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Spectrum sensing data processing method based on discrete Fourier transformation

A discrete Fourier transform and Fourier transform technology, applied in the field of spectrum sensing data processing based on discrete Fourier transform, can solve the problems of high cost, inability to accurately reflect the channel state, without considering the frequency characteristics of baseband signals, etc. To achieve the effect of improving data processing efficiency

Active Publication Date: 2014-03-26
TONGJI UNIV
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Problems solved by technology

However, there are several defects in this method: 1. The determination of the spectrum channel state in this patent requires the use of dual receiving antennas, and the cost is relatively high
2. In the process of determining the channel state, the method adopted does not take into account the frequency characteristics of the baseband signal at zero frequency, so it cannot accurately reflect the channel state

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  • Spectrum sensing data processing method based on discrete Fourier transformation
  • Spectrum sensing data processing method based on discrete Fourier transformation
  • Spectrum sensing data processing method based on discrete Fourier transformation

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Embodiment 1

[0053] Example 1: Assume that the frequency band range of the spectrum sensing we are concerned about is Hz, so a bandpass filter needs to be added at the receiving end. We further assume that the received signal in the time domain is ( ), and its corresponding Fourier transform in the frequency domain is ( ). See details figure 1 .

[0054] According to the duality of Fourier transform, we can get:

[0055] (1)

[0056] (2)

[0057] Equations (1)-(2) express: if yes The Fourier transform of , then The Fourier transform of ( ). From figure 1 In we can find that, Indicates that the highest frequency is low pass signal of frequency-domain properties. Thus, according to the Nyquist sampling criterion, can be given like this:

[0058] (3)

[0059] in is the sampling function. In equation (3), wi...

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Abstract

The invention relates to a spectrum sensing data processing method based on discrete Fourier transformation. The spectrum sensing data processing method based on the discrete Fourier transformation specifically comprises the steps that band-pass filtering is carried out on received signals; down-conversion is carried out on band-pass signals; low-pass filtering is carried out on demodulated signals; A / D conversion is carried out on the signals; minimum sampling frequency is given according to frequency-domain characteristics of the signals, and fast Fourier transformation is carried out on the signals; lastly, obtained discrete data are screened, and only discrete Fourier transformation coefficients capable of reflecting the real conditions of all information channels are reserved. According to the spectrum sensing data processing method based on the discrete Fourier transformation, the sampling process of the fast Fourier transformation and a method for extracting wireless spectrum characteristics are provided. In addition, the spectrum sensing data processing method based on the discrete Fourier transformation further improves information processing efficiency, and under the premise that the expression of the frequency-domain characteristics of the signals is not influenced, the total number of discrete points is 25% smaller than the total number of original discrete value through the reasonable screening of the discrete data.

Description

technical field [0001] The invention belongs to the technical fields of signal processing and wireless communication, and in particular relates to a spectrum sensing data processing method based on discrete Fourier transform. Background technique [0002] In cognitive radio networks, secondary users can obtain broadband wireless transmission by accessing vacant spectrum. However, secondary users are unlicensed users, and need to quickly and accurately detect idle spectrum in the radio environment to avoid interference to licensed users. Therefore, it is necessary to design a set of reasonable and scientific spectrum sensing data processing methods to accurately extract the feature quantity on each channel and reduce the amount of data to be processed to a certain extent. [0003] In Chinese Patent No. 201110305767, a spectrum sensing method based on the signal spectrum envelope is designed, which uses two receiving antennas to receive time-domain continuous radio frequency...

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Application Information

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IPC IPC(8): H04B17/00H04W16/14H04B17/309H04B17/382
Inventor 黄新林徐源吴祥吴俊
Owner TONGJI UNIV
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