Spread Spectrum
Novel Attacks on Spread-Spectrum Fingerprinting
... Gaussian, spread-spectrum fingerprinting, where each user is identified by a random, Gaussian signal which is added to the copyrighted file (host ...
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Millimetre wave quasi optical signal processing and spread spectrum techniques
... The receiver optics are req uired to handle the incoming spread spectrum millimetre wave bea con signals and perform two functions on them. Firstly, as will be discussed in the next chapter, the ...
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Spread Spectrum Sensing Techniques for Transformer Frequency Response Data
... channels, spread spectrum is proposed in the literature [3]. Spread spectrum can be defined as a modulation technique in which pseudo-random sequence is used in expanding the actual bandwidth ...
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Hierarchical Spread Spectrum Fingerprinting Scheme Based on the CDMA Technique
... The Cox’s method has excellent robustness against signal processing, geometric distortions, subterfuge attacks, and so forth [2]. However, the (quasi-)orthogonality of the fingerprinting sequences is not theoretically ...
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New PN Even Balanced Sequences for Spread Spectrum Systems
... 1965, he was a Radar Engineer at the Portuguese Air Force Army. In 1966, he joined ITT, Lisbon, as a Production Engineer and in 1967 held the position of Quality Control Engineer at the same company. In 1968 he became ...
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Performance Improvement of Wireless Communications Using Frequency Hopping Spread Spectrum
... hopping spread spectrum is a transmission technology used in wireless networks and a technique to generate spread spectrum by hopping the carrier fre- quency FHSS uses narrow band signal which ...
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Simulation of Spread Spectrum Radar Using Rake at the Receiver End
... the spread spectrum technology in wireless mobile ...undetectable. Spread spectrum radio has long been used in military communications because of this advantage ...called spread ...
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Spread Spectrum Is Good-But it Does Not Obsolete NBC v. U.S.!
... Radio interference remains a genuine problem--and neither using spread spectrum nor keeping the potentially interfering signal below the noise floor eliminates interfe[r] ...
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A Survey on Spread Spectrum Methods for Image Watermarking in Noisy Environment
... Watermarking could be a terribly active analysis field with lots of applications. Spread-spectrum technique below separate ripple domain has been introduced. The experimental results show that PSNR has been ...
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Antenna arrays in multi user detection of spread spectrum signals
... Spread spectrum systems have found wide applications in many areas of military communications. They offer a number of advantages. For example, they are inherently more resistant to jamming. Depending upon ...
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An Efficient Method of Spread Spectrum Logon for Satellite Terminal in DVB Systems
... In the satellite communication system, the antenna of the portable mobile terminal has a small aperture, and there is a risk of frequent online and offline in the case of movement and the logon process is cumbersome. ...
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Doppler Spread Spectrum of a Circularly Moving Receiver in an Anechoic and a Reverberation Chamber
... Doppler spread spectrum is the inverted V- or ...Doppler spread spectra and theoretical Doppler mask, Bell model in ...the spectrum are the same, and the values of f d increase along with the ...
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Spectrum Sharing in an ISM Band: Outage Performance of a Hybrid DS/FH Spread Spectrum System with Beamforming
... Hybrid spread spectrum (SS), where a direct-sequence modulated signal is frequency hopped, is an attractive ...fixed spectrum systems but it has great potential in dynamic spectrum access ...
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Extracting Spread-Spectrum Hidden Data from Digital Media
... Recently, developing data embedding technologies are being seen to pose a threat to personal privacy, commercial, and national security interests. In this work, we focus our attention on the blind recovery of secret ...
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Radar Communication Integration Based on MSK LFM Spread Spectrum Signal
... sequence spread spectrum (DSSS) is to use a set of spread spectrum codes to represent the information symbols, and then spread the spectrum to modulate the carrier ...the ...
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Medium Access in Spread-Spectrum Ad Hoc Networks with Multiuser Detection
... In this way, the signature exchange (R2) is implicitly realized via an exchange of the ANN message. Therefore, the MUD-MAC does not require the additional crosslayer overhead for exchanging and maintaining a whole set of ...
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Simulation and Validation of Spread Spectrum Technique in In- Orbit Testing of the Satellite Transponder
... the spread spectrum system is ...the spread spectrum measurement system for the in-service characterization of the transponder without much intruding the data ...
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Analysis and implementation of steganography on JPEG using LSB and Spread Spectrum method
... Least Significant Bit is a method that is done by replacing less meaningful data bits with bits of secret messages, while Spread Spectrum [10] is a method that randomly scrambles the message in its ...
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Analysis of Steganography on TIFF Image using Spread Spectrum and Adaptive Method
... using spread spectrum and adaptive method on TIFF as a format image and the value of MSE and PSNR is depended on the image size and how much character that inserted into the carrier ...and spread ...
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A Comparison of Steganography in the GIF Image using LSB and Spread Spectrum Method
... Analysis: From the results of previous experiments against gif image about how much the message maximum number of characters that can be inserted by the method of Least Significant Bit (LSB) and also the spread ...
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