Results 201 to 210 of about 295,912 (261)
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IRE Transactions on Communications Systems, 1977
This paper describes an idealized spread-spectrum communication system. The processing gain concept is developed as a measure of a well-designed system's robust performance against independent wide-sense stationary interference. Multipath and repeater jammer rejection, partial correlation problems, and security requirements are related to spread ...
R Scholtz
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This paper describes an idealized spread-spectrum communication system. The processing gain concept is developed as a measure of a well-designed system's robust performance against independent wide-sense stationary interference. Multipath and repeater jammer rejection, partial correlation problems, and security requirements are related to spread ...
R Scholtz
exaly +3 more sources
The Origins of Spread-Spectrum Communications
IEEE Transactions on Communications, 1982This monograph reviews events, circa 1920-1960, leading to the development of spread-spectrum communication systems. The WHYN, Hush-Up, BLADES, F9C-A/Rake, CODORAC, and ARC-50 systems are featured, along with a description of the prior art in secure communications, and introductions to other early spreadspectrum communication efforts. References to the
R Scholtz
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Improvement of direct spreading spectrum by multi-spreading spectrum
IET 3rd International Conference on Wireless, Mobile and Multimedia Networks (ICWMMN 2010), 2010In the direct spreading spectrum(DSS) the number of length of spreading is less, and the several errors will lead to sharp decrease of peak-to-sidelobe ratio and the errors sometimes cannot be corrected. To solve this problem, a new method of Multi-Spreading Spectrum (i.e. MSS) with error-correcting ability is proposed.
null Fan Jing, null Xu Shufang
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The Spread Spectrum in Computing
Computing in Science & Engineering, 2006From time to time, I find it necessary to remind myself of how broadly computing applications are spread across the sciences and engineering. This breadth extends not only along the axes of computing complexity and disciplinary diversity, but also along task and sophistication. Over the years, this magazine has certainly highlighted the former two, but
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Obscure Spread Spectrum watermarking
2011 IEEE International Conference on Multimedia and Expo, 2011This paper investigates previous blind SS schemes which do not employ the host objects in the detection process, especially the Improved Spread Spectrum (ISS) scheme. It shows that these schemes result in a high false positive probability even in the absence of any attack.
Yongdong Wu, Szeling Yeo
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Spread spectrum for commercial communications
IEEE Communications Magazine, 1991The authors describe how spread spectrum operates and explain why the FCC has allocated several spectral bands for spread spectrum. They examine what is wrong with the spectrum allocations the way they are now. They show who is using and will use spread spectrum and why.
Donald L. Schilling +4 more
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Passive spread-spectrum steganalysis
2011 18th IEEE International Conference on Image Processing, 2011We consider the problem of passive spread-spectrum steganalysis where the objective is to decide the presence or absence of spread-spectrum hidden data in a given image (a binary hypothesis testing problem). Unlike conventional feature-based approaches, we describe an unsupervised (blind) low-complexity approach based on generalized least-squares ...
Ming Li 0011 +4 more
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Spread spectrum image steganography
IEEE Transactions on Image Processing, 1999In this paper, we present a new method of digital steganography, entitled spread spectrum image steganography (SSIS). Steganography, which means "covered writing" in Greek, is the science of communicating in a hidden manner. Following a discussion of steganographic communication theory and review of existing techniques, the new method, SSIS, is ...
Lisa M. Marvel +2 more
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Spread-Spectrum Watermarking Security
IEEE Transactions on Information Forensics and Security, 2009This paper presents both theoretical and practical analyses of the security offered by watermarking and data hiding methods based on spread spectrum. In this context, security is understood as the difficulty of estimating the secret parameters of the embedding function based on the observation of watermarked signals.
Luis Pérez-Freire +1 more
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