Method of modulating variable pulse amplitude position and improving error rate for visible light communication system

A technology of visible light communication and pulse amplitude, applied in transmission systems, digital transmission systems, short-distance systems, etc., can solve the problems of high modulation complexity, high bandwidth efficiency, and high power efficiency, and achieve high power efficiency and bandwidth efficiency The effect of high and reduced power requirements

Active Publication Date: 2014-11-19
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, some modulation methods have higher power efficiency, some modulation methods have higher bandwidth efficiency, and some modulation methods have higher complexity.

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  • Method of modulating variable pulse amplitude position and improving error rate for visible light communication system
  • Method of modulating variable pulse amplitude position and improving error rate for visible light communication system
  • Method of modulating variable pulse amplitude position and improving error rate for visible light communication system

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Embodiment Construction

[0048] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0049] figure 1 It is an overall flow chart of the method of the present invention. As shown in the figure, the visible light communication system includes a signal sending end A, an optical wireless communication channel B, and a signal receiving end C. The data signal is sent as an optical signal through the transmitting end, then received by the receiving end through the visible light wireless communication channel, and finally converted into an electrical signal for output.

[0050] Signal sending end A is composed of encoding module, modulation module, LED driver module, Bias-Tee signal coupling module and LED light source module. At the signal sending end, the output end of the white LED driver module is connected to the DC input end of the Bias-Tee signal coupling module, and the output end of the signal modulation module A2 is connec...

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Abstract

The invention discloses a method of modulating a variable pulse amplitude position and improving an error rate for a visible light communication system, belonging to the field of visible light wireless communication technologies. According to the method, modulation of the variable pulse amplitude position is utilized in a modulation module of a signal transmitting end, a modulation method is multi-system modulation capable of combining pulse amplitude position modulation and pulse width modulation, transmission of communication data is guaranteed while a system dimming function is provided, improvement of the communication quality mainly includes that the transmission rate can be improved under the condition of the same symbol rates, the advantages of high multi-system modulation bandwidth efficiency and high pulse position modulation power efficiency are combined, the spectral efficiency can be effectively improved, and compared with the other multi-system modulation manner, the complexity is lower. In order to further improve the error rate of the visible light communication system, the method utilizes a channel balancer based on a feed-forward back propagation multilayer perceptron on a receiving end, so that the error rate is effectively improved, and the communication quality is further improved.

Description

technical field [0001] The invention belongs to the technical field of visible light wireless communication, and relates to a variable pulse amplitude position modulation and bit error rate improvement method for a visible light communication system. Background technique [0002] At present, due to the increasing depletion of network frequency band resources, network interference, and network leaks, we need to find new network communication technologies that can overcome the above problems, and visible light communication technology is one of the most promising technologies. [0003] Visible Light Communication (Visible Light Communication, VLC) technology is a new wireless optical communication method that uses visible light as an information carrier. dual function. The light emitted by visible light communication is the part of the electromagnetic spectrum that can be perceived by the human eye. The wavelength is between 380nm and 780nm, which is safe for human eyes. The...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L25/03H04B10/116
Inventor 陈前斌易利冀磊许娟雄冉启飞刘伊莎唐伦
Owner CHONGQING UNIV OF POSTS & TELECOMM
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