart phone, a tablet computer, a personal digital assistant (Personal Digital Assistant, PDA), a server, a base station, and the like. like Figure 8 As shown, the computing device may include a central processing unit (Center Processing Unit, CPU) 801, a memory 802, an input device 803, an output device 804, etc., the input device may include a keyboard, mouse, touch screen, etc., and the output device may include a display device, Such as liquid crystal display (Liquid Crystal Display, LCD), cathode ray tube (Cathode Ray Tube, CRT) and so on.

[0259] The memory may include read only memory (ROM) and random access memory (RAM), and provides the processor with program instructions and data stored in the memory. In the embodiment of the present application, the memory may be used to store program instructions of the method for ...

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Abstract

The invention relates to the technical field of wireless communication, in particular to the problem of how to demodulate FSK and / or GFSK signals. The invention provides a method and a device for demodulating signals. According to the embodiment of the invention, frequency offset is performed in a frequency domain, and frequency offset compensation is performed on signals subjected to DSTFT transformation, i.e., achieving frequency offset compensation in the frequency domain. Thus, compared with the time frequency-based non-coherent demodulation where frequency offset compensation is performed in time domain, the frequency offset compensation performed in the frequency domain has anti-interference ability. There is no need to recover carrier waves which have the same frequency and phase with carrier waves of a signal sending end locally, so the demodulation method is simple and requirements on hardware are not high.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a method and device for demodulating signals. Background technique [0002] FSK (Frequency-shift keying, frequency shift keying), GFSK (Gauss frequency Shift Keying, Gaussian frequency shift keying) are common modulation methods in digital communication. Because of its short demodulation delay, easy implementation, and strong anti-interference and fading capabilities, it is widely used in the field of medium and low-speed data communications. [0003] In recent years, with the wide application of low-speed and low-power wide-area networks in hydropower metering, smart home, municipal management, smart irrigation, etc., FSK / GFSK modulation has gained widespread attention. [0004] Traditional FSK / GFSK demodulation methods mainly include coherent demodulation and time-domain non-coherent demodulation methods, among which: [0005] The coherent demodul...

Claims

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Application Information

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IPC IPC(8): H04L27/156H04L27/16H04L27/00
CPCH04L27/0014H04L27/1566H04L27/16H04L2027/0026
Inventor 温泉泉
Owner RUIJIE NETWORKS CO LTD
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