Author
Yesilkaya, A., Basar, E., Miramirkhani, Farshad, Panayirci, E., Uysal, Murat
Publication Date
2017-08
Publication Place
-
IEEE
Subject
Visible light communications (VLC), Multiple-input-multiple-output (MIMO) systems, Orthogonal frequency division multiplexing (OFDM), Optical-spatial modulation (OSM), LED index modulation, Maximum-a-posteriori probability (MAP) estimator
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
0090-6778
Record ID
f0dc0051-48a6-41ae-b765-1f2801b373bf
Library Location
Electrical & Electronics Engineering
Date
2017-08
Notes
Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Sample Text
Visible light communications (VLC) is a promising and uncharted new technology for the next generation of wireless communication systems. This paper proposes a novel generalized light emitting diode (LED) index modulation method for multiple-input-multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM)-based VLC systems. The proposed scheme avoids the typical spectrum efficiency losses incurred by time- and frequency-domain shaping in OFDM signals. This is achieved by exploiting spatial multiplexing along with LED index modulation. Accordingly, real and imaginary components of the complex time-domain OFDM signals are separated first, then resulting bipolar signals are transmitted over a VLC channel by encoding sign information in LED indexes. As a benchmark, we demonstrate the performance analysis of our proposed system for both analytical and physical channel models. Furthermore, two novel receiver designs are proposed. Each one is suitable for frequency-flat or selective channel scenarios. It has been shown via extensive computer simulations that the proposed scheme achieves considerably better bit error ratio versus signal-to-noise-ratio performance than the existing VLC-MIMO-OFDM systems that use the same number of transmit and receive units [LEDs and photo diodes (PDs)]. Compared with the single-input single-output (SISO) DC biased optical (DCO)-OFDM system, both spectral efficiency and DC bias can be doubled and removed respectively simply by exploiting a MIMO configuration.
DOI
10.1109/TCOMM.2017.2699964
Cilt
65
