Results 291 to 300 of about 1,030,149 (344)
Some of the next articles are maybe not open access.
Dispersive chirp combining spread-spectrum system
[Proceedings] Singapore ICCS/ISITA `92, 1992Chirp (linear FM) filters are dispersive in nature; that is, the time delay of the filter varies with frequency. This dispersive nature can be exploited to perform dispersive combining of the resolved multipath components. Frequency shiftings are performed on the received multipath signals to compensate for the path delays.
C.H. Suhartanto, C.D. McGillem
openaire +1 more source
Low cost spread spectrum systems
International Conference on Consumer Electronics, 1989Presents a broad look at spread spectrum communications systems and in particular discusses the tradeoffs and characteristics of low cost implementations of this modulation technique. >
openaire +1 more source
Recent spreading codes for spread spectrum communication systems
Electronics and Communications in Japan (Part I: Communications), 1992AbstractThis 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
openaire +1 more source
Concatenated Sequences for Spread Spectrum Systems
IEEE Transactions on Aerospace and Electronic Systems, 1981Concatenated sequences are suggested and developed for use in spread spectrum (SS) systems. Special receiver realization is discussed and it is shown that the concatenated sequences offer great advantage in reducing the size of the matched filter correlators (MFC) in the SS receiver. Experimental systems have been built using concatenated sequences and
S.L. Maskara, J. Das
openaire +1 more source
Performance of MSK spread spectrum systems
Proceedings of the IEEE, 1983An exact expression for the processing gain of a direct sequence spread spectrum communication system using MSK spreading is derived. This extends previous results for systems using QPSK spreading.
openaire +1 more source
Secure chaotic spread-spectrum communication systems
14th Annual International Conference on Wireless and Optical Communications, 2005. WOCC 2005, 2005Summary form only given. In a hostile environment, a commercial or military interceptor may try to detect the presence of radio frequency (RF) energy and then to determine the location of its transmitter. Although direct-sequence (DS) spreading signals have generally good low probability of intercept (LPI) performance, there still exist some intercept ...
null Jin Yu, null Yu-Dong Yao
openaire +1 more source
Adaptive synchronization for spread spectrum systems
Proceedings of Vehicular Technology Conference - VTC, 2002Code acquisition in direct sequence spread-spectrum systems must occur before data demodulation can start. In this paper, a new hybrid approach to code acquisition is proposed by using an adaptive filter. The proposed system tests several phases concurrently and, hence, offers fast acquisition with small hardware requirements. Moreover, the same system
M.G. El-Tarhuni, A.U. Sheikh
openaire +1 more source
Interference suppression in spread spectrum systems
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications, 2002The interference immunity of a spread spectrum digital communication system corrupted by interference can be significantly enhanced by excising the interference prior to cross correlation of the received signal with the possible transmitted reference signals. In this paper we treat methods for excising narrowband (partial band) and broadband (impulsive)
openaire +1 more source
Acquisition Time Performance of PN Spread-Spectrum Systems
IEEE Transactions on Communications, 1977This paper develops the mean and variance of the time to acquire for single dwell time PN-type spread-spectrum systems. A model is specified, and then exact results are obtained by use of the generating function for the acquisition process. The paper is somewhat tutorial in that the analysis technique is developed in a logical step-to-step manner for ...
Holmes, Jack K., Chen, Chang C.
openaire +2 more sources
Spread spectrum communication system with chaotic frequency modulation
Chaos: An Interdisciplinary Journal of Nonlinear Science, 2005A new spread spectrum communication system utilizing chaotic frequency modulation of sinusoidal signals is discussed. A single phase lock loop (PLL) system in the receiver is used both to synchronize the local chaotic oscillator and to recover the information signal. We study the dynamics of the synchronization process, stability of the PLL system, and
Volkovskii, A. R. +3 more
openaire +3 more sources