Results 241 to 250 of about 416,241 (289)

Direct-sequence spread-spectrum communications for multipath channels

IEEE Transactions on Microwave Theory and Techniques, 2002
Direct-sequence spread spectrum has been adopted for many current and future cellular CDMA communication systems, and it is also used widely for military communication networks and systems. One of the motivations for employing direct-sequence spread spectrum is its ability to combat fading due to multipath propagation. The use of direct-sequence spread
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High-rate direct-sequence spread spectrum

IEEE Military Communications Conference, 2003. MILCOM 2003., 2004
Direct-sequence spread spectrum is popular for commercial wireless local-area networks, because license-free operation is permitted in certain frequency bands. The extensive development of equipment for such applications makes it attractive to investigate the use of the commercial technology for military communication networks.
M.B. Pursley, T.C. Royster, M.Y. Tan
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Direct-Sequence Spread Spectrum with Variable Spreading Sequence for Jamming Immunity

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST), 2019
Jamming attacks can limit the availability of wireless networks and can lead to significant re-transmissions and increased power consumption. Over the past decades DSSS has been utilized to consolidate jamming-resistant communication. Such a system is relatively immune to jamming interference when the spreading sequence is unknown to the jammer ...
Muhammad Ahsan Munir, Abdur Rahman M. Maud   +1 more
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Trellis-coded direct-sequence spread-spectrum communications

IEEE Transactions on Communications, 1994
This paper considers the application of trellis coding techniques to direct-sequence spread-spectrum multiple-access (DS/SSMA) communication. The unique feature of the trellis codes considered is that they are constructed over the set of possible signature sequences rather than over some standard 2-D signal constellation.
B.D. Woerner, W.E. Stark
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A direct-sequence spread spectrum transceiver chip

Proceedings of IEEE Custom Integrated Circuits Conference - CICC '93, 2002
A single-chip spread-spectrum digital transceiver (CYCHIP) has been designed and fabricated in 0.7-micron LSI logic gate array technology. This chip includes a spread-spectrum transmitter, a spread-spectrum receiver, a time division duplex (TDD) control logic, a multiplexer, two FIFOs (first-in, first-out's) a 64-kbps voice codec (pulse code modulation)
D. Avidor, null Soei-Shin Hang, J. Omura
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Markov oscillators and direct sequence spread spectrum

Proceedings of ICC'97 - International Conference on Communications, 2002
This paper presents a concept under development, that of dynamically coloring the spectrum of a pseudorandom spreading code in order to aid slow rate data communication in a very poor channel. The method seems to hold promise for some difficult industrial communications problems, especially for wireless random access communications in time varying ...
J.E. Hershey, A.A. Hassan
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Neural Direct Sequence Spread Spectrum Acquisition

2004
A neural network model is described which simulate the Parallel Matching Filtering (PMF) for Direct Sequence Spread Spectrum (DSSS) signal acquisition. This system is based on training the Counter Propagation Network (CPN) in all half chip phase shifts of the Pseudo Noise (PN) code.
Tarek Elhabian, Bo Zhang, Dingrong Shao
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Range estimation using direct sequence spread spectrum

2014 International Conference on Communication and Signal Processing, 2014
RADAR (Radio Wave Detection And Ranging) systems are widely used now days for detecting a target, obtaining its location along with direction and velocity of detected object. Most challenging part in RADAR system is to getting better accuracy and resolution.
Nilesh Shirude, R.P. Pinto, M.S. Panse
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Detection of direct sequence spread spectrum signals

2023
Since early experimentation in the late 1800's, wireless communication has become increasingly important and has been widely adopted by civilian and military markets worldwide. The proliferation of wireless communication systems presents new challenges, threats and opportunities for society and government institutions.
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Direct sequence spread spectrum Walsh-QPSK modulation

IEEE Transactions on Communications, 1998
We present Walsh-quadrature phase-shift keying (Walsh-QPSK) pseudonoise (PN) modulation schemes for both coherent and noncoherent direct-sequence code-division multiple-access (DS-CDMA) systems, wherein the PN spreading sequences for in-phase and quadrature data in a conventional QPSK PN modulation scheme are coded by Walsh sequences indexed by a ...
null Dongwook Lee, null Hun Lee, K.B. Milstein   +2 more
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