Results 271 to 280 of about 244,698 (338)
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2010
An alternative to frequency division and time division multiple access schemes is provided by code division multiple access (CDMA), which permits multiple users to transmit simultaneously over a channel while occupying the same frequency band. This is effected by assigning a unique code or signature to each user.
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An alternative to frequency division and time division multiple access schemes is provided by code division multiple access (CDMA), which permits multiple users to transmit simultaneously over a channel while occupying the same frequency band. This is effected by assigning a unique code or signature to each user.
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1996
Spread spectrum systems were originally developed for military applications, to provide antijam and low probability of intercept communications by spreading a signal over a large frequency band and transmitting it with a low power per unit bandwidth [73], [247], [286].
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Spread spectrum systems were originally developed for military applications, to provide antijam and low probability of intercept communications by spreading a signal over a large frequency band and transmitting it with a low power per unit bandwidth [73], [247], [286].
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Optical phase coding for code-division multiple access networks
IEEE Photonics Technology Letters, 1992An all-optical code-division multiple access (CDMA) network is presented which uses optical phase information to encode and decode transmitted data from a low-coherence source, using simple, compact, reconfigurable optical delay networks. The use of a master encoding network to provide a reference for the system is demonstrated experimentally, and ...
Griffin, R.A. +2 more
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Coherence coding for photonic code-division multiple access networks
Journal of Lightwave Technology, 1995We analyze a code-division multiple access technique where information is optically encoded by manipulating the coherence between a pair of transmitted signals. Key features are intrinsic security, operation of the receiver at only the bit rate of a single channel, and reconfiguration without switching optical delays, which are considerable advantages ...
Griffin, R.A. +3 more
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1991
In code-division multiple access (CDMA) satellite systems, uplink stations are identified by uniquely separable address codes embedded within the carrier waveform. Each uplink station uses the entire satellite bandwidth and transmits through the satellite whenever desired, with all active stations superimposing their waveforms on the downlink. Thus, no
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In code-division multiple access (CDMA) satellite systems, uplink stations are identified by uniquely separable address codes embedded within the carrier waveform. Each uplink station uses the entire satellite bandwidth and transmits through the satellite whenever desired, with all active stations superimposing their waveforms on the downlink. Thus, no
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On the construction of 2/sup n/ codes for optical code-division multiple-access
IEEE Transactions on Communications, 1995An optical orthogonal code (OOC), intended for optical code-division multiple-access (CDMA), is a collection of (0,1) sequences with good correlation properties (i.e., high autocorrelation peaks with low sidelobes, and low crosscorrelation values). A "serial" coding architecture for optical CDMA has been introduced and found particularly suitable for ...
Guu-Chang Yang, Wing C. Kwong
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Tandem Spreading Network-Coded Division Multiple Access
IEEE Transactions on Industrial Informatics, 2017Massive machine-type communication (MMTC) is the key technology to meet the flourishing Internet of things industry. One prominent characteristic of MMTC is massive connections which brings a critical challenge of multiple access interference (MAI) on channel estimation, user identification, and data detection.
Guo-Yu Ma +3 more
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Broadband code division multiple access
1996 IEEE Aerospace Applications Conference. Proceedings, 2002The use of code division multiple access (CDMA) techniques for wireless communications systems, both terrestrial based and satellite based, has become of interest because of certain distinctive characteristics of spread spectrum waveforms relative to those of more conventional signals.
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A semiclassical analysis of optical code division multiple access
IEEE Transactions on Communications, 1991A model noncoherent, optical, asynchronous, CDMA system is described. The error rate for a single-user matched-filter receiver that is valid for arbitrary photomultipliers and signature sequence sets, adheres to the semiclassical model of light, and does not depend on approximations for large user groups, strong received optical fields, or chip ...
David Brady, Sergio Verdú
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A Code-Division Multiple-Access Local Area Network
IEEE Transactions on Communications, 1987In this paper, we propose a code-division multiple-access (CDMA) approach as a method of local area networking, and analyze its physical performance. The proposed system has the advantage of a multiehannel multiaccess local area network, and provides the capability of easy access to different kinds of traffics, such as voice and data.
Jong-Rak Lee, Chong-Kwan Un
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