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A hybrid peak-to-average ratio suppression method in dco-ofdm system

A peak-to-average ratio suppression and hybrid technology, which is applied in the communication field, can solve problems such as not considering the nonlinear characteristics of LED devices, and achieve the effect of reducing the peak-to-average ratio of the system, simple implementation, and low complexity

Active Publication Date: 2020-12-22
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0004] What the present invention aims to solve is that under the DCO-OFDM system, the existing peak-to-average ratio suppression method does not consider the nonlinear characteristics of LED devices, which affects the communication performance of the system. It provides a hybrid peak-to-average ratio in the DCO-OFDM system. ratio suppression method

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  • A hybrid peak-to-average ratio suppression method in dco-ofdm system
  • A hybrid peak-to-average ratio suppression method in dco-ofdm system
  • A hybrid peak-to-average ratio suppression method in dco-ofdm system

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific examples and with reference to the accompanying drawings.

[0036] see figure 1 , a hybrid peak-to-average ratio suppression method in a DCO-OFDM system, which specifically includes the following steps:

[0037] Step 1. After serial-to-parallel conversion and QAM modulation of the source data, N rows and M columns of frequency domain signal X are obtained. 1 . The number of parallel transmission paths is N, and the number of symbols to be transmitted is M.

[0038] In this embodiment, it is assumed that the number of parallel transmission paths is 63, the number of symbols to be transmitted is 100, and the number of IFFT transformation points is L=2(N+1). After serial-to-parallel conversion and 16QAM modulation of the source data, 63 lines are obtained. 100 columns of frequency do...

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Abstract

The invention discloses a hybrid peak-to-average ratio suppression method in a DCO-OFDM system, which combines non-linear characteristics of an LED to carry out DCT transform on a frequency domain signal so as to change the signal envelope range and then performs adaptive scaling on a time domain signal by combining the dynamic range of the LED, thereby greatly reducing the peak-to-average ratio of the system, and reducing the bit error rate of the system. In addition, the method disclosed by the invention further has the characteristics of simple implementation and low complexity.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a hybrid peak-to-average ratio suppression method in a DCO-OFDM (direct current biased optical orthogonal frequency division multiplexing) system. Background technique [0002] As a special multi-carrier modulation technology, Orthogonal Frequency Division Multiplexing (OFDM) has the advantages of high spectrum efficiency and strong anti-multipath interference ability, and has been widely used in visible light communication systems. The visible light OFDM system adopts the modulation method of intensity modulation / direct detection (IM / DD), so the baseband OFDM signal must be a real signal and satisfy non-negativity. Among them, the DC bias optical orthogonal frequency division multiplexing (DCO-OFDM) system achieves the conversion from bipolar to unipolar by adding a DC bias and cutting off the part of the signal that is still less than zero, and its implementation is simpl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B10/116H04B10/516
CPCH04B10/116H04B10/516H04L27/2614H04L27/2697
Inventor 李燕龙符杰林仇洪冰徐凌燕李晓记郑霖苏浩明陈雅迪陈晓
Owner GUILIN UNIV OF ELECTRONIC TECH