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An Efficient Broadband Spectrum Sensing Method and System Based on Wavelet Edge Detection

A wideband spectrum and edge detector technology, applied in transmission systems, transmission monitoring, electrical components, etc., can solve the problems of false edge signals, slowness, and wavelet transforms that cannot detect transforms

Active Publication Date: 2022-02-08
SHANGHAI RES CENT FOR WIRELESS COMM +2
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the jitter of the noise PSD will also appear false edge signal
[0008] (3) When the edge of PSD is not very steep, the product of wavelet transform may not be able to detect the slowly transformed spectral edge signal

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  • An Efficient Broadband Spectrum Sensing Method and System Based on Wavelet Edge Detection
  • An Efficient Broadband Spectrum Sensing Method and System Based on Wavelet Edge Detection
  • An Efficient Broadband Spectrum Sensing Method and System Based on Wavelet Edge Detection

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Embodiment Construction

[0064] The technical content of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0065] The high-efficiency broadband spectrum sensing method provided by the present invention uses multi-segment averaging to obtain the average logarithmic PSD, and derives the distribution function of the average logarithmic PSD. In this way, it is easy to obtain the edge signal detection threshold with constant false alarm probability. The simulation results show that the efficient broadband spectrum sensing method provided by the present invention can quickly and accurately detect idle frequency bands in a wide frequency range, which is conducive to efficient use of these spectrum resources and effectively improves the utilization of spectrum resources.

[0066] Such as figure 1 As shown, the high-efficiency broadband spectrum sensing method provided by the present invention includes the following steps: first, ...

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Abstract

The invention discloses an efficient broadband spectrum sensing method and system based on wavelet edge detection. The method comprises the steps of: calculating the average logarithmic power spectral density of the collected time domain data; normalizing the average logarithmic power spectral density, and calculating the centered logarithmic power according to the mean value of the normalized average logarithmic power spectral density spectral density; and computes an estimate of the centered log power spectral density; performs a wavelet transform on the centered log power spectral density estimate and computes wavelet edge detection for the wavelet transform coefficients of the centered log power spectral density estimate device; set the edge signal detection threshold for a given false alarm probability, divide the entire frequency range to be detected into several frequency bands according to the edge signal detection threshold and the wavelet edge detector; use the energy comparison multi-band detection algorithm to classify each frequency band into occupied or idle. By using this method, the idle frequency band can be quickly determined in a wide frequency range, and the spectrum utilization rate is effectively improved.

Description

technical field [0001] The present invention relates to a broadband spectrum sensing method, in particular to a high-efficiency broadband spectrum sensing method based on wavelet edge detection, and also to a corresponding high-efficiency broadband spectrum sensing system, belonging to the technical field of wireless communication. Background technique [0002] Studies have shown that the spectrum shortage problem is basically caused by the low utilization rate of the spectrum. Cognitive Radio (Cognitive Radio) overcomes the spectrum shortage problem by giving secondary users the opportunity to utilize the idle licensed spectrum of primary users. In recent years, wideband spectrum sensing has received great attention. The key to wideband spectrum sensing is to find the frequency position of each subband of the frequency band to be sensed, and then classify each subband as occupied or idle. [0003] In the prior art, a well-known method is wideband spectrum sensing based on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 易辉跃张武雄许晖梁广孙思月
Owner SHANGHAI RES CENT FOR WIRELESS COMM