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Method for realizing spectrum sensing based on bi-spectrum diagonal slice

A diagonal and slicing technology, applied to baseband system components, transmission monitoring, digital transmission systems, etc., can solve problems such as poor detection performance, complex calculation, and complex implementation, and achieve the effect of reducing calculation time

Inactive Publication Date: 2013-07-10
SAMSUNG ELECTRONICS CO LTD +1
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Problems solved by technology

[0010] In the spectrum sensing method listed in IEEE 802.22 standard draft D1.0, the method of using covariance matrix combined with eigenvalues ​​is proposed, but there are complex calculations, and poor detection performance in the case of low signal-to-noise ratio, which cannot effectively combat noise uncertainty Sexual shortcomings
In addition, there is a proposal in 802.22 (802.22-07 / 0359r0) that uses the different properties of the high-order statistics of the signal and the high-order statistics of the noise to distinguish between the signal and the noise. Since the high-order statistics of Gaussian noise are 0, and The high-order statistics of the signal are not 0, but the proposed method needs to calculate multi-order statistics, which is complicated to implement and not intuitive enough

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  • Method for realizing spectrum sensing based on bi-spectrum diagonal slice
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  • Method for realizing spectrum sensing based on bi-spectrum diagonal slice

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[0026] The method of the present invention constitutes as figure 2 shown. figure 2 A schematic diagram of the spectrum sensing function module based on bispectral diagonal slices is given. After the received radio frequency signal is down-converted to an intermediate frequency, analog-to-digital conversion and down-sampling are performed, and then the bispectral diagonal slice is calculated, and the frequency band where the main user signal exists is determined according to the threshold.

[0027] The biggest feature of high-order statistics is that the high-order statistics of Gaussian noise (above the second order) are equal to zero, so Gaussian noise can be suppressed through high-order statistics, but traditional high-order statistics are more complicated to calculate, so you can choose a simplified Diagonal slice analysis to simplify the detection process. The bispectrum is different from the traditional power spectrum. The traditional power spectrum is a second-order...

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Abstract

The invention discloses a method for realizing spectrum sensing based on a bi-spectrum diagonal slice in cognitive radio. The method comprises the following steps: after an antenna receives radio frequency signals, performing down-conversion, namely, changing from a radio frequency to an intermediate frequency or a base band; obtaining receiving signals in a frequency band to be sensed by filtering signals after the down-conversion; sampling and quantizing the filtered signals to obtain a signal sequence; computing the bi-spectrum diagonal slice of the sampled receiving signal sequence; and comparing an amplitude value of the bi-spectrum diagonal slice with a threshold and distinguishing an idle spectrum hole. By using the method of the invention, idle spectrum resources can be searched quickly and effectively and computing time is reduced.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for realizing spectrum sensing based on bispectral diagonal slices. Background technique [0002] Cognitive Radio (CognitiveRadio) is a spectrum sharing technology proposed to solve the shortage of available spectrum resources in future wireless communications and the low utilization rate of traditional fixed spectrum allocation mechanisms. Cognitive Radio performs spectrum sensing (SpectrumSensing) on ​​the surrounding wireless environment , and based on the results of spectrum sensing, select an appropriate idle working frequency band and adjust the wireless transmission parameters, which avoids the interference of the licensed user system on the frequency band and ensures the transmission of cognitive devices. A key technology and premise of implementation in cognitive radio is how to ensure accurate and fast spectrum sensing. [0003] In cognitive radio systems, common sin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00H04B17/30H04L25/02H04L27/00
Inventor 许方敏周雷
Owner SAMSUNG ELECTRONICS CO LTD
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