Bandwidth efficiency improvement of optical wireless link based on yellow phosphor coated light emitting diode using non‐orthogonal frequency shift keying. Issue 6 (30th March 2017)

• Record Type: Journal Article
• Authors: Won, Yong‐Yuk; Yoon, Sang Min; Seo, Dongsun
• Is Part Of: Microwave and optical technology letters. Volume 59:Issue 6(2017:Jun.)
• Page Start: 1371
• Page End: 1375
• Publication Date: 2017-03-30
• Subjects: bandwidth efficiency -- phosphor coated light emitting diode -- non‐orthogonal frequency shift keying; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.30548
• Languages: English
• ISSNs: 0895-2477

Abstract

ABSTRACT: A non‐orthogonal frequency shift keying (NOFSK) modulation technique, which increases the bandwidth efficiency of an optical wireless link based on a yellow phosphor coated‐light emitting diode (ypc‐LED), is proposed in this article. A 4‐NOFSK signal is transmitted using an optical wireless link based on the ypc‐LED. One more bit per symbol are transmitted successfully showing the only 3% increase of 2‐MHz physical bandwidth at the bit error rate (BER) below 10 −5 . It is implied that the bandwidth efficiency is increased twice as much as ypc‐LED modulated by off keying (OOK) signal. Furthermore, there was no ICI effect at the frequency spacing of 2 kHz (0.1% of 2‐MHz physical bandwidth), which corresponds to 0.1% of the symbol rate of 2 Msymbols/s. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1371–1375, 2017