Reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control

A dimming control and multi-pulse technology, which is applied in the field of wireless optical communication, can solve the problems of inability to carry information and large system complexity, achieve high spectral efficiency and improve the data transmission rate.

Active Publication Date: 2018-08-03
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the PWM used for dimming in this method does not carry information
In the prior art, an asymmetric hybrid optical OFDM (Asymmetric Hybrid Optical OFDM, AHO-OFDM) met

Method used

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  • Reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control
  • Reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control
  • Reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control

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Embodiment 1

[0034] Such as figure 1 As shown, a reverse polarity multi-pulse position modulated optical OFDM system combined with dimming control includes a transmitter and a receiver, the transmitter and the receiver are connected through a VLC optical channel, and the transmitter includes sequentially connected data distribution device, an optical OFDM modulator, a first polarity inverter, a truncation device, a digital-to-analog converter, and an LED, and the data distributor is also connected to the first polarity inverter via an MPPM mode selector; the receiver comprising a photodetector connected in sequence, an analog-to-digital converter, a second polarity inverter, an optical OFDM demodulator and a data combiner, the analog-to-digital converter is also connected to the data combiner via an MPPM demodulator, The MPPM demodulator is also connected with the second polarity inverter; the optical signal of the LED is transmitted to the photodiode through the VLC optical channel.

[0...

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Abstract

The invention provides a reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control. The system combines MPPM and RPO-OFDM technologies efficiently, and improves the data transmission rate under the precondition of keeping a bandwidth unchanged by utilizing an extra-bit carried by an MPPM mode while supporting a flexible dimming function. Compared withthe traditional RPO-OFDM, the method can realize higher spectrum efficiency under the condition that calculation complexity and energy consumption are similar to those in the prior art.

Description

technical field [0001] The present invention relates to the field of wireless optical communication, more specifically, relates to a reverse polarity multi-pulse position modulated optical OFDM system combined with dimming control. Background technique [0002] In the 21st century, the demand for wireless data transmission rate is increasing exponentially. Although current cellular network standards are still evolving, the demand for mobile data traffic will most likely exceed what traditional spectrum can support. The emergence of visible light communication (Visible Light Communication, VLC) can just solve the problem of increasingly tight spectrum resources. The basic device of VLC is Light Emitting Diode (LED), which is widely used in lighting. VLC has many advantages, including no need for spectrum authorization, no radio frequency interference, and no radiation. [0003] As a key technology in the Long-Term Evolution (LTE) system, Orthogonal Frequency Division Multi...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B10/69H04B10/524H04B10/116
CPCH04B10/116H04B10/524H04B10/691H04L27/2601H04L27/2627H04L27/2649
Inventor 江明杨子贤张琳
Owner SYSU CMU SHUNDE INT JOINT RES INST
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