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A method for suppressing downlink interference in an indoor visible light communication system

A technology for visible light communication and interference suppression, applied in the field of optical communication, to achieve the effect of improving system performance, minimizing interference, and realizing dynamic frequency reuse

Active Publication Date: 2021-11-09
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this kind of scheme at present is how to choose or improve the appropriate algorithm to search for the best scheme

Method used

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  • A method for suppressing downlink interference in an indoor visible light communication system
  • A method for suppressing downlink interference in an indoor visible light communication system
  • A method for suppressing downlink interference in an indoor visible light communication system

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Embodiment Construction

[0025] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] The present invention provides a method for suppressing downlink interference of an indoor visible light communication system. In a specific indoor environment, an improved tabu search algorithm is used to search for an optimal frequency reuse scheme, so that users with interference use different frequency bands to suppress interference. In this way, the system communication performance is improved, and the system communication rate and average spectrum efficiency are improved. The present invention first constructs a system channel model according to the input system parameters, and the channel gain of the direct link is:

[0027]

[0028] In formula (1), A is the effective receiving area of ​​the PD receiver, d is the straight-line distance between the LED and the PD receiver, λ is the line-of-sight link interruption probability, φ and ψ repr...

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Abstract

The invention relates to a method for suppressing downlink interference of an indoor visible light communication system, and belongs to the technical field of optical communication. The method of the present invention uses an improved tabu search algorithm to search for an optimal dynamic frequency multiplexing scheme, suppresses inter-cell interference and inter-user interference in a visible light communication system, and improves system communication performance. In the present invention, the interference graph of the joint transceiver end is established as the basis for clarifying the interference relationship; the algorithm solution structure and the neighborhood structure based on the interference graph are designed; the taboo table strategy in the tabu process is improved to avoid falling into local optimum; according to The load situation dynamically divides the frequency band to realize the dynamic multiplexing of the frequency. The method of the invention can effectively suppress inter-cell interference and inter-user interference in an indoor visible light communication system, and can improve the data rate and average spectrum efficiency of system communication on the basis of ensuring communication fairness.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and relates to a method for suppressing downlink interference of an indoor visible light communication system. Background technique [0002] With the rapid increase in the number of intelligent mobile terminals and the sharp increase in the demand for multimedia services with high quality of service requirements, the existing radio frequency network is facing great challenges. Visible light communication technology using commercially available LEDs has become a key technology for next-generation wireless communication networks due to its advantages of low power consumption, high security, no electromagnetic interference, and no need for spectrum certification. In practical application scenarios, the LEDs at the transmitting end of the visible light communication system are usually densely deployed on the ceiling to meet the needs of lighting and high-speed data transmission. At thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B15/00
Inventor 陈勇李绍举刘焕淋
Owner CHONGQING UNIV OF POSTS & TELECOMM