Results 261 to 270 of about 214,002 (340)
Some of the next articles are maybe not open access.
Optical Code Division Multiple Access
Optics and Photonics News, 2003Code division multiple access (CDMA) allows multiple users access to limited-bandwidth networks. The Defense Advanced Research Projects Agency has launched an ambitious program aimed at demonstrating technology for an advanced network based on optical CDMA.
openaire +1 more source
Code division multiple access using Hermitean codes
Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications, 2002Reed-Solomon (RS) codes present some desirable properties that make them useful in the generation of hopping sequences, for frequency hopping code division multiple access (FH CDMA). The algebraic geometric codes include the RS codes as a special case, therefore it is natural to propose the former as a candidate to FH CDMA.
F.M. Assis, M.S. Alencar
openaire +1 more source
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.
openaire +1 more source
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.
openaire +1 more source
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].
openaire +1 more source
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].
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
Photonic code-division multiple-access communications
Fiber and Integrated Optics, 1997Photonic code-division multiple access schemes have been proposed since the 1970s. Although there are many published proposals for new coding schemes, there are many less experimental verifications of these schemes, even fewer reports of successful data transmission, and no commercial systems.
Sampson, David +2 more
openaire +2 more sources
Femtosecond Optical Code-Division Multiple-Access
Ultrafast Electronics and Optoelectronics, 1997We discuss a project aimed at demonstrating the physical feasibility of a novel, high-speed communications network based on encoding and decoding of coherent ultrashort light pulses. Relevant component technologies, such as fiber pigtailed pulse shapers, femtosecond dispersion compensation, and ultrafast optical thresholders, are also discussed.
A. M. Weiner +2 more
openaire +1 more source
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.
openaire +1 more source
Guest Editorial Code Division Multiple Access Networks III
IEEE Journal on Selected Areas in Communications, 1994This special issue covers the topics: power control, multiuser receiver and joint detection, network aspects, adaptive equalisation, coding aspects, broadband CDMA systems, and optical systems. >
A.K. Elhakeem +4 more
openaire +1 more source
Optical Code Division Multiple Access
1998The code division multiple access (CDMA) is under consideration for broadband video delivery over fiber-optic local area networks (LANs). There are several approaches for implementing classical CDMA principles in the optical domain, classified as incoherent, coherent and approaches based on encoding in frequency spectrum.
Srdić, Ida +2 more
openaire +2 more sources