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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

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Steganographic fiber-optic transmission using coherent spectral-phase-encoded optical CDMA

Wu, B. and Agrawal, A. and Glesk, I. and Narimanov, E. and Etemad, S. and Prucnal, P.R. (2008) Steganographic fiber-optic transmission using coherent spectral-phase-encoded optical CDMA. In: Lasers and Electro-Optics, 2008 and 2008. Conference on Quantum Electronics and Laser Science. IEEE, pp. 1-2. ISBN 978-1-55752-859-9

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Abstract

Spread spectrum (SS) has been used extensively in military radio communications to ensure low probability of intercept of a transmitted signal by an unintended receiver. Low probability of intercept is achieved using a unique code to spread the transmitted signal into noise-like signal having low spectral power density. The SS signal is submerged below the background noise, making it difficult to be detected by a hostile eavesdropper. Low probability of intercept is ensured because the original signal can only be recovered if the receiver knows the spreading code. The application of SS techniques in radio frequency wireless communications has been widely implemented using code-division multiple-access (CDMA), which provides both high spectral efficiency and steganographic security, , where only an authorized user knows of the existence of the secret message.