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Method for selecting multi-user sensing channel in cognitive sensor network

A sensor network, multi-user technology, applied in the field of sensing channel selection scheme

Active Publication Date: 2013-12-04
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical application scenarios, due to various reasons, CR detection technology only relies on a pure physical layer detection algorithm, which has certain limitations in improving spectrum utilization and protecting primary users.

Method used

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  • Method for selecting multi-user sensing channel in cognitive sensor network
  • Method for selecting multi-user sensing channel in cognitive sensor network
  • Method for selecting multi-user sensing channel in cognitive sensor network

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Experimental program
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Embodiment Construction

[0025] (1) Optimization of detection time in a single-user single-channel scenario

[0026] When the primary user j does not exist, use C 0 Denotes the throughput obtained at secondary user i. The signal-to-noise ratio at secondary user i can be expressed as P s Indicates the received power of the secondary user, N 0 Indicates the noise power. Then C 0 = log 2 (1+SNR i ). For a given available frequency band, define P(H 1 ) represents the probability that the primary user j exists, P(H 0 ) represents the probability that the primary user j does not exist, it can be seen that P(H 0 )+P(H 1 )=1.

[0027] When secondary user i perceives channel j, if primary user j does not exist, secondary user i will not generate false alarms, and the throughput that secondary user i can achieve is The probability of this happening is (1-P f )P(H 0), where P f Indicates the false alarm probability.

[0028] Then the throughput available to secondary user i Can be expressed ...

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Abstract

In cognitive radio, frequency spectrum sensing is an important premise and a core link for realizing the frequency spectrum dynamic access. The invention aims to provide a method for selecting a multi-user sensing channel in a cognitive sensor network, which comprises the following steps of: on an energy detection method, sensing normalized throughput acquired by a primary user channel from a maximized secondary user; using a detection time optimal scheme to budget the maximum throughput of all the secondary users and the selected channels of the secondary users; constructing a maximum throughput matrix; using a bidiagraph to express the channel selection problem under a multi-user multi-channel environment; converting a maximization and minimization problem into a unified minimization solution problem; and under the limit of target detection probability, adopting an improved Hungarian algorithm for the optimal selection of the sensing channel. By the method disclosed by the invention, the minimized throughput of the whole secondary user network can be greatly improved.

Description

technical field [0001] The invention relates to a sensing channel selection scheme used in a multi-user multi-channel scenario in a cognitive radio network, and belongs to the technical field of communication. Background technique [0002] In recent years, with the extensive development of wireless communication services, spectrum resources have become increasingly scarce. The main reason is the unreasonable use of wireless spectrum access technology, that is, the existing wireless communication systems all use low-efficiency fixed channel allocation. Strategy. Cognitive radio is considered to be one of the most effective new technologies to solve this problem. It allows cognitive users to share the frequency band without affecting the normal communication of legitimate users in the frequency band. [0003] In CRN (CognitiveRadioNetwork cognitive radio network), the accurate and fast detection of spectrum occupancy in the surrounding wireless environment by CRN is an import...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00H04W16/14H04L25/02H04B17/382
Inventor 朱琦叶军朱洪波杨龙祥
Owner NANJING UNIV OF POSTS & TELECOMM
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