Results 251 to 260 of about 105,525 (290)
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SS-OFDMA: Spatial-Spread Orthogonal Frequency Division Multiple Access for Terahertz Networks
IEEE Journal on Selected Areas in Communications, 2021How to achieve efficient multiple access for Terahertz (THz) networks is still an open problem. The key obstacle is the extremely narrow angular coverage by a highly directional THz beam. Thus, a hybrid THzPrism beamforming (HTB) architecture is designed in this paper to greatly enlarge angular coverage by spreading frequency subcarriers to different ...
Bangzhao Zhai +3 more
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2012 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2012
Rapid increasing activity in Fiber To The Home (FTTH) deployment in Malaysia and general desired to eventually migrate to these systems inspire to the reduction in overall cost and components required to deploy FTTH. This paper proposed implementation of Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) in FTTH to ...
Nur Shazwani Mohd Noor +3 more
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Rapid increasing activity in Fiber To The Home (FTTH) deployment in Malaysia and general desired to eventually migrate to these systems inspire to the reduction in overall cost and components required to deploy FTTH. This paper proposed implementation of Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) in FTTH to ...
Nur Shazwani Mohd Noor +3 more
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OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference, 2008
A novel unidirectional path switched ring (UPSR) based on optical orthogonal frequency division multiple access (OFDMA) technologies is introduced. Two types of reservation-based and token-based multiple access control (MAC) protocols are proposed and compared.
Wei Wei +4 more
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A novel unidirectional path switched ring (UPSR) based on optical orthogonal frequency division multiple access (OFDMA) technologies is introduced. Two types of reservation-based and token-based multiple access control (MAC) protocols are proposed and compared.
Wei Wei +4 more
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Optical Orthogonal Frequency Division Multiple Access Networking for the Future Internet
Journal of Optical Communications and Networking, 2009To meet diverse, bandwidth-intensive applications envisioned in future optical networks, as well as address the shortcomings of the current Internet, novel networking technologies will be of great importance. We discuss several key issues for the future Internet, including network virtualization mechanisms, a programmable network architecture ...
Wei Wei +4 more
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Orthogonal frequency‐division multiple access and its application to CATV networks
European Transactions on Telecommunications, 1998AbstractWe introduce the concept of orthogonal frequency‐division multiple access (OFDMA) and investigate its application to send upstream information from subscriber premises to the cable head‐end in cable TV (CATV) networks. The carrier and timing synchronizations needed to ensure orthogonality between different subscriber signals are achieved by ...
Hikmet Sari, Georges Karam
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Base station cooperation in orthogonal frequency division multiple access (OFDMA) systems
2009 IEEE 17th Signal Processing and Communications Applications Conference, 2009Achieving the targeted data rates for next generation wireless communication systems requires using frequency reuse ratio 1 in these systems, but this in turn results in significant intercell interference observed especially by the users near cell edges.
Turgut Baris Tokel, Defne Aktas
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Concurrency and Computation: Practice and Experience, 2012
SUMMARYThis paper investigates the problem of multiuser multimedia communication over orthogonal frequency‐division multiple‐access downlink systems. A cross‐layer design is proposed to maximize the received video quality of all the users subject to the network resource constraint.
Fan Li, Danyang Zhang, Minghui Wang
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SUMMARYThis paper investigates the problem of multiuser multimedia communication over orthogonal frequency‐division multiple‐access downlink systems. A cross‐layer design is proposed to maximize the received video quality of all the users subject to the network resource constraint.
Fan Li, Danyang Zhang, Minghui Wang
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Orthogonal Frequency Division Multiplexing and Code Division Multiple Access Systems
2021Abstract Chapter 8 presents modern multi-user and multicarrier communication systems based on code division multiple access technology and orthogonal frequency division multiple access technology. Analogue, digital, and discrete orthogonal frequency division multiple access systems are presented separately and then inter-related from ...
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Orthogonal Frequency Division Multiple Access (OFDMA)
2018This chapter presents a brief overview of the OFDMA technique used in 4G WiMAX (Worldwide Interoperability for Microwave Access) and 4G LTE (Long-Term Evolution) cellular system. It is shown that OFDMA is an extension of FDMA, where each frequency band is placed at the null of the adjacent frequency band.
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A Novel Time Domain Synchronous Orthogonal Frequency Division Multiple Access Scheme
GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference, 2009Time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) outperforms cyclic prefixed-OFDM (CP-OFDM) in spectrum efficiency at the expense of higher complexity. Up to now, TDS-OFDM has only been used in unidirectional transmission, such as broadcasting applications.
Linglong Dai +4 more
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