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Downlink coverage uniformity optimization method for indoor visible light communication system

A technology of coverage uniformity and visible light communication, applied in the field of optical communication

Active Publication Date: 2018-08-03
CHONGQING UNIV OF POSTS & TELECOMM
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The problem with such schemes at present is how to choose or improve the appropriate algorithm

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  • Downlink coverage uniformity optimization method for indoor visible light communication system
  • Downlink coverage uniformity optimization method for indoor visible light communication system
  • Downlink coverage uniformity optimization method for indoor visible light communication system

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Embodiment Construction

[0040] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041]The present invention provides a method for optimizing downlink coverage uniformity of an indoor visible light communication system. In a specific indoor environment, an improved genetic simulated annealing algorithm is used to find a set of optimal power adjustment factors to adjust the transmit power of the LED array, so that The received light power distribution on the receiving surface should be as uniform as possible. The present invention first constructs the chromosome according to the input system parameters, adopts the decimal coding method to construct the chromosome, and the gene in the chromosome is the power adjustment factor k of the LED l , k l ∈(0,1). A group of power regulators together form a chromosome: In the algorithm, a fitness function based on the received optical power difference information of the receivi...

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Abstract

The invention relates to a downlink coverage uniformity optimization method for an indoor visible light communication system, belonging to the technical field of optical communication. The method of the invention includes the following steps: searching a set of optimal power adjustment factors by adopting an improved genetic simulated annealing algorithm, and adjusting the transmitting power of anindoor LED array to ensure that the distribution of the receiving optical power on a receiving plane is more uniform; based on receiving optical power information of all receiving points on the receiving plane, designing a fitness function to serve as a basis for selecting an individual power adjustment factor; dividing a population into two sub-populations in an algorithm flow, and separately performing crossover operations and mutation operations on the two sub-populations; and designing an adaptive mutation probability formula according to the information whether the optimal individual inthe population changes. According to the scheme of the invention, the uniformity of downlink optical power distribution of the indoor visible light communication system can be effectively improved, the difference of the receiving optical power at different locations on the receiving plane can be reduced, and the fairness of system lighting and communication can be improved.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and relates to a method for optimizing downlink coverage uniformity of an indoor visible light communication system. Background technique [0002] Compared with traditional radio frequency (Radio Frequency, RF) communication, indoor visible light communication based on light emitting diode (LED, light emitting diode) has the advantages of low power consumption, high security, no electromagnetic interference, large available bandwidth and no certification, etc. application development prospects. In practical application scenarios, visible light communication systems usually need to arrange multiple LED arrays to achieve lighting and high-density, high-speed data transmission needs. However, the inherent Lambertian radiation model of the LED and the multipath effect of the channel will cause uneven distribution of received optical power and illumination intensity on the receiving pla...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116G06N3/12G06N3/00
CPCG06N3/008G06N3/126H04B10/116
Inventor 刘焕淋林振宇陈浩楠陈勇夏培杰
Owner CHONGQING UNIV OF POSTS & TELECOMM
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