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A method and system for papr suppression of dco-ofdm system based on autoencoder

An autoencoder and autoencoder technology, applied in the field of autoencoder-based DCO-OFDM system PAPR suppression, can solve the problems of data rate reduction, sacrifice of computational complexity and channel resources, poor bit error rate performance, etc. Achieve good bit error rate performance, reduce PAPR, and reduce the effect of bit error rate

Active Publication Date: 2021-06-01
SHANDONG JIANZHU UNIV
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Problems solved by technology

However, these methods sacrifice computational complexity and channel resources or lead to a reduction in data rate while reducing PAPR.
Furthermore, subcarrier grouping schemes proposed for OFDM-based VLC systems to reduce PAPR have poor bit error rate (BER) performance at low SNR

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  • A method and system for papr suppression of dco-ofdm system based on autoencoder

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[0046]It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0047] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0048] Terminology Explanation Section:

[0049] PAPR: peak-to-average power ratio;

[0050] Autoencoder: self-encoder;

[00...

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Abstract

The present disclosure proposes a DCO-OFDM system PAPR suppression method and system based on an autoencoder, which converts the input signal into serial and parallel and transmits it to the encoder part of the self-encoder network to obtain the I-Q constellation mapping output; and then transmits to the phase rotator to generate an alternative low PAPR output sequence; the alternative output sequence is Hermitian symmetric and inverse fast Fourier transformed to obtain a time-domain OFDM signal; after the time-domain OFDM signal is converted to parallel and adds a cyclic prefix, it is added by DC bias and clipping, convert the output of the inverse fast Fourier transform into a unipolar output, and make the OFDM signal suitable for the limited emission range of the LED; after channel transmission, the receiving end passes through the fast Fourier transform, the signal The phase recovery and decoder modules recover the distorted signal. This scheme combines the autoencoder and the extended SLM method, which can significantly reduce the PAPR of the DCO-OFDM system by more than 10dB. Compared with the SLM and Clipping methods, it has better bit error rate performance and has a strong effect on intersymbol interference. robustness.

Description

technical field [0001] The present disclosure relates to the technical field of optical wireless communication, in particular to a PAPR suppression method and system for a DCO-OFDM system based on an autoencoder. Background technique [0002] Visible light communication (VLC) based on light-emitting diodes is a promising indoor wireless access technology. In order to overcome the multipath distortion caused by the reflection of different indoor light sources and improve the communication efficiency, the VLC system widely adopts Optical Orthogonal Frequency Division Multiplexing (OFDM) technology. However, the peak-to-average power ratio (PAPR) is one of the main limiting factors of the VLC system due to the limitation of the average radiated optical power and the dynamic range of the front-end equipment. The high peak power ratio makes the VLC system more susceptible to nonlinear distortion, which greatly degrades the system's performance. Two types of VLC-OFDM techniques,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B10/116
CPCH04B10/116H04L27/2614H04L27/2615
Inventor 郝丽丽马安凡许福运张运楚李成栋
Owner SHANDONG JIANZHU UNIV
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