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M-Point Combinatory for Parallel Transmission Image Sensor-Based Visible Light Communications

M -point combinatory (MC) modulation is proposed for parallel transmission (PT) image sensor (IS)-based visible light communication (VLC). In the conventional PT system, M0 discrete signals which incorporate N=(M0−1)/2 spatial frequencies are transmitted in parallel with M0 transmitting regions of liquid crystal display (LCD). When each of spatial frequencies is modulated with P -ary phase shift keying ( P -PSK), the number of bits transmitted in one frame is given by k=Nlog2P bits. k increases when the number of spatial frequencies N increases with M0 , but at the same time, the peak-to-average power ratio (PAPR) becomes high because the signal of the PT system is essentially orthogonal frequency modulation, thus remaining at a very low number of spatial frequencies N that the system accommodates without any error. In this paper, we propose MC modulation, which is combined with the PT system to increase the number of bits per frame that the system carries without any error. In the MC PT system, M out of the M0 transmitting regions are used for transmitting M discrete signals related to M -point DFT, where M≤M0 . Since there are (M0M) ways in choosing M out of the M0 ones, we map them to ℓ=⌊log2(M0M)⌋ bits. In addition k bits, the total number of bits per frame is k+ℓ bits. According to ℓ bits, M transmitting regions are chosen for a frame, and then the M chosen ones are used to transmit M discrete signals of the PT system which carries k bits. Our experimental results show that our proposed MC PT system with 8-PSK achieves 697 bits per frame with keeping no error being observed, while the conventional PT system does only 180 bits per frame.

Ketersediaan

Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.41 No.2 January 15 2023

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 515-523

Bahasa

English

ISBN/ISSN

-

Klasifikasi

NONE

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

OPTICAL WIRELESS COMMUNICATIONS
VISIBLE LIGHT COMMUNICATIONS
SPATIAL PARALLEL TRANSMISSION
SPATIAL OFDM
IMAGE SENSOR COMMUNICATIONS
PARALLEL COMBINATORY

Info Detail Spesifik

DOI: 10.1109/JLT.2022.3218071

Pernyataan Tanggungjawab

Takumi Sato, Koji Kamakura, Masayuki Kinoshita, Takaya Yamazato

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