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A demodulation method of mfsk signal

A signal demodulation and signal technology, applied in the field of signal demodulation

Active Publication Date: 2018-09-14
YANGO UNIV
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Problems solved by technology

[0004] The present invention aims to solve the problem of accurate signal demodulation under the condition of Doppler frequency shift

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  • A demodulation method of mfsk signal
  • A demodulation method of mfsk signal
  • A demodulation method of mfsk signal

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Embodiment Construction

[0035] The following will refer to Figure 1-8 Specific embodiments of the present invention will be described.

[0036] A kind of MFSK signal demodulation method, such as figure 1 As shown, the method includes:

[0037] Step 1, oversampling the received MFSK signal s(t) to obtain a discrete received signal s(n), where t is continuous time, n is a discrete time sequence number, n=1,2,...,N, for all The discrete received signal s(n) is short-time Ramanujan Fourier transform ST-RFT to obtain Ramanukin Fourier spectrum S(m,q), time m=1,2,...,N, Frequency q=1,2,...,N, set the Ramanujan Fourier spectrum E of the Ramanujan Fourier spectrum S(m,q) m (q)=|S(m,q)| 2 ;

[0038] Further, the MFSK signal expression in step 1 is

[0039]

[0040] Among them, T b is the symbol period, g(t) is from 0 to T b A gate function with a magnitude of 1 between them,

[0041] M carrier frequencies Set the sampling frequency f s , then the sampling period T s =1 / f s , the discrete MFS...

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Abstract

The present invention discloses a method for demodulating an MFSK signal. The method includes: oversampling a received MFSK signal; performing the short-time Ramanujan Fourier transform to obtain a Ramanujan Fourier spectrum; calculating a modulus of the Ramanujan Fourier spectrum and squaring the modulus to obtain a Ramanujan Fourier spectrogram; performing time-sampling on the Ramanujan Fourier spectrogram to obtain a Ramanujan Fourier spectrogram of code element centers; performing a spectrum peak search on the Ramanujan Fourier spectrogram of the code element centers to obtain a spectrum peak position frequency function; and applying a temporal point-by-point spectrum peak selection algorithm to the spectrum peak position frequency function to obtain demodulated data information. The method in the present invention solves the problem of accurately demodulating the MFSK signal in the presence of a Doppler frequency shift.

Description

technical field [0001] The invention relates to a signal demodulation method, in particular to a MFSK signal demodulation method. Background technique [0002] Signal demodulation is an important link in various communication systems. The sending end modulates the message to be transmitted to generate a signal carrying the message. The receiving end must demodulate to restore the transmitted message. The quality of the demodulation method plays a very important role in the overall performance of the communication system. In the process of signal transmission, due to the influence of additive white Gaussian noise (AWGN), Doppler frequency shift, etc., how to accurately restore the modulation information in the received signal containing noise is an urgent problem to be solved. [0003] Traditional MFSK signal demodulation methods include: envelope detection, coherent demodulation and short-time Fourier transform ST-DFT-based demodulation methods. Among them, envelope detect...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/14
CPCH04L27/14
Inventor 马秀荣单云龙刘丹梁裕卿
Owner YANGO UNIV