Results 251 to 260 of about 517,702 (295)

Cryptographic Spread Spectrum Relay Communication

2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies, 2008
Spread spectrum (SS) is a technique of secure communication, which increases resistance to natural interference and jamming, and prevents detection. If a cryptographically secure pseudo random sequence is used, the communication becomes more secure. Generally some short pseudo-random sequences are used in Spread spectrum.
Zahoor Ahmed, J. P. Cances, V. Meghdadi
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Channel characterisation for spread spectrum satellite communications

Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications, 2002
The paper examines the characteristics of satellite propagation channels for spread spectrum communications. Based on measurement campaigns at L-band, the signal bandwidth is determined when the channel becomes frequency-selective. A wideband channel model for land mobile satellite (LMS) services is presented which characterises the time-varying ...
Jahn, A., Bischl, H., Heiß, G.
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SPREAD SPECTRUM COMMUNICATION THROUGH MODULATION OF CHAOS

International Journal of Bifurcation and Chaos, 1993
In this letter we demonstrate experimentally how Chua’s circuits can be used to implement a secure communication system. This system is compared to another system proposed earlier. This system has the advantage of transmitting a spread spectrum signal and is also more secure in the sense that better parameter matching is required in order to recover ...
Halle, K. Sean, Wu, Chai Wah, Itoh, Makoto, Chua, Leon O.   +3 more
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Spread spectrum for personal communication

29th IEEE Vehicular Technology Conference, 1979
A cellular technique utilizing spread-spectrum signals is proposed for personal communication systems and some of the requirements for the system are analyzed. Specific items that are discussed include bandwidth requirements, number of unique addresses, limits on the number of active users, power requirements, signal penetration and self-regulating ...
G.R. Cooper, R.W. Nettleton
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Self-encoded spread spectrum communications

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341), 2003
We present a novel spread spectrum communication system for the secure transmission of digital information. The approach is based on the unconventional self-encoding principles that we have developed at the University of Nebraska for the modulation and detection of spread spectrum signals.
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Introduction to spread spectrum communications

1985
This book offers an introduction to the methods and concepts applied in modern communications, and suggests areas for future development and refinement. The term spread spectrum is used to describe a class of modulation techniques in which the data stream is coded in such a way that the total information rate is higher than the data rate. However, this
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Consumer Communications Based on Spread Spectrum Techniques

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94), 1995
This paper shows consumer applications of spread spectrum techniques in the following areas: power line communication, data carrier, radio remote control, ISM wireless LAN, vehicle to vehicle communication, and digital TV broadcasting. One of the most difficult problems for a spread spectrum communication system is how to synchronize the receiver to ...
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Spread Spectrum Techniques for Mobile Communications

2004
Wireless mobile communications has greatly benefited from the adoption of advanced signal processing techniques and components. In particular, the advent of low-cost very large scale integrated (VLSI) chips has allowed the design and implementation of efficient communications systems based on spread-spectrum signals, namely, the different code-division
GIANNETTI, FILIPPO, LUISE, MARCO
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Recent spreading codes for spread spectrum communication systems

Electronics and Communications in Japan (Part I: Communications), 1992
AbstractThis paper presents recent spreading codes and their applications to spread spectrum (SS) systems.First, co‐channel interference in spread spectrum multiple access communication systems (SSMA) and cross‐correlation functions are described, and the relationship between new “No sequences” with low cross‐correlations and other well known sequences
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Spread-Spectrum Multiple-Access Communications

1981
In a direct-sequence spread-spectrum multiple-access communications system several asynchronous signals simultaneously occupy the same channel. Each of the signals employs a signature sequence which is selected to have certain desirable correlation properties.
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