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Paper Abstract and Keywords
Presentation 2014-11-07 09:45
Layered Space-Time Coding Using LED Array for Image-Sensor-Based Visible Light Communications
Kastunori Ebihara, Koji Kamakura (CIT), Takaya Yamazato (Nagoya Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) This paper demonstrates the feasibility of layered space-time coding
(STC) in an outdoor image-sensor-based (IS-based) visible light
communication (VLC) system. We examined that for low-resolution
IS-based VLC channel where intensity modulated signals from two
different light emitting diodes (LEDs) are detected at one pixel on
the image plane, STC allows to decouple them, thus receiving data with
no errors. Consequently, STC offers extending the transmission
distance. In the layered STC presented here, additional bit streams
are aligned in the ${2^ntimes 2^n}$,LED array for
increasing the transmission rate per symbol duration for the case
where the spatial resolution is improved. A prototype of three
layered STC is built with an ${8times 8}$,LED array.
Our experimental results validate that
additional bit streams (layer-2 and -3), aligned in the layer-1 STC
matrix pair, are extracted with no errors when the receiver comes
within 155,m and 55,m, respectively, from the LED array, without
decreasing 210,m of the transmission distance of layer-1 bit stream.
Keyword (in Japanese) (See Japanese page) 
(in English) Visible light communications / Free-space optical systems / Optical wireless communications / LED traffic lights / Space-time coding (STC) / Intelligent transport system (ITS) / Image sensor communication /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 289, CS2014-67, pp. 81-86, Nov. 2014.
Paper # CS2014-67 
Date of Issue 2014-10-30 (CS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
Notes on Review This article is a technical report without peer review, and its polished version will be published elsewhere.

Conference Information
Committee CS  
Conference Date 2014-11-06 - 2014-11-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Shiretoko (Hokkaido) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Broadband Access Systems, Home Networks, Network Services, Applications for Communications, etc. 
Paper Information
Registration To CS 
Conference Code 2014-11-CS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Layered Space-Time Coding Using LED Array for Image-Sensor-Based Visible Light Communications 
Sub Title (in English)  
Keyword(1) Visible light communications  
Keyword(2) Free-space optical systems  
Keyword(3) Optical wireless communications  
Keyword(4) LED traffic lights  
Keyword(5) Space-time coding (STC)  
Keyword(6) Intelligent transport system (ITS)  
Keyword(7) Image sensor communication  
1st Author's Name Kastunori Ebihara  
1st Author's Affiliation Chiba Institute of Technology (CIT)
2nd Author's Name Koji Kamakura  
2nd Author's Affiliation Chiba Institute of Technology (CIT)
3rd Author's Name Takaya Yamazato  
3rd Author's Affiliation Nagoya University (Nagoya Univ.)
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Date Time 2014-11-07 09:45:00 
Presentation Time 15 
Registration for CS 
Paper # IEICE-CS2014-67 
Volume (vol) IEICE-114 
Number (no) no.289 
Page pp.81-86 
#Pages IEICE-6 
Date of Issue IEICE-CS-2014-10-30 

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