A Modulation Recognition and Parameter Estimation Method of Wireless Communication Signal Based on Cyclic Spectrum
A technology of wireless communication and identification method, which is applied in the field of communication technology and digital signal processing, can solve the problems of large influence of signal-to-noise ratio and poor performance, and achieve the effect of effective estimation
Active Publication Date: 2019-10-11
SOUTHEAST UNIV
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The use of nonlinear transformation methods makes this type of carrier frequency estimation greatly affected by the signal-to-noise ratio, and the performance is poor in low-signal-to-noise ratio environments
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[0028] The technical solution of the present invention will be further explained below in conjunction with the accompanying drawings.
[0029] Such as figure 1 The overall structure diagram of modulation identification and parameter estimation based on cyclic spectrum is shown. First, the bandwidth of the analog signal is roughly estimated, and the estimated bandwidth value and center frequency are used to simulate the down-conversion of the signal to the intermediate frequency band. After bandpass filtering and After the digital-to-analog conversion, the cyclic spectrum of the digital intermediate frequency signal is calculated, and the calculated result is used for modulation identification and parameter estimation.
[0030] Correspondingly, figure 2 The wireless communication signal modulation identification and parameter estimation method based on cyclic spectrum in the medium includes the following steps:
[0031] 1) Rough estimation of signal bandwidth: After receivin...
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The present invention discloses a cyclic spectrum-based wireless communication signal modulation identification method. According to the method, first, a signal bandwidth is roughly estimated, and band-pass filter is performed; then a signal cyclic spectrum density is calculated by using a spectrum related method, a spectrum peak of a specific section of the cyclic spectrum is searched according to the cyclic spectrum density so as to acquire a related spectrum peak, and a feature parameter is calculated according to the related spectrum peak; and finally, a modulation manner signal is identified according to the feature parameter. A communication signal modulation manner is identified accurately in a case in which no prior information is available. The present invention further discloses a modulation identification and parameter estimation method based on the modulation identification. Carrier frequency estimation and symbol rate estimation are performed on different modulation manner signals by using an original cyclic spectrum, a quadratic spectrum and a square spectrum of the signal according to a modulation identification result.
Description
technical field [0001] The invention belongs to the field of communication technology and digital signal processing, in particular to a cyclic spectrum-based wireless communication signal modulation identification method and a cyclic spectrum-based wireless communication signal modulation identification and parameter estimation method. Background technique [0002] Commonly used wireless communication signals include 2ASK (2Amplitude Shift Keying binary amplitude keying), 2FSK (2Frequency Shift Keying binary frequency shift keying), BPSK (Binary Phase Shift Keying binary phase shift keying), QPSK (Quadrature Phase Shift Keying quadrature Phase Shift Keying), MSK (MinimumShift Keying Minimum Frequency Shift Keying), 16QAM (16Quadrature Amplitude Modulation16 Quadrature Amplitude Modulation) signals. In many non-cooperative communications, such as point-to-multipoint network communications, radio monitoring and management, communication system fault detection, cognitive radio ...
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IPC IPC(8): H04L27/00
Inventor 张萌陈子洋吴建辉时龙兴
Owner SOUTHEAST UNIV