Open AccessSecure multiple access for indoor optical wireless communications with time-slot coding and chaotic phase
Author(s) -
Li Tian,
Ke Wang,
Christina Lim,
Elaine Wong,
Tingting Song,
Ampalavanapillai Nirmalathas
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.022046
Subject(s) - chaotic , computer science , coding (social sciences) , qam , wireless , transmission (telecommunications) , quadrature amplitude modulation , electronic engineering , phase shift keying , optical communication , optical wireless communications , optical wireless , telecommunications , computer network , bit error rate , channel (broadcasting) , mathematics , engineering , artificial intelligence , statistics
In this paper, we report a novel mechanism to simultaneously provide secure connections for multiple users in indoor optical wireless communication systems by employing the time-slot coding scheme together with chaotic phase sequence. The chaotic phase sequence is generated according to the logistic map and applied to each symbol to secure the transmission. Proof-of-concept experiments are carried out for multiple system capacities based on both 4-QAM and 16-QAM modulation formats, i.e. 1.25 Gb/s, 2 Gb/s and 2.5 Gb/s for 4-QAM, and 2.5 Gb/s, 3.33 Gb/s and 4 Gb/s for 16-QAM. Experimental results show that in all cases the added chaotic phase does not degrade the legitimate user's signal quality while the illegal user cannot detect the signal without the key.