Spectrum sensing method and device based on time-domain energy and frequency-domain spectral entropy

A spectrum sensing and time-domain energy technology, applied in the field of spectrum sensing methods and devices, can solve the problems of large data processing volume and high hardware complexity

Active Publication Date: 2014-10-29
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Compared with time-domain energy detection, the amount of...

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  • Spectrum sensing method and device based on time-domain energy and frequency-domain spectral entropy
  • Spectrum sensing method and device based on time-domain energy and frequency-domain spectral entropy
  • Spectrum sensing method and device based on time-domain energy and frequency-domain spectral entropy

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Embodiment Construction

[0060] A spectrum sensing method based on time domain energy and frequency domain spectral entropy, such as figure 1 As shown, including the following steps:

[0061] (1) First establish a frequency band pool memory, namely memory 0. Each storage unit in memory 0 stores a frequency control word that controls the radio frequency front end to work in a certain frequency band. The frequency control word corresponds to the center frequency of the radio frequency front end working frequency band. The memory 0 outputs the first frequency control word to the radio frequency front end to control the radio frequency front end to work in the frequency band corresponding to the first frequency control word. After that, the RF front-end works in this frequency band.

[0062] (2) The RF front-end outputs signals to the A / D conversion module, and the A / D conversion module sends its output digital signal to the energy detection module. The A / D conversion module used to realize the digital conve...

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Abstract

The invention discloses a spectrum sensing method and device based on time-domain energy and frequency-domain spectral entropy. The method comprises the following steps: detecting by a mode in combination of energy detection and frequency-domain spectral entropy detection; detecting the time-domain energy in case of large signal-to-noise ratio or poor channel condition; otherwise, detecting the frequency-domain spectral entropy; generating an energy pool and a spectral entropy pool for an idle frequency band according to the detection result; sequencing in the pools according to the statistical value. According to the method, the channel state of the idle frequency brand can be initially estimated, which is beneficial for a cognitive user to flexibly select the idle frequency band to communicate, and therefore, the influence of noise uncertainty on the spectrum detection can be effectively lowered down, and the detection accuracy can be improved; in addition, the self-adaptive double-threshold method is carried out, and high and low thresholds are self-adaptively adjusted according to the detection conditions, thus the mis-judgment probability can be reduced, and the detection accuracy can be raised; moreover, times for performing frequency domain detection again are decreased, the time cost for detection is reduced, and as a result, the data transmission time of the cognitive user is prolonged.

Description

Technical field [0001] The invention belongs to the field of communication technology, and specifically relates to a spectrum sensing method and device based on time domain energy and frequency domain spectrum entropy. Background technique [0002] With the rapid development of wireless communication, people's demand for wireless services is also increasing. However, limited spectrum and inefficient and fixed spectrum allocation policies have led to an increasing scarcity of spectrum resources, and the scarcity of spectrum resources has become one of the bottlenecks restricting the development of wireless communication technologies. Judging from the current spectrum utilization rate, quite a lot of licensed frequency bands are not used, causing the so-called "spectrum holes." A smart wireless communication technology-cognitive radio spectrum sensing technology came into being. Cognitive radio spectrum sensing technology monitors the target frequency band in real time, and allow...

Claims

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Application Information

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IPC IPC(8): H04W16/14H04B17/00
Inventor 肖海林刘彩丽王成旭贺栋梁胡立坤许旻闫坤
Owner GUILIN UNIV OF ELECTRONIC TECH
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