Results 241 to 250 of about 105,525 (290)
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Proceedings of the IEEE, 2007
Orthogonal frequency division multiple access (OFDMA) has recently attracted vast research attention from both academia and industry and has become part of new emerging standards for broadband wireless access. Even though the OFDMA concept is simple in its basic principle, the design of a practical OFDMA system is far from being a trivial task ...
MORELLI, MICHELE, J. KUO, S. M. PUN
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Orthogonal frequency division multiple access (OFDMA) has recently attracted vast research attention from both academia and industry and has become part of new emerging standards for broadband wireless access. Even though the OFDMA concept is simple in its basic principle, the design of a practical OFDMA system is far from being a trivial task ...
MORELLI, MICHELE, J. KUO, S. M. PUN
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A cyclic frequency division non‐orthogonal multiple access system
International Journal of Communication Systems, 2021SummaryIn this paper, we have developed a downlink power domain non‐orthogonal multiple access (NOMA) system based on cyclic frequency division, where interleaved frequency division multiple access (IFDMA) is cyclically combined with NOMA. The newly developed cyclic frequency division NOMA (CFD‐NOMA) system has the benefit of both NOMA and IFDMA.
N. Sathya Sheela, S. Lenty Stuwart
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Orthogonal Frequency Division Multiple Access Fundamentals and Applications
2010Supported by the expert-level advice of pioneering researchers, Orthogonal Frequency Division Multiple Access Fundamentals and Applications provides a comprehensive and accessible introduction to the foundations and applications of one of the most promising access technologies for current and future wireless networks. It includes authoritative coverage
Chen, J, Serpedin, E, Ng, TS, Wu, YC
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An analysis of orthogonal frequency-division multiple access
GLOBECOM 97. IEEE Global Telecommunications Conference. Conference Record, 2002We analyze the performance of orthogonal frequency-division multiple access (OFDMA) for the return channel on CATV networks, and compare this technique to the well-known time-division multiple access (TDMA). We examine the basic implementation issues of OFDMA including clock and carrier frequency synchronization, power control and ranging, and point ...
H. Sari, Y. Levy, G. Karam
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Orthogonal frequency division multiple access with cyclic delay diversity
ITG Workshop on Smart Antennas (IEEE Cat. No.04EX802), 2005Cyclic delay diversity is a simple transmit diversity technique for coded OFDM systems with multiple transmit antennas. It does neither require an extended guard interval nor modifications of the standard OFDM receiver. We discuss the problem of choosing the cyclic delays and propose a solution which enables to exploit the full spatial diversity in ...
G. Bauch, J.S. Malik
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Time and frequency synchronization of orthogonal frequency division multiple access systems
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2002We propose a non-data aided synchronization algorithm for orthogonal frequency division multiple access systems. The method is applied to both quasisynchronous and asynchronous systems. The proposed algorithm does not require the transmission of training sequences or of repeated symbols and, differently from all available methods, our frequency ...
BARBAROSSA, Sergio +2 more
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Orthogonal Frequency Division Multiple Access in WiMAX and LTE: A Comparison
IEEE Communications Magazine, 2012<p>Orthogonal frequency-division multiple access has been adopted by both the WiMAX and Long Term Evolution standards, which are the two main contenders in the 4G wireless scenario. In this article, we do a detailed comparison of the implementation of OFDMA in LTE and WiMAX.
S. Srikanth +2 more
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Identification and classification of Orthogonal Frequency Division Multiple Access signals
2012 6th International Conference on Signal Processing and Communication Systems, 2012This paper proposes a scheme for identification and classification of Orthogonal Frequency Division Multiple Access (OFDMA) signals. Specifically, the cyclostationary pilot signature of an IEEE 802.16e standard compliant waveform is investigated.
Ryan Gray +4 more
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Indoor MIMO VLC systems using optical orthogonal frequency division multiple access
Optics Communications, 2021Abstract This paper proposes an indoor multiuser visible light communication (VLC) system using multiple lamps with orthogonal frequency division multiple access (OFDMA) techniques. For the users located in different places, the diversities of their channels help to optimally allocate the subcarriers to the users for high-speed transmissions ...
Jie Lian +4 more
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Applicability of Orthogonal Frequency Division Multiple Access in Satellite Communication
2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011In this paper, we introduce several technologies to adapt orthogonal frequency division multiple access (OFDMA) scheme to satellite environments. Maximizing the commonalities with the terrestrial system is one of the most important factors for cost-effective service delivery, which will finally bring successful deployment of the system.
Hee Wook Kim +5 more
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