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Inverse polarity multi-pulse position modulated light ofdm system combined with dimming control

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

Active Publication Date: 2021-04-06
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • 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) method is also proposed. Although it can provide relatively high spectral efficiency, the system complexity is relatively large, and it does not use digital Dimming technology

Method used

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  • Inverse polarity multi-pulse position modulated light ofdm system combined with dimming control
  • Inverse polarity multi-pulse position modulated light ofdm system combined with dimming control
  • Inverse polarity multi-pulse position modulated light ofdm system combined 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, including a transmitter and a receiver, the transmitter and 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 photodetector of the receiver through the VLC optic...

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Abstract

The present invention provides a reverse polarity multi-pulse position modulated optical OFDM system combined with dimming control. The system effectively combines MPPM and RPO-OFDM technologies. While supporting flexible dimming functions, it utilizes the The extra bits increase the data transmission rate while maintaining the same bandwidth. Compared with traditional RPO‑OFDM, this method can achieve higher spectral efficiency with similar computational complexity and energy consumption.

Description

technical field [0001] The invention relates to the field of wireless optical communication, in particular 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 the current cellular network standards are still evolving, the demand for mobile data traffic is likely to exceed the support that traditional spectrum can provide. The emergence of Visible Light Communication (VLC) can just solve the problem of increasingly tight spectrum resources. The basic device of the VLC is a light emitting diode (Light Emitting Diode, LED) 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 Multiplexing (OFDM) techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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