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Optical orthogonal frequency division multiplexing symbol decomposition serial transmission method with optimal signal-to-noise ratio

A technology of symbol decomposition and orthogonal frequency division, which is applied in the transmission system, transmission monitoring, free space transmission, etc., can solve the problems of BER performance deterioration, large number of symbol decompositions, and communication rate reduction, etc., to reduce clipping distortion , reduce background noise, improve the effect of bit error rate performance

Pending Publication Date: 2021-12-10
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, when the variance of the O-OFDM symbol is small, completely decomposing the O-OFDM symbol may require a large number of symbol decompositions, resulting in poor BER performance of the O-OFDM system, loss of optical power, and reduced communication rate.

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  • Optical orthogonal frequency division multiplexing symbol decomposition serial transmission method with optimal signal-to-noise ratio
  • Optical orthogonal frequency division multiplexing symbol decomposition serial transmission method with optimal signal-to-noise ratio
  • Optical orthogonal frequency division multiplexing symbol decomposition serial transmission method with optimal signal-to-noise ratio

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Embodiment Construction

[0039] In SDST and ASDST systems, the receiving end needs to combine multiple decomposed symbols of serial framing into one recovered O-OFDM symbol. Since multiple decomposed symbols of serial framing are transmitted sequentially in the optical wireless channel, they are superimposed Additive white Gaussian noise (AWGN), so the more symbols are decomposed, the greater the AWGN noise introduced when the symbols are combined. On the other hand, the greater the number of symbol decompositions, the smaller the nonlinear distortion. Combining the above two aspects, there is an optimal symbol decomposition number, which minimizes nonlinear distortion and AWGN noise, and optimizes the signal-to-noise ratio (SNR) of the O-OFDM system. In short, different from the SDST and ASDST systems that pursue the goal of fully decomposing symbols, which may introduce greater AWGN noise, the OSNR-SDST of the present invention is based on the principle of optimizing SNR, which can further reduce th...

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Abstract

The invention relates to an optical orthogonal frequency division multiplexing symbol decomposition serial transmission method with an optimal signal-to-noise ratio, which mainly comprises the following steps of: (1) mapping modulation symbols, and outputting Hermite symmetric vectors; (2) in order to regulate and control the O-OFDM symbol variance, carrying out pre-scale transformation on the mapping signal; (3) optimizing the signal-to-noise ratio after inverse Fourier transform to determine the optimal symbol decomposition times: presetting the maximum symbol decomposition frequency, respectively calculating the signal-to-noise ratio whensymbol decomposition is carried out once, symbol decomposition is carried out twice andthe symbol decomposition frequency is maximum, and selecting the decomposition frequency when the signal-to-noise ratio is optimal as the optimal symbol decomposition frequency; (4) decomposing the O-OFDM symbols: according to the amplitude limiting threshold and the optimal symbol decomposition frequency, repeatedly limiting the amplitude of the O-OFDM symbols; (5) enabling the decomposed symbols to be sequentially and serially framed, and inserting frame headers; (6) after photoelectric conversion, removing a frame header, splitting a frame, deleting CP, respectively delaying to time alignment, and performing combining to obtain an O-OFDM symbol; and (7) extracting useful information after Fourier transform, and demodulating and recovering an original signal.

Description

technical field [0001] The invention relates to a technology for suppressing non-linear distortion of an optical orthogonal frequency division multiplexing LED in visible light communication, in particular to a method for suppressing nonlinear distortion of an LED through symbol decomposition and serial transmission of optical orthogonal frequency division multiplexing in visible light communication. Background technique [0002] Visible light communication (VLC) uses visible light emitted by ordinary light-emitting diodes (LEDs) as a carrier, and can provide short-distance, ultra-broadband, and cable-free information transmission. It is an ideal complementary technology to traditional radio frequency communication. LED has the advantages of high lighting efficiency, energy saving and environmental protection, higher modulation bandwidth, etc., and it is the general trend to become the main light source of next-generation lighting. With the popularization and use of LEDs, VL...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/54H04B17/336H04L5/00H04L27/26
CPCH04B10/116H04B10/541H04B17/336H04L5/0007H04L27/26035H04L27/2607H04L27/2698Y02D30/70
Inventor 贾科军杨博然蔺莹彭铎秦翠翠
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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