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Stepped frequency spectrum sensing method based on energy and covariance detection

A spectrum sensing and energy detection technology, applied in the field of spectrum sensing of cognitive radio, can solve the problem of low detection accuracy

Inactive Publication Date: 2015-11-04
HARBIN INST OF TECH
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Problems solved by technology

[0006] The present invention aims to solve the problem of low detection accuracy of existing energy detection methods, thereby providing a step-by-step spectrum sensing method based on energy and covariance detection

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  • Stepped frequency spectrum sensing method based on energy and covariance detection
  • Stepped frequency spectrum sensing method based on energy and covariance detection
  • Stepped frequency spectrum sensing method based on energy and covariance detection

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specific Embodiment approach 1

[0061] The specific embodiment one, based on energy and covariance detection step-by-step spectrum sensing method, it is realized by the following steps:

[0062] Step 1. At the cognitive end, energy detection is first performed. The detection method is as follows: figure 1 Shown:

[0063] figure 1 Among them, r(n) is the actual signal received by the cognitive user at time n; x(n) is the signal transmitted by the primary user; w(n) is the Gaussian noise (AWGN channel), and its mean value is 0, and the variance is Value. The spectrum sensing problem of cognitive radio system can be equivalent to a binary hypothesis model:

[0064] H 0 : r ( n ) = w ...

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Abstract

The invention discloses a stepped frequency spectrum sensing method based on energy and covariance detection, relates to the frequency spectrum sensing field of cognitive radio, and aims at solving the problem that a present energy detection method is low in the detection accuracy. Energy detection is carried out at a user end; if it is detected that a main user uses an authorized frequency spectrum, a cognitive user keeps silent; if a result of energy detection is a frequency spectrum cavity, secondary detection, namely covariance detection, is needed; and a result of the covariance detection is still that the authorized frequency spectrum is not used, the cognitive user can occupy the authorized frequency spectrum for communication. Thus, advantages of energy detection and covariance detection are effectively integrated; when the channel state is sound, energy detection which is easy to implement is carried out to sense the frequency spectrum; and when the signal to noise ratio is low, secondary detection is carried out by utilizing the high statistic characteristics of covariance detection, and thus, the detection accuracy is improved.

Description

technical field [0001] The invention relates to the field of spectrum sensing of cognitive radio. Background technique [0002] With the rapid development of wireless communication technology, people's demand for frequency band resources also increases sharply. However, the utilization of spectrum resources is still at a relatively low level in many respects: the existing wireless communication technology occupies a large amount of spectrum resources, and the spectrum that can be used for the development of new services is less and less. Lots of idling. The results of monitoring and research on the current use of spectrum resources show that the idle ratio of licensed spectrum varies from 15% to 85% over time and geographically. [0003] In order to solve the scarcity of spectrum resources and its allocation contradiction, Cognitive Radio technology (Cognitive Radio, CR) is proposed, which is regarded as the most promising technology to solve the current shortage of spectr...

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Application Information

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IPC IPC(8): H04W72/08H04B17/382
CPCH04W72/541Y02D30/70
Inventor 贾敏王雪贲放郭庆顾学迈刘晓锋
Owner HARBIN INST OF TECH
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