Results 171 to 180 of about 122,557 (242)
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A Capacity Comparison Between MC-CDMA and CP-CDMA
IEEE Vehicular Technology Conference, 2006In this paper, we consider the capacity behaviors of MC-CDMA and CP-CDMA systems by the uses of MMSE receivers. The averaged capacities are derived for the two systems, having a finite spreading factor, in Rayleigh fading environment. The closed-form solutions have been obtained, which show that the capacity of the MC-CDMA is slightly larger than that ...
Meng Ma +3 more
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Gated-CDMA: Frequency-Domain Equalization for CDMA Systems
IEICE Transactions on Communications, 2005While CDMA systems are proven to be excellent solutions for cellular communications, they suffer from severe multi-path interferences and are hard to support high-data-rate transmissions over frequency-selective fading channels. This letter introduces a novel downlink transmission method for next generation mobile communication systems.
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OCDD/CDMA: a new DS/CDMA with orthonormal code diversity detection
IEEE Transactions on Communications, 2001Summary: The paper presents a new spread spectrum communication system called orthonormal code diversity detection (OCDD)/CDMA system based on the novel concept of orthonormal-basis diversity, which is a generalization of the existing spread spectrum diversity concepts such as path diversity and frequency diversity.
Kim, Byoung-Hoon, Lee, Byeong Gi
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Blind joint equalization and multiuser detection in dispersive MC-CDMA/MC-DS-CDMA/MT-CDMA channels
MILCOM 2002. Proceedings, 2003The problem of demodulation of multiuser orthogonal frequency division multiplex-code division multiple access (OFDM-CDMA) in the presence of both multiple access interference (MAI) and intersymbol interference (ISI) is considered. Three types of OFDM-CDMA are presented: multicarrier code division multiple access (MC-CDMA), multicarrier direct sequence
W. Nabhane, H.V. Poor
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OFDM-CDMA versus DS-CDMA: performance evaluation for fading channels
Proceedings IEEE International Conference on Communications ICC '95, 2002In code division multiple access (CDMA) systems direct sequence (DS) applying maximum ratio combining (MRC) at the receiver has achieved high interest for mobile communications. A second and rather novel technique is orthogonal frequency division multiplexing (OFDM) applying maximum-likelihood detection (MLD) at the receiver.
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Performance Analysis of DS-CDMA and MC-CDMA Systems
2018 9th IEEE Annual Ubiquitous Computing, Electronics & Mobile Communication Conference (UEMCON), 2018In this paper, a performance analysis of DS-CDMA and MC-CDMA is conducted. With DS-CDMA, data is spread using a spreading sequence in the time domain. In contrast, with MC-CDMA, data is spread over different sub-carriers using a spreading sequence in the frequency domain. The comparison of DS-CDMA and MC-CDMA is presented under an AWGN channel.
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2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers, 2009
We consider the problem of simultaneous power and code-channel allocation for a secondary transmitter/receiver pair coexisting with a primary code-division multiple-access (CDMA) system. We develop a novel computationally feasible solution using semidefinite programming. Simulation studies illustrate the theoretical developments.
Kanke Gao +3 more
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We consider the problem of simultaneous power and code-channel allocation for a secondary transmitter/receiver pair coexisting with a primary code-division multiple-access (CDMA) system. We develop a novel computationally feasible solution using semidefinite programming. Simulation studies illustrate the theoretical developments.
Kanke Gao +3 more
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International Journal of Wireless Information Networks, 1995
A Broadband Code Division Multiple Access (B-CDMA) technique is presented that will overlay the existing cellular telephone spectrum (825 to 894MHz). The overlay will provide additional capacity to the network while allowing high quality voice and high speed data services to be coexistent with the existing cellular services (AMPS and TDMA).
Donald L. Schilling +3 more
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A Broadband Code Division Multiple Access (B-CDMA) technique is presented that will overlay the existing cellular telephone spectrum (825 to 894MHz). The overlay will provide additional capacity to the network while allowing high quality voice and high speed data services to be coexistent with the existing cellular services (AMPS and TDMA).
Donald L. Schilling +3 more
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Third generation cellular (3G): W-CDMA and TD-CDMA
Wescon/98. Conference Proceedings (Cat. No.98CH36265), 2002The International Telecommunication Union (ITU) is in the process of developing standards for the third generation (3G) mobile cellular system, also known as IMT2000. Meanwhile, the European Telecommunications Standard Institute (ETSI) has adopted and recommended W-CDMA for voice and data, and TD-CDMA (DS) for other terrestrial services.
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Proceedings of IEEE Vehicular Technology Conference (VTC), 2002
CDMA mobile stations using the North American cellular system rely upon the IS-41 network protocol for intersystem handoff and roaming. This paper describes the IS-95 air interface and corresponding IS-41 protocols for intersystem handoff, mobile station location determination, and call delivery.
A.R. Holcman, E.G. Tiedemann
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CDMA mobile stations using the North American cellular system rely upon the IS-41 network protocol for intersystem handoff and roaming. This paper describes the IS-95 air interface and corresponding IS-41 protocols for intersystem handoff, mobile station location determination, and call delivery.
A.R. Holcman, E.G. Tiedemann
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