Abstract: Image-based steganography is the practice of embedding secret information into digital images with the intention to communicate the secret information. Embedding large sizes of secret information into digital images is one of the problems that image-based steganography encounters. The distortion of digital image increases with larger capacity, meaning that both are positively correlated. The latter makes image-based steganography fingerprints perceptually and statistically visible. In this paper, we propose a new spatial-domain steganographic scheme based on Bit-Plane Complexity Segmentation (BPCS). Experimental results reveals that the proposed algorithm offers better embedding performance compared with prior BPCS-based algorithms in terms of image quality and capacity.

• Publication Date: 09-Mar-2014
• DOI: 10.15224/978-1-63248-000-2-57
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Abstract: Diversity and data rate over multipath fading channels in wireless communication systems can be significantly enhanced by the combined use of orthogonal space-time block coding (OSTBC) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) techniques. However, to obtain the maximum benefits of the above schemes, the required antenna spacing at both the transmit and receive sideswill result in high-cost antenna deployments. Hence, the use of triple-polarized antennas appears to be a cost- and space-efficient alternative. In this paper, we model the triple-polarized MIMO channel and evaluate the error performance of OSTBC-MIMO-OFDM system using proposed channel model. Simulation result shows error performance improvement when using triple-polarized antennas in OSTBC-MIMO-OFDM systems compared to that of using spatially-separated uni-polarized antennas.

• Publication Date: 09-Mar-2014
• DOI: 10.15224/978-1-63248-000-2-58
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