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Visible light communication multiple access method and system based on carrier-free amplitude-phase modulation

A carrier-free amplitude and phase, visible light communication technology, applied in the field of visible light communication, can solve the problems of low utilization rate of quadrature amplitude modulation bandwidth, reducing the number of users in the access system, and unfavorable high-speed system implementation, and achieves flexible division and utilization, The effect of making up for channel impairments and flexible frequency band division

Active Publication Date: 2016-09-28
FUDAN UNIV
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Problems solved by technology

[0008] 1. The quadrature amplitude modulation and orthogonal frequency division multiplexing schemes require the use of up-conversion in the electrical domain, which involves multiple mixers and radio frequency (RF) sources, increasing the complexity of the system
[0009] 2. The bandwidth utilization rate of orthogonal amplitude modulation is not high, which reduces the number of users that the access system can support; the orthogonal frequency division multiplexing modulation scheme has a large computational complexity in the process of signal generation and recovery, which is not conducive to high-speed system realization

Method used

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  • Visible light communication multiple access method and system based on carrier-free amplitude-phase modulation
  • Visible light communication multiple access method and system based on carrier-free amplitude-phase modulation
  • Visible light communication multiple access method and system based on carrier-free amplitude-phase modulation

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Embodiment Construction

[0041] The following will fully describe the carrierless amplitude phase modulation scheme and the implementation process of frequency band allocation according to the implementation method of multi-user visible light communication multiple access based on carrierless amplitude phase 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.

[0042] The carrier-free amplitude-phase modulation scheme proposed by the present invention is described as follows.

[0043] Each user's signal is first multi-stage coded to increase the bit rate of transmission. In order to match the working rate of the filter bank, the input signal needs to be up-sampled first, and at the same time, the I and Q channels are separated and sent to a pair of shaping filters respectively. Next, the carrier-free amplitude-phase modulation process is performed.

[0044] A carrierless...

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Abstract

The invention belongs to the technical field of visible light communication, and specifically relates to a multi-access method and system for visible light communication based on carrierless amplitude-phase modulation. This method is mainly based on the carrier-free amplitude-phase modulation technology, and realizes high-speed multiple access based on visible light communication by configuring the center frequency of the matching filter at the receiving end. The carrier-free amplitude-phase modulation technology can simplify the system configuration and realize multi-level coding. At the same time, combined with the channel pre-equalization and post-equalization technology, the reliability and spectrum efficiency of the system are improved. The present invention can realize the full coverage of the entire spectrum resource and the high-speed visible light communication multiple access with exclusive bandwidth for each user under the condition of ensuring the coverage.

Description

technical field [0001] The invention belongs to the technical field of visible light communication, and in particular relates to a multi-access method and system for visible light communication. Background technique [0002] The rise of "smart home" and the rapid popularization of computers, smart devices and smart homes have brought about revolutionary changes in the field of mobile digital terminals and communication media, and brought a huge challenge to traditional access network technologies. Today's world is undergoing a profound change in the "Anywhere, anytime" access method. The society is also calling for an access method that broadens spectrum resources, is green and energy-saving, and is mobile. Visible Light Communication (Visible Light Communication) has emerged as the times require. Time magazine named it one of the world's top 50 technological inventions in 2011. [0003] Visible light communication uses light-emitting diodes (LEDs) to transmit information w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34H04L25/03H04B10/116
Inventor 迟楠王一光
Owner FUDAN UNIV
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