Identification method of low signal-to-noise ratio phase-shift keying modulating signal

A technology of phase-shift keying and signal modulation, which is applied in the direction of modulated carrier system, phase-modulated carrier system, digital transmission system, etc. It can solve the problems of failure, recognition rate decline, etc., to reduce the impact, reduce the adverse impact, and optimize four times Effects of Square Magnitude Spectrum and Envelope Spectrum

Inactive Publication Date: 2010-03-17
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0017] The present invention aims at the problem that the identification rate of the existing phase-shift keying modulation signal identification method decreases or fails under the condition of low signal-to-noise ratio, and proposes a new identification method of phase-shift keying modulation signal with low signal-to-noise ratio. A calculation method based on th

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  • Identification method of low signal-to-noise ratio phase-shift keying modulating signal
  • Identification method of low signal-to-noise ratio phase-shift keying modulating signal
  • Identification method of low signal-to-noise ratio phase-shift keying modulating signal

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Embodiment Construction

[0041] In this embodiment, the most commonly used BPSK, QPSK, and OQPSK signals in actual communication systems are taken as examples to carry out computer simulations for automatic identification of modulation modes, and random sequences are used as the source of digital modulation signals. Modulation signal symbol rate, carrier frequency and sampling frequency were normalized, and selected as 0.05, 0.1, 1 for others. Add additive white Gaussian noise with a mean value of zero, and set the roll-off factor to 0.35. Simulations were performed 100 times for each signal-to-noise ratio. The operating system of the simulation platform is WINXP, which is compiled with MATLAB. Adopt the identification method of the low signal-to-noise ratio phase-shift keying modulation signal that the present invention proposes, wherein: the coefficient a in the step 3 is 0.4, the coefficient b in the step 4 is 0.55, the coefficient ε in the step 4 is 2.2, and the step 5 The coefficient c in is 0....

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Abstract

The invention discloses an identification method of a low signal-to-noise ratio phase-shift keying modulating signal, which belongs to the technical field of communication. The identification method of the low signal-to-noise ratio phase-shift keying modulating signal firstly identifies a BPSK signal through a quadratic spectrum based on dislocation multiplication, then identifies a QPSK or OQPSKsignal through a biquadrate spectrum based on dislocation multiplication, and then calculates an envelope spectrum and implements optimization processing, and finally identifies the QPSK signal and the OQPSK signal through the optimized envelope spectrum. The invention provides a quadratic or biquadrate amplitude spectrum function calculation mode based on dislocation multiplication, which can effectively reduce the interference of noise to signal, thus effectively improving the recognition rate of the phase-shift keying modulating signal under the condition of lower signal-to-noise ratio; inaddition, the optimized biquadrate amplitude spectrum and envelope spectrum are adopted to further reduce the negative influences on spectrum peak searching caused by noise, thereby effectively improving the recognition rate. A simulation result indicates that the identification method of the low signal-to-noise ratio phase-shift keying modulating signal can realize recognition rate of more than 90 percent between QPSK and OQPSK when the signal-to-noise ratio is 0 dB; and the recognition rate between QPSK and BPSK can reach more than 90 percent when the signal-to-noise ratio is -7dB.

Description

Technical field: [0001] The invention belongs to the technical field of communication, and relates to an automatic identification method of a phase-shift keying (PSK) signal modulation mode under the condition of a relatively low signal-to-noise ratio. Background technique: [0002] Today is an era of information technology changing with each passing day. Various communication methods and communication technologies emerge in an endless stream, making our living space full of various electromagnetic waves. In traditional communication stations or systems, once the transmitting and receiving parties are turned on, they work in a fixed modulation mode. Today's communication methods, such as software radio, show the characteristics of multi-system, multi-band, multi-rate, and multi-service, which makes it impossible for the communication receiver to wait and receive on a specific modulation method unless it is agreed in advance. Especially for the software radio station used as...

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Application Information

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IPC IPC(8): H04L27/00H04L27/22
Inventor 廖红舒李立萍周晖
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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