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ADO (Asymmetrically Clipped DC Biased Optical)-OFDM (Orthogonal Frequency Division Multiplexing) system PAPR (Peak to Average Power Ratio) inhibition method based on SLM (Selected Mapping) and CT (Companding Transform)

An ADO-OFDM, peak-to-average ratio suppression technology, applied in the field of ADO-OFDM system peak-to-average ratio suppression, can solve problems such as inter-symbol interference and suppression of system information transmission rate

Inactive Publication Date: 2016-10-26
HARBIN ENG UNIV
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Problems solved by technology

A large number of scattering elements in the air will cause optical signals to reach the receiving end along different transmission paths, multipath transmission will cause inter-symbol interference, and inter-symbol interference will seriously inhibit the information transmission rate of the system

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  • ADO (Asymmetrically Clipped DC Biased Optical)-OFDM (Orthogonal Frequency Division Multiplexing) system PAPR (Peak to Average Power Ratio) inhibition method based on SLM (Selected Mapping) and CT (Companding Transform)
  • ADO (Asymmetrically Clipped DC Biased Optical)-OFDM (Orthogonal Frequency Division Multiplexing) system PAPR (Peak to Average Power Ratio) inhibition method based on SLM (Selected Mapping) and CT (Companding Transform)
  • ADO (Asymmetrically Clipped DC Biased Optical)-OFDM (Orthogonal Frequency Division Multiplexing) system PAPR (Peak to Average Power Ratio) inhibition method based on SLM (Selected Mapping) and CT (Companding Transform)

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[0023] The implementation of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0024] The present invention proposes a method for reducing system peak-to-average ratio based on Selected Mapping (SLM) and Companding Transform (CT). In some specific environments, it is required that the asymmetrically limited DC bias optical OFDM communication system has a lower PAPR. However, it is difficult to achieve the required reduction effect by using only one algorithm, so it can be dealt with in the form of a combination of multiple methods. This patent adopts selective mapping and companding transformation methods that are complementary in performance to combine, and uses the serial method as the combined method of the algorithm. According to the structural characteristics of the asymmetric clipped DC bias optical OFDM communication system, a selective mapping algorithm is embedded in the ACO-OFDM and DCO-OFDM signal generation...

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Abstract

The invention belongs to the field of optical wireless communication, and particularly relates to an ADO (Asymmetrically Clipped DC Biased Optical)-OFDM (Orthogonal Frequency Division Multiplexing) system PAPR (Peak to Average Power Ratio) inhibition method based on SLM (Selected Mapping) and CT (Companding Transform) for inhibiting a relatively high PAPR in an ADO-OFDM communication system. The method comprises the following steps: at a sending end, carrying out serial-to-parallel conversion and mapping on an input information sequence, and enabling a generated information vector X to have a Hermitian symmetry; and dividing the information vector X into an odd subcarrier vector Xodd and an even subcarrier vector Xeven, and respectively sending to ACO-OFDM and DCO-OFDM signal generating modules, etc. According to the method disclosed by the invention, a probability technology and a predistortion technology are combined, namely, an SLM technology is adopted on an ACO-OFDM signal branch and a DCO-OFDM signal branch, and a CT transform technology is adopted by a synthesized signal. And therefore, the scheme effectively inhibits the PAPR (Peak to Average Power Ratio) in the ADO-OFDM communication system.

Description

technical field [0001] The invention belongs to the field of optical wireless communication, and in particular relates to a method for suppressing a high peak-to-average ratio in an asymmetrically clipped DC biased optical OFDM (asymmetrically clipped DC biased optical OFDM, ADO-OFDM) communication system based on selective mapping and voltage reduction. The peak-to-average ratio suppression method of ADO-OFDM system based on spread transformation. Background technique [0002] Optical wireless communication has the characteristics of strong security and confidentiality, strong anti-interference, large communication capacity, no need for frequency licenses, and rapid deployment. It has good application prospects in military and civilian applications. However, the transmission of light in the atmosphere is a very complex process, which includes the scattering and absorption of atmospheric molecules, the scattering and absorption of suspended particles in the air, and atmosphe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 王勇宫妍
Owner HARBIN ENG UNIV
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