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Visible light communication multiple access implementation method and system based on subcarrier modulation

A technology of visible light communication and its implementation method, which is applied in the field of multi-access implementation of multi-user visible light communication, which can solve the problems of application limitations, inability to effectively use the frequency band resources of the visible light system, and the inability to realize bandwidth allocation for multiple users, etc., to reduce PAPR , Realize high-speed multi-user access and increase utilization

Inactive Publication Date: 2014-07-16
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The current direct modulation method of visible light system cannot effectively utilize the frequency band resources in the visible light system, and cannot realize effective bandwidth allocation among multiple users, so the application in the high-speed visible light communication multiple access system is limited

Method used

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  • Visible light communication multiple access implementation method and system based on subcarrier modulation
  • Visible light communication multiple access implementation method and system based on subcarrier modulation
  • Visible light communication multiple access implementation method and system based on subcarrier modulation

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Embodiment Construction

[0034] The subcarrier coding and modulation scheme and the implementation process of frequency band allocation will be completely described below according to the multi-user visible light communication multiple access implementation method based on subcarrier modulation proposed by the present invention. At the same time, in order to reflect the effect of this scheme, the actual multi-user multiple access experiment results will be given.

[0035] The subcarrier modulation scheme proposed by the present invention is described as follows.

[0036] Each user's signal is first multi-stage coded to increase the bit rate of transmission. Set the baseband signal transmitted by general visible light communication Expressed as follows:

[0037] (1)

[0038]here, Represents the baseband center frequency after modulation to visible light. In order to simplify the representation, it is represented by a single frequency. represents the phase of visible light, A ...

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Abstract

The invention belongs to the technical field of visible light communication and particularly relates to a visible light communication multiple access implementation method and system based on subcarrier modulation. The method and system are mainly based on the subcarrier modulation technology and the band splitting technology, multi-order encoding with high spectrum efficiency is utilized, and high-speed multiple access based on the visible light communication is achieved through the bandwidth allocation scheme with optimized configuration. The visible light communication multiple access implementation system comprises a high-order coding modulation module, a subcarrier modulation module, a photoelectric detector, a digital band-pass filter, a channel estimation module and a decoding module, wherein the high-order coding modulation module and the subcarrier modulation module are connected with the sending end in sequence; the photoelectric detector, the digital band-pass filter, the channel estimation module and the decoding module are connected with the receiving end in sequence. On the condition of ensuring the coverage area, the high-speed visible light communication multiple access with the wholly covered spectrum resources, the high spectrum efficiency and the exclusive user bandwidth is achieved.

Description

technical field [0001] The invention belongs to the technical field of visible light communication, and in particular relates to a method and system for realizing multi-access of multi-user visible light communication. Background technique [0002] With the rapid popularization of computers and smart devices, the category of mobile digital terminals has undergone revolutionary changes, and the bandwidth requirements for access networks are getting higher and higher. Although today's access technologies are constantly developing to meet the needs of many users, the "last mile" dilemma of fiber-to-the-home, the shortage of spectrum resources in wireless access networks, and the inadequacy of radio-on-fiber (RoF) technology Maturity and electromagnetic radiation both restrict further breakthroughs in access rates. Therefore, it is necessary to develop a new access method that broadens spectrum resources, is green and energy-saving, and is mobile, and visible light communicatio...

Claims

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Application Information

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IPC IPC(8): H04B10/116
Inventor 迟楠王源泉
Owner FUDAN UNIV
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