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Wireless Communications and Mobile Computing
Volume 2017 (2017), Article ID 4094096, 6 pages
Research Article

Secrecy Dimming Capacity in Multi-LED PAM-Based Visible Light Communications

Department of ICT Automotive Engineering, Hoseo University, 201 Sandan 7-ro, Seongmun-myeon, Dangjin-si, Chungcheongnam-do 31702, Republic of Korea

Correspondence should be addressed to Byung Wook Kim

Received 8 June 2017; Accepted 31 July 2017; Published 28 August 2017

Academic Editor: Shingo Yamaguchi

Copyright © 2017 Byung Wook Kim. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Recently, mobile cloud computing (MCC) has gained a lot of interest for researchers building the next-generation mobile applications. Because unauthorized access may cause serious problems, security and privacy with MCC have become significant issues. This paper addresses the secrecy dimming capacity of secure transmission in MCC over visible light communication (VLC) channels. By obtaining the entropy-maximizing symbol probability of multiple light emitting diode- (LED-) based pulse amplitude modulation (PAM), mathematical analysis of the secrecy dimming capacity of VLC was derived. Simulation results show that the secure transmission ability of multi-LED-based VLC is determined according to the number of activated LEDs and target dimming level. This can be a guideline for practical VLC-based mobile network designers intending to secure wireless transmission and to decide on the number of activated LEDs at target dimming level to operate.