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
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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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