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SC-FDMA-based visible light communication system

A technology of SC-FDMA and visible light communication, applied in the field of visible light communication, to achieve the effect of improving wireless communication rate and spectrum utilization, overcoming errors and delays, and avoiding nonlinear distortion

Inactive Publication Date: 2017-08-15
JIANGSU UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to solve the problem of multiple access in the uplink of the visible light communication system, so that multiple users correspond to a receiving end, and each user allocates different subcarriers for separate modulation, and finally superimposes on the optical path

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Embodiment Construction

[0028] In order to make the technical solutions of the present invention clearer and clearer to those skilled in the art, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0029] Such as figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, a visible light communication system based on SC-FDMA provided in this embodiment includes a modulator 1, a transmitting terminal 2, a receiving terminal 3 and a demodulator 4, and the transmitting terminal 2 is composed of a transmitting drive circuit 21 and an LED 22 , the receiving end 3 is composed of a post-stage amplifying circuit 31, a basic amplifying circuit 32 and a photoelectric tube 33, the photoelectric tube 33 is used to convert the received optical signal into an electrical signal, and the basic amplifying circuit 32 is used to amplify The photoelectr...

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Abstract

The invention discloses an SC-FDMA-based visible light communication system, and belongs to the technical field of visible light communication. The SC-FDMA-based visible light communication system comprises a modulator, a transmitting end, a receiving end and a demodulator; the transmitting end is composed of a transmission driving circuit and an LED; the receiving end is composed of a post-amplification circuit, a basic amplification circuit and a photoelectric tube; the photoelectric tube is used for converting received optical signals into electric signals; the basic amplification circuit is used for amplifying weak signals after the photoelectric tube converts the optical signals into the electric signals; and the post-amplification circuit is composed of a program control amplification circuit, an automatic gain control AGC circuit and a manual adjustment combined feedback circuit. By means of the SC-FDMA-based visible light communication system disclosed by the invention, the uplink multiple access problem of the visible light communication system can be solved; therefore, multiple users correspond to one receiving end; and each user distributes different sub-carriers to perform individual modulation, and finally to be superposed on a light path.

Description

technical field [0001] The present invention relates to a visible light communication system, in particular to a visible light communication system based on SC-FDMA, and belongs to the technical field of visible light communication. Background technique [0002] In the uplink, multi-user data transmission mostly adopts multiple access technology, which mainly includes TDMA, CDMA, and FDMA. Because of the disadvantages of delay, increased complexity, and reduced frequency band utilization, OFDMA technology is considered. , and OFDMA will generate high PAPR in the transmission process, so it is not suitable for visible light communication. Introducing SC-FDMA technology into visible light communication can not only effectively reduce the high PAPR in OFDM visible light communication system, but also solve the problem of visible light multiple access However, there is no visible light transmission system specifically used for SC-FDMA signals, and most of them are still in the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04L5/00H04L27/38
CPCH04B10/116H04L5/0007H04L27/3809
Inventor 贾子彦陈星宇俞洋陶为戈钟楠吴琳照黄成宋伟董世樑
Owner JIANGSU UNIV OF TECH
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