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In this paper, we consider the design of a network-coded cooperation (NetCC) transmission scheme for free-space optical (FSO) two-way relay networks (TWRN). The achieved network-coded spatial diversity gain can effectively enhance the FSO communication quality over strong turbulence channels. Different from traditional assumption of perfect channel state information (CSI) prior known at destination,...
This paper presents a wavelength division multiplexing/spectral amplitude coding system with optical code-division multiple-access, for applications using fiber vibration sensors. The device makes use of fiber Bragg grating (FBG) etching on optical fibers to provide encoding/decoding functionality. According to the orthogonal properties of spectral amplitude coding (SAC) using m-sequence code, the...
This paper proposes a fragile watermarking algorithm named compression watermarking algorithm (CWA) which provides compression and authentication functions to apply in MJPEG of video surveillance system. The watermark information is embedded into every 8 times 8 block in the coefficient domain in encoding process and extracted watermark from each 8 times 8 block in the coefficient domain in decoding...
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