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Implementation method of DCO-OFDM visible light communication transmission system

A technology for visible light communication and transmission systems, applied in transmission systems, digital transmission systems, multi-frequency code systems, etc., can solve difficult and complex problems, achieve low complexity, easy implementation, and improve BER performance.

Active Publication Date: 2017-11-24
白盒子(上海)微电子科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The complexity of these systems is relatively high, and it is difficult to solve, especially for the receiving end

Method used

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  • Implementation method of DCO-OFDM visible light communication transmission system
  • Implementation method of DCO-OFDM visible light communication transmission system
  • Implementation method of DCO-OFDM visible light communication transmission system

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Embodiment Construction

[0033] 1. Technical issues

[0034] The scenario of this embodiment is as follows, such as figure 1 As shown, in the DCO-OFDM system model, x(n) is converted into x after DC bias and limiting t (n), the form of signal conversion adopts the method of piecewise function, in which the slope is adaptive, and the specific x t (n) The functional form is expressed as

[0035]

[0036] where a 1 and a 2 is the slope of the two changes, and b' is the DC point. The parameter b' is used to control x t (n) optical power, while the parameter a 1 and a 2 Can be used to reduce clipping distortion. The signal conversion diagram is as follows figure 2 shown.

[0037] x t The expected value of (n) needs to meet the optical power limit

[0038]

[0039] Where η is the required optical power, p(·) represents the probability density function (PDF) of a standard Gaussian random variable, and σ is the standard deviation of the time-domain OFDM signal.

[0040] At the receiving en...

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Abstract

The invention discloses an implementation method of a DCO-OFDM visible light communication transmission system. A slope in a signal conversion form function and an optimal value of a DC point parameter are given through solving an optimization problem on the basis of adopting a DCO-OFDM system novel transmission scheme, and then a transmission system is built based on the optimal value. Initial points and initial penalty factors of all the variables are given, then a linear restriction problem is solved, a maximum value point is obtained by utilizing the steepest descent method, and the optimal value of the optimization problem is finally obtained after multiple iterative calculations. Compared with the prior art, the implementation method of a DCO-OFDM visible light communication transmission system has better theoretical integrity and provides a realization scheme with relatively low complexity.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, in particular to a method for realizing a DCO-OFDM visible light communication transmission system. Background technique [0002] Because the visible light communication system uses intensity modulation and can only transmit real non-negative signals, the traditional OFDM needs to be adjusted before it can be applied to the visible light communication system. In the visible light communication system, the optical orthogonal frequency division multiplexing (O-OFDM) scheme has a high transmission rate and cost-effective equalization, so it has become a good modulation scheme in the high-speed communication of visible light communication. Many optical OFDM schemes have been proposed, such as DC bias optical orthogonal frequency division multiplexing (DCO-OFDM) and asymmetrically limited optical orthogonal frequency division multiplexing (ACO-OFDM). [0003] The DCO-OFDM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04L27/26
CPCH04B10/116H04L27/2602
Inventor 陈明韩晓青管瑞
Owner 白盒子(上海)微电子科技有限公司