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CPFSK modulation identification method

A CPFSK and 8CPFSK technology, which is applied in modulation type identification, modulation carrier system, digital transmission system, etc., can solve the problem of small signal-to-noise ratio range

Active Publication Date: 2016-04-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

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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Embodiment Construction

[0032] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0033] Such as figure 1 As shown, assume that the received signal modulation mode is 2CPFSK, 4CPFSK or 8CPFSK, and the parameters are set as follows: the signal-to-noise ratio SNR is taken from 3dB to 7dB, the step size is 0.5dB, the symbol rate Rb=150KHz, the sampling rate f s =1.5MHz, modulation coefficient h=0.7, 10,000 points are sampled for the signal containing noise, and 200 Monte Carlo experiments are performed under each signal-to-noise ratio.

[0034] Step 1. Perform Hilbert transform on the sampled received signal r(n), n=1,2,...,10000: From this, the complex signal corresponding to the received signal can be obtained: R ( n ) = r ( n ) + j r ...

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Abstract

The invention belongs to the cognitive radio communication signal modulation identification technical field, especially a continuous phase frequency shift keying (Continuous Phase Frequency Shift Keying, CPFSK) modulation identification method based on signal linear fitting instantaneous phase. According to the CPFSK modulation identification method, the feature of the CPFSK signal is used sufficiently, the feature is that the instantaneous phase of the CPFSK signal in every symbol are linearly increased or reduced; the new feature extracting method is better in noise immunity through modeling the CPFSK signal, extracting the signal instantaneous phase and combing the linear fitting method; a simulation experiment shows that the algorithm is visual in result, good in performance and relatively low in operation complexity.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio and communication signal modulation identification, and in particular relates to a Continuous-Phase Frequency Shift Keying (CPFSK) modulation identification method based on signal linear fitting instantaneous phase. Background technique [0002] CPFSK is different from the non-continuous phase frequency shift keying (FrequencyShiftKeying, FSK) signal, its carrier phase is continuous at the symbol conversion point, so it has a narrower main lobe and lower side lobe in the spectrum, and has a higher Frequency band utilization has been widely used in deep space communication, mobile communication and satellite communication and other fields. [0003] The transmitted signal of CPFSK modulation is expressed as Among them, A is the amplitude (determined value), φ(t) is the continuously changing phase, controlled by the input symbol, expressed as: d(τ) is the continuous wave signal formed by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/0012
Inventor 尹久杜继萍廖红舒甘露
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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