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A cpfsk modulation recognition method based on moving average of instantaneous frequency of signal

A technology of CPFSK and instantaneous frequency, which is applied in the field of continuous phase frequency shift keying modulation recognition based on the moving average of signal instantaneous frequency, can solve the problem of small signal-to-noise ratio range, achieve small amount of calculation, low computational complexity, and simple process Effect

Inactive Publication Date: 2019-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

For the modulation identification of CPFSK signal, due to changing its amplitude sequence {I n } base M, changing the modulation index h will have a greater impact on the spectrum of the signal, so the identification method using the characteristics of the signal spectrum is no longer applicable
The traditional methods based on instantaneous phase, frequency, etc., due to the influence of noise, the applicable signal-to-noise ratio range is small

Method used

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  • A cpfsk modulation recognition method based on moving average of instantaneous frequency of signal
  • A cpfsk modulation recognition method based on moving average of instantaneous frequency of signal

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] figure 1 It is a specific implementation flow chart of the CPFSK modulation recognition method based on signal linear fitting instantaneous phase of the present invention. Assuming that the received signal modulation mode is 2CPFSK, 4CPFSK or 8CPFSK, the parameters are set as follows: SNR E s / N 0 From 8dB to 28dB, the step size is 2dB, the sampling rate f s =4MHz, code rate R B =200ksps, modulation coefficient h=1, 1000 symbols are sampled for a signal containing noise, and 100 Monte Carlo experiments are performed at each signal-to-noise ratio. In this invention with E s / N 0 Indicates the signal-to-noise ratio, in dB, E s Indicates the energy of each symbol of the signal, N 0 is the power spectral density.

[0028] Step 1. Sampling the received signal to obtain r(n), n=1, 2, . . . , 20000.

[0029] Step 2. Use the Kaiser window to design a...

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Abstract

The invention belongs to the technical field of modulation identification in intelligent communication, and in particular relates to a continuous phase frequency shift keying (Continuous Phase Frequency Shift Keying, CPFSK) modulation identification method based on a sliding average of instantaneous frequency of a signal. The method of the invention utilizes the differences in instantaneous frequency distribution of CPFSK signals of different bases, models the CPFSK signal and extracts the instantaneous phase of the signal, derivates the instantaneous phase and then combines the sliding average method to obtain a more accurate instantaneous frequency of the signal.

Description

technical field [0001] The invention belongs to the technical field of modulation identification in intelligent communication, and in particular relates to a continuous phase frequency shift keying (Continuous Phase Frequency Shift Keying, CPFSK) modulation identification method based on a sliding average of instantaneous frequency of a signal. Background technique [0002] The conventional Frequency Shift Keying (FSK) signal is generated by carrier frequency shift, which is generated by using the burst switching of the output of one oscillator to another, thus causing the signal to be discontinuous in phase and in There are relatively large spectral side lobes outside the main frequency band of the signal. In order to avoid using signals with large spectrum side lobes, a continuous phase FSK signal is often used in wireless communication, called CPFSK signal. [0003] The transmitted signal of CPFSK modulation is expressed as in, is the amplitude, f c is the carrier f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04B10/556
CPCH04B10/5561H04L27/0012
Inventor 杜继萍尹久廖红舒甘露
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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