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, undetectable transformations by wavelet transform, slowness, etc., so as to improve spectrum utilization and alleviate spectrum problems. Effects of shortage problems
Active Publication Date: 2020-03-31
SHANGHAI RES CENT FOR WIRELESS COMM +2
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[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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[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] like figure 1 As shown, the high-efficiency broadband spectrum sensing method provided by the present invention includes the following steps: first, cal...
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The invention discloses an efficient broadband spectrum sensing method and system based on wavelet edge detection. The method comprises the following steps: calculating the average logarithm power spectral density of acquired time domain data; normalizing the average logarithm power spectral density, and calculating the centralized logarithm power spectral density according to the mean value of the normalized average logarithm power spectral density; calculating an estimated value of the centralized logarithm power spectral density; performing wavelet transformation on the estimated value of the centralized logarithm power spectral density and calculating a wavelet transformation coefficient of the estimated value of the centralized logarithm power spectral density; setting an edge signaldetection threshold when a false alarm probability is given, and dividing the whole frequency range to be detected into a plurality of frequency bands according to the edge signal detection thresholdand the wavelet edge detector; and classifying each frequency band into occupied or idle frequency bands by utilizing an energy comparison multi-frequency-band detection algorithm. By using the method, the idle frequency band can be quickly determined in a very 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...
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Login to View More 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