Indoor wireless light high-speed two-way communication system

A two-way communication, wireless optical technology, applied in the field of wireless optical communication, can solve problems such as no good solution, uplink and downlink interference, short propagation distance, etc. The effect of low consumption

Active Publication Date: 2013-10-23
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In general, for the uplink of indoor wireless communication, the main problems of the above technologies are: half-duplex mode, low communication speed, short propagation distance, poor security, interference between uplink and downl

Method used

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  • Indoor wireless light high-speed two-way communication system
  • Indoor wireless light high-speed two-way communication system
  • Indoor wireless light high-speed two-way communication system

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Embodiment

[0031] Example: by figure 1 It can be seen that the present invention is an indoor high-speed, two-way wireless optical communication system composed of uplink and downlink. In the downlink, the LED realizes data transmission while illuminating, and the visible light signal carrying the data is received by the visible light receiving unit of the user terminal; in the uplink, the user terminal sends the data to be sent through the laser sending unit , which is received by the laser receiving unit of the access point, thereby realizing duplex communication. In the present invention, the laser uplink solution in the 1550nm wave band is adopted, combined with the visible light high-speed downlink, to realize bidirectional communication without crosstalk, high speed and low cost.

[0032] figure 2 It is a structural diagram of the 1550nm laser communication uplink, which is mainly composed of three parts: laser transmitting unit, laser receiving unit and atmospheric channel. Am...

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Abstract

The invention belongs to the field of wireless optical communication, and particularly relates to an indoor wireless light high-speed two-way communication system which comprises a visible light down link and a 1550nm wave band laser up link. In the down link, data transmission is achieved when an LED illuminates. The 1550nm wave band laser up link is adopted and combined with the visible light down link, so high-speed full-duplex communication is achieved. The indoor wireless light high-speed two-way communication system has the advantages that a transmission speed of a Gbps order is easily achieved through a 1550nm wave band laser communication system and can be matched with high-speed downlink visible light communication to meet demands of high-speed data transmission in the future; InGaAs materials are adopted in a 1550nm wave band photoelectric detector, and differing from Si materials of a visible light reception detector in the spectral response range, the crosstalk problem and other problems of up links and downlinks are solved from a physical mechanism. Through the laser communication scheme of the up link, the indoor wireless light high-speed two-way communication can achieve seamless connection with an optical fiber communication system at present and has higher practical value.

Description

technical field [0001] The invention belongs to the field of wireless optical communication, in particular to an indoor wireless optical high-speed two-way communication system. Background technique [0002] In recent years, semiconductor light-emitting diode (Light Emitting Diode, LED) lighting technology, known as "green lighting", has developed rapidly. Compared with traditional lighting sources, LED has the advantages of low power consumption, long life, small size, and environmental protection. It is considered that it will eventually replace traditional lighting sources such as fluorescent lamps and incandescent lamps, and become the next generation of solid-state lighting sources. At the same time, LED has the characteristics of short response time, high response sensitivity, and high modulation bandwidth. Therefore, the signal can be modulated to the light beam of the LED for transmission, realizing the dual functions of lighting and communication. Visible light com...

Claims

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Application Information

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IPC IPC(8): H04B10/114H04B10/116H04J14/02
Inventor 刘璐涂波陈特胡薇薇
Owner PEKING UNIV
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