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Visible light communication modulation method based on carrier index modulation and implementation system thereof

A carrier index modulation and visible light communication technology, applied in the field of visible light communication, can solve the problems of reducing the bit error rate and high system complexity of the visible light communication system

Inactive Publication Date: 2018-09-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of high system complexity caused by the dual constellation diagram of the DM-DCO-OFDM modulation technology, the present invention proposes a visible light communication modulation method based on carrier index modulation, which reduces the complexity of the visible light communication system and further reduces the Bit Error Rate of Visible Light Communication System

Method used

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  • Visible light communication modulation method based on carrier index modulation and implementation system thereof
  • Visible light communication modulation method based on carrier index modulation and implementation system thereof
  • Visible light communication modulation method based on carrier index modulation and implementation system thereof

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Embodiment 1

[0073] A modulation method for visible light communication based on carrier index modulation, which uses one transmitting end and one receiving end to transmit one channel of data. In this embodiment, 128 subcarriers are used to transmit data, which are divided into G=32 groups, and each group is n = 4 carriers. In each group, l=2 carriers are selected to transmit the original complex signal. Constellation bit mapping is performed using M=2-order unipolar PAM, and the constellation symbol set S={1,3} includes:

[0074] (1) The signal bit stream and the total number of carriers N transmitted by the transmitter are divided into G=32 groups on average according to the sequence, and the number of carriers in each group is expressed as n=4;

[0075] (2) Select l=2 carriers from each group of carriers to transmit the original complex signal, and calculate the number of input bits m of each group; the calculation formula is shown in formula (I):

[0076]

[0077] (3) design look...

Embodiment 2

[0112] The implementation system of the visible light communication modulation method described in Embodiment 1 includes a sending end and a receiving end; the sending end includes a bit grouping module, a carrier index modulation module, an M-order unipolar PAM modulation module, an OFDM data generation module, and a Hermitian ( Hermitian) symmetry module, IFFT module, DC bias transmission module; the receiving end includes a photodetector, a DC removal module, an FFT module, a Hermitian (Hermitian) symmetry removal module, a zero-forcing detection module, and a bit recovery module.

[0113] like figure 1 As shown, the bit grouping module is used to: divide the bits to be sent into G groups in sequence; each group is input to the carrier index modulation module in sequence; the carrier index modulation module is used for carrier index, M-order unipolar PAM The modulation module is used for unipolar PAM mapping, and outputs complex signals that complete carrier index modulatio...

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Abstract

The invention relates to a visible light communication modulation method based on carrier index modulation and an implementation system thereof. The information bits to be transmitted are divided intotwo parts of index bits and constellation bits; the constellation bits are input into a unipolar M-order PAM constellation diagram to obtain a modulated constellation symbol; and then, every two constellation symbols form a complex signal. The index bits are used for selecting which sub-carriers to transmit the complex signal and which sub-carriers to transmit the conjugate signal of the complexsignal. After being subjected to discrete fourier inverse transform and direct-current offset, the complex signal modulated by the carrier index modulation can be converted into a unipolarity real signal. At a receiving end, the complex signal, obtained after the direct-current offset and the discrete fourier transform are removed, recovers the index bits according to the judgment of the symbol ofan imaginary part of the received signal. The received complex signal real part and imaginary part are respectively subjected to demapping of the M-order PAM constellation diagram to recover the transmission constellation bits.

Description

technical field [0001] The present invention relates to a modulation method of visible light communication based on carrier index modulation and its realization system, in particular to a modulation method suitable for visible light communication of carrier index modulation (IM) and orthogonal frequency division multiplexing (OFDM), which belongs to visible light communication technology field. Background technique [0002] With the commercial use of 4G communication technology and the rapid growth of mobile communication users, spectrum resources have become an important limiting factor for the development of communication technology. Because visible light communication has abundant spectrum resources that can be used without authorization, it has attracted extensive attention from researchers at home and abroad. Compared with traditional wireless communication, visible light communication can realize information transmission while lighting; visible light has no electromag...

Claims

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Application Information

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IPC IPC(8): H04L27/36H04B10/116
CPCH04B10/116H04L27/362
Inventor 张文胜李浩东徐加利范建国郭信山王承祥
Owner SHANDONG UNIV
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