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Wideband frequency spectrum sensing method based on comprehensive co-prime analysis and device thereof

A wideband spectrum, original co-prime technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as center frequency ambiguity, cross-term interference, etc., to reduce sampling rate, high anti-noise performance, save Effects of the Signal Reconstruction Step

Inactive Publication Date: 2016-10-12
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] When the classic mutual prime sensing method is used to analyze broadband signals, it will produce very serious cross-term interference, which will appear as multiple false peaks with large amplitudes on the spectrogram, so that the center frequency of each real broadband spectrum will change. blurred

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  • Wideband frequency spectrum sensing method based on comprehensive co-prime analysis and device thereof
  • Wideband frequency spectrum sensing method based on comprehensive co-prime analysis and device thereof
  • Wideband frequency spectrum sensing method based on comprehensive co-prime analysis and device thereof

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Embodiment 1

[0070] The flow of the broadband spectrum sensing method proposed in the embodiment of the present invention is as follows figure 1 As shown, the method mainly includes mutual prime perception processing of signals, energy detectors and spectrum combination calculation, as described below for details:

[0071] 101: Process the input signal to obtain the output of the original mutual prime spectrum;

[0072] 102: Process the signal after two times of downsampling to obtain a complementary coprime spectrum output;

[0073] 103: Obtain the calculation result of the first indicator and the calculation result of the second indicator by using the energy detection result output by the original co-prime spectrum and the energy detection result output by the complementary co-prime spectrum of the energy detector;

[0074] 104: Obtain an indicative power spectrum by using the calculation result of the first indicator and the calculation result of the second indicator.

[0075] Wherein...

Embodiment 2

[0088] The scheme in embodiment 1 is described in detail below in conjunction with specific calculation formulas and examples, see the following description for details:

[0089] 201: Mutual prime perception processing of signals;

[0090] Step 1 performs two-way downsampling on the input signal x(n), the downsampling factors are M and N (M and N are relatively prime integers), and two sparse signals x are obtained u (n) and x v (n);

[0091] Step 2 to x u (n) and x v (n) Perform polyphase filtering respectively, and output two multi-channel sparse signals: and Where 0≤p≤M-1, 0≤q≤N-1;

[0092] Among them, the corresponding multi-channel output sequence can be obtained from two multi-channel sparse signals respectively

[0093] Step 3 at each time n, output the sequence to the multi-channel Perform M-point IDFT to get the output sequence {u k (n),k=0,...,M-1}.

[0094] Similarly, for multi-channel output sequences Perform N-point IDFT to get the output sequence...

Embodiment 3

[0116] The principle of the scheme in Embodiments 1 and 2 is described in detail below in conjunction with specific calculation formulas, see the following description for details:

[0117] 301: Original Mutual Prime Spectrum Analyzer

[0118] figure 2 , the input signal x(n) is a hypothetical Nyquist sample, and its sampling interval T=1 / f Nyq , with downsampling factors N and M (both are required to satisfy the mutual prime relationship) and downsampled in parallel to form two low-rate streams x u (n) and x v (n) (this is equivalent to using two sampling rates for f Nyq / N,f Nyq The ADC of / M directly discretizes the input analog signal in parallel); then x u (n) (or x v (n)) Do M-way (or N-way) polyphase decomposition, and pass through the polyphase sub-filter E p (z) and R q (z) perform filtering, and then perform M-point IDFT (or N-point IDFT) on the parallel output of each phase filter, and finally perform two-way IDFT (that is, multiply the corresponding IDFT m...

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Abstract

The invention discloses a wideband frequency spectrum sensing method based on comprehensive co-prime analysis and a device thereof. The sensing method comprises the following steps: processing input signals to acquire original co-prime spectrum output; processing signals obtained after twice down-sampling to acquire complementary co-prime spectrum output; acquiring a calculation result of a first indicator and a calculation result of a second indicator respectively by using energy detection results of the original co-prime spectrum output and the complementary co-prime spectrum output which are put through energy detectors; and acquiring an indicative power spectrum through the calculation result of the first indicator and the calculation result of the second indicator. The sensing device comprises a microcontroller, an output driver and a display circuit. The sensing method can be used to comprehensively detect the statistic distribution characteristics of energy output of an original co-prime spectrum analyzer and a complementary co-prime spectrum analyzer under the precondition of a rate far lower than the Nyquist rate and blind estimation.

Description

technical field [0001] The present invention relates to the field of digital signal processing, in particular to a broadband spectrum sensing method and device based on comprehensive co-prime analysis, in particular to signal undersampling, co-prime sensing, polyphase filtering, spectrum estimation, and filter design. Background technique [0002] The radio frequency spectrum is a country's strategic resource. If it is effectively developed and utilized, it can create a lot of material wealth and trigger huge social benefits. The traditional allocation of wireless spectrum resources is allocated to primary users (Primary Users, PUs) in the form of licenses issued by government departments. The shortage of spectrum resources has become a prominent problem. [0003] To cope with the ever-increasing bandwidth demands of today's massive mobile wireless devices and systems, cognitive radio (CR) technology emerges as the times require. As a promising wireless communication techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 黄翔东韩溢文
Owner TIANJIN UNIV