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Cooperative broadband spectrum sensing method based on double-threshold energy detection

An energy detection and wideband spectrum technology, applied in transmission monitoring, network planning, electrical components, etc., can solve problems such as system detection performance degradation, and achieve the effect of reducing sampling overhead and energy consumption, improving detection performance, and good performance.

Inactive Publication Date: 2017-05-10
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Most of the current cooperative broadband sensing is based on traditional energy detection methods. In scenarios with low signal-to-noise ratio or severe noise changes, the detection performance of the system drops significantly.

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  • Cooperative broadband spectrum sensing method based on double-threshold energy detection
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  • Cooperative broadband spectrum sensing method based on double-threshold energy detection

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0029] Such as figure 1 As shown, assuming that there are M secondary users in a cognitive radio network, the specific implementation of the cooperative broadband spectrum sensing method based on dual-threshold energy detection is as follows: image 3 shown, including the following four steps:

[0030] Step 1: Before sensing the broadband authorized frequency band, the secondary users in the CR network divide the frequency band into N sub-channels respectively, according to the system preset false alarm probability P f use The respective local decision thresholds λ, Q can be obtained by one formula -1 () represents the inverse function of the Q function, and the Q function is defined as n represents the number of sampling points of the received signal, Represents the noise variance; then the secondary user combines the local noise uncertain...

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Abstract

The invention discloses a cooperative broadband spectrum sensing method based on double-threshold energy detection, which is a multiuser multichannel cooperative spectrum sensing method based on double-threshold energy detection. In the method, a secondary user in a cognitive radio network only needs to detect a few narrow band channels during wideband spectrum sensing, make local decisions based on the sensing results of these sub-channels, and upload the judgment results to a data fusion center in a network to perform secondary data fusion so as to make the final global decision. By adoption of the cooperative broadband spectrum sensing method provided by the invention, the requirements of the secondary user for the signal sampling rate and related devices during the broadband spectrum sensing can be reduced, the detection performance of the cognitive radio network is improved, and thus the interference to the normal communication of a primary user is avoided.

Description

technical field [0001] The present invention relates to a cognitive radio spectrum sensing method, in particular to a cooperative broadband spectrum sensing method based on double-threshold energy detection. Background technique [0002] With the rapid development of wireless communication technology, the emergence of various wireless communication systems and services has made wireless spectrum resources increasingly tense, and in sharp contrast to this is the unbalanced use of wireless spectrum resources, the use of authorized spectrum The rate is low, and there are a lot of idle spectrum in both time and space. Cognitive Radio (CR) technology is a kind of real-time change of certain system parameters (such as transmission power, carrier frequency, modulation and coding mode, etc.) An intelligent wireless communication system that guarantees high reliability. In the cognitive radio system, users of licensed spectrum are called primary users, and users of shared spectrum ...

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Application Information

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IPC IPC(8): H04B17/382H04W16/14
CPCH04B17/382H04W16/14
Inventor 王全全王恺于新泉
Owner NANJING UNIV OF POSTS & TELECOMM
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