Next Article in Journal
Healable, Flexible Supercapacitors Based on Shape Memory Polymers
Next Article in Special Issue
A Survey on Robust Video Watermarking Algorithms for Copyright Protection
Previous Article in Journal
Early-Age Cracking in Concrete: Causes, Consequences, Remedial Measures, and Recommendations
Previous Article in Special Issue
Research on a Surface Defect Detection Algorithm Based on MobileNet-SSD
Open AccessArticle

Hiding Stealth Optical CDMA Signals in Public BPSK Channels for Optical Wireless Communication

1
Department of Electrical Engineering, National Formosa University, Yunlin County 632, Taiwan
2
Department of Electrical Engineering, National Cheng Kung University, Tainan City 701, Taiwan
3
Department of Photonics Engineering, National Cheng Kung University, Tainan City 701, Taiwan
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(10), 1731; https://doi.org/10.3390/app8101731
Received: 20 August 2018 / Revised: 19 September 2018 / Accepted: 20 September 2018 / Published: 25 September 2018
A new optical steganography scheme is proposed that transmits a stealth optical code-division multiple-access (OCDMA) signal through a public binary phase-shift keying (BPSK) channel. Polarization beam splitters and arrayed waveguide gratings are used to implement a spectral-polarization coding (SPC) system with an incoherent optical source. We employ a Walsh–Hadamard code as the signature code of the user who wants to transmit stealth information using the system. A free space optical link applied to this system maintains the polarization states of light during propagation. The secret data are extracted using correlation detection and balanced subtraction in the OCDMA decoder of the intended receiver, and the other signal from the public channel is reduced by the OCDMA decoder. At the demodulator of the public channel, BPSK demodulation eliminates the stealth signal so that the public channel is not affected by the stealth signal. The two signals cannot interfere with each other. The results of this study show that our proposed optical steganography system is highly secure. The stealth signal can be favorably hidden in the public channel when the average source power of the stealth signal, public noise, and public signal are −5, −3, and 0 dBm, respectively. View Full-Text
Keywords: optical steganography; optical code-division multiple-access (OCDMA); free space optics (FSO); chirped fiber Bragg grating (CFBG) optical steganography; optical code-division multiple-access (OCDMA); free space optics (FSO); chirped fiber Bragg grating (CFBG)
Show Figures

Figure 1

MDPI and ACS Style

Yen, C.-T.; Huang, J.-F.; Zhang, W.-Z. Hiding Stealth Optical CDMA Signals in Public BPSK Channels for Optical Wireless Communication. Appl. Sci. 2018, 8, 1731.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop