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Downlink interference suppression method for an indoor visible light communication system

A technology of visible light communication and interference suppression, applied in the field of optical communication, to improve system performance, minimize interference, and achieve dynamic frequency multiplexing

Active Publication Date: 2019-05-14
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

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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  • Downlink interference suppression method for an indoor visible light communication system
  • Downlink interference suppression method for an indoor visible light communication system
  • Downlink interference suppression method for 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 downlink interference suppression method for an indoor visible light communication system, and belongs to the technical field of optical communication. According to the method, the optimal dynamic frequency reuse scheme is searched by adopting the improved tabu search algorithm, inter-cell interference and inter-user interference in the visible light communication systemare inhibited, and the communication performance of the system is improved. According to the invention, an interference pattern of a combined receiving and transmitting end is established as a basisfor determining an interference relationship; Designing an algorithm solution structure and a neighborhood structure based on an interference pattern; A tabu table strategy in the tabu process is improved so as to avoid falling into local optimum; And dynamically dividing the frequency band according to the load condition to realize the dynamic multiplexing of the frequency. According to the method, inter-cell interference and inter-user interference in an indoor visible light communication system can be effectively suppressed, and the data rate and the average spectrum efficiency of system communication can be improved on the basis of ensuring the 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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IPC IPC(8): H04B10/116H04B15/00
Inventor 陈勇李绍举刘焕淋
Owner CHONGQING UNIV OF POSTS & TELECOMM
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