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Sideband modulating signal classifying method and device

A technology of signal classification and sideband modulation, applied in the field of cognitive radio, to achieve low complexity and expand the practical range

Inactive Publication Date: 2013-06-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for classifying sideband modulation signals, which solves the problem that the carrier frequency information must be known in advance in the existing sideband modulation signal classification methods

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  • Sideband modulating signal classifying method and device
  • Sideband modulating signal classifying method and device
  • Sideband modulating signal classifying method and device

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Embodiment 1

[0026] figure 1 It is a flowchart of a method for classifying sideband modulated signals provided by Embodiment 1 of the present invention. Such as figure 1 As shown, it mainly includes the following steps:

[0027] Step 11. Obtain the preprocessed time-domain digital signal x[n].

[0028] The preprocessed time-domain digital signal x[n] can be obtained with the aid of hardware equipment. For example, first, the antenna module is used to receive the signal in the air; then, the received signal is amplified with low noise and the amplified signal is band-pass filtered; then the filtered signal is sent to the analog-to-digital converter for analog Finally, the digital signal after analog-to-digital conversion is sent to the time-domain signal processing module, and the processing of receiving and storing the signal is completed in this module, and then the pre-processed time-domain digital signal x[n] is obtained.

[0029] The time-domain digital signal x[n] may be a single-...

Embodiment 2

[0063] Image 6 It is a schematic diagram of an apparatus for classifying sideband modulated signals provided by an embodiment of the present invention. Such as Image 6 As shown, it mainly includes: an antenna module 71, a low noise amplifier 72, a bandpass filter 73, an analog-to-digital converter 74, and a time-domain signal preprocessing module 75. It is characterized in that the device also includes a signal classification module 76, and the Modules include:

[0064] Enhanced spectral correlation function module 761, used for the spectral correlation function according to the time-domain digital signal x[n] and the conjugate spectral correlation function Get the enhanced spectral correlation function

[0065] Test statistic calculation module 762, used for Calculate the cyclic characteristic spectrum of the time-domain digital signal x[n], and obtain the test statistic T from the cyclic characteristic spectrum p ;

[0066] A comparison module 763, configured t...

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Abstract

The invention discloses a sideband modulating signal classifying method and device. The method includes that an enhancement type frequency spectrum correlation function is acquired according to a frequency spectrum correlation function and a conjugate frequency spectrum correlation function of a time domain digital signal x[n], a cyclical characteristic chromatogram of the time domain digital signal x[n] is figured according to the enhancement type frequency spectrum correlation function, a test statistic Tp is acquired by the cyclical characteristic chromatogram, the test statistic Tp is compared with a threshold value gamma, if Tp is smaller than or equal to gamma, the signal is a single sideband modulating signal, and otherwise, the signal is a double-sideband modulating signal. By means of the method and the device, the application range of sideband signal classification detection is increased.

Description

technical field [0001] The present invention relates to the field of cognitive radio technology, in particular to a method and device for classifying sideband modulated signals. Background technique [0002] The classification and identification of single-sideband modulation signals and double-sideband modulation signals is an important step in the classification of analog modulation signals, and plays an important role in electronic detection and military communications. [0003] Existing classification techniques are all based on predicting or estimating the carrier frequency of the signal. However, in most cases, the carrier frequency information of the signal is difficult to know in advance or be accurately estimated, which causes problems for the classification of sideband modulated signals. Very difficult. Therefore, how to effectively classify sideband modulated signals when the carrier frequency information is unknown has become an important research topic. Conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04B17/00H04B17/382
Inventor 孙欢欢张文逸
Owner UNIV OF SCI & TECH OF CHINA