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Organic visible light communication system and adaptive nonlinear equalizer based on Volterra series

A visible light communication and nonlinear technology, applied in the field of visible light communication, can solve the problem of nonlinear distortion without considering the memory effect, and achieve the effects of increasing communication distance, suppressing nonlinear distortion, and improving effective SNR.

Inactive Publication Date: 2017-11-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology is only aimed at the improvement of the transmission rate, and does not consider the nonlinear distortion of this memory effect

Method used

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  • Organic visible light communication system and adaptive nonlinear equalizer based on Volterra series
  • Organic visible light communication system and adaptive nonlinear equalizer based on Volterra series
  • Organic visible light communication system and adaptive nonlinear equalizer based on Volterra series

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Embodiment 1

[0055] An embodiment of the present invention provides an organic visible light communication system, such as figure 1 As shown, it mainly includes: a white organic light-emitting diode (OLED) arranged at the sending end, an optical lens (lens) arranged at the receiving end and connected in sequence, a photodetector, and an adaptive sensor based on the Volterra (Volterra) series Nonlinear equalizer (Volterra DFE); the white light organic light-emitting diode is used as a light source, the optical lens and photodetector perform photoelectric signal conversion on the received optical signal, and output the electrical signal to an adaptive nonlinear equalizer based on Volterra series The adaptive nonlinear equalizer based on the Volterra series is used to suppress the nonlinear distortion of the white organic light-emitting diode with memory effect, improve the effective SNR of the electrical signal, increase the communication distance, thereby improving the overall performance of...

Embodiment 2

[0088] An embodiment of the present invention also provides an adaptive nonlinear equalizer based on Volterra series, which is applied to an organic visible light communication system, and includes two simplified models;

[0089] One of the simplified models is a memory polynomial model expressed as:

[0090]

[0091] where x k (n-q) represents the corresponding item with a memory depth of q and a nonlinear order of k, w kq Its corresponding coefficient;

[0092] Another simplified model considers the 2nd-order nonlinear distortion, as well as the nonlinear distortion of the adjacent input, expressed as:

[0093]

[0094] Among them, K is the order of nonlinearity, Q is the maximum memory depth, x(n) is the electrical signal at the receiving end at time n, is the original input signal estimated from the Volterra series expansion, w q is the coefficient of the linear term corresponding to the memory depth, w ql ,w QQ is the coefficient of the nonlinear term corresp...

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Abstract

The invention discloses an organic visible light communication system and an adaptive nonlinear equalizer based on Volterra series. The organic visible light communication system comprises a white light OLED arranged on a sending end, and an optical lens, a photoelectric detector and the adaptive nonlinear equalizer based on Volterra series, which are arranged on a receiving end and are connected in sequence; the white light OLED is used as a light source, the optical lens and the photoelectric detector perform photoelectric signal conversion on a received optical signal and output an electric signal to the adaptive nonlinear equalizer based on Volterra series; and the adaptive nonlinear equalizer based on Volterra series is used for inhibiting the nonlinear distortion of the white light OLED having a memory effect and improving the effective SNR of the electric signal. The scheme can inhibit the nonlinear distortion of the organic visible light communication system to a certain extent, so that the effective SNR can be effectively improved, the transmission distance is increased while satisfying a certain error rate threshold, and thus the overall performance of the organic visible light communication system is improved.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, in particular to an organic visible light communication system and an adaptive nonlinear equalizer based on Volterra series. Background technique [0002] Visible light communication (VLC) technology, as a new type of wireless communication method, uses the modulation of the luminous intensity of light-emitting diodes (LEDs), so that LEDs can simultaneously realize the functions of lighting and communication, and uses photodetectors as the receiving end. Compared with traditional wireless radio frequency communication, visible light communication has the advantages of extremely wide spectrum, no need for radio spectrum certification, good confidentiality, and environmental protection. At the same time, as a new type of lighting source, organic light emitting diode (OLED) has the characteristics of bendability, transparency, long life and high color rendering index, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/69
CPCH04B10/116H04B10/697H04B10/6971
Inventor 徐正元李翔宇陈涵洁高谦龚晨李上宾
Owner UNIV OF SCI & TECH OF CHINA
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