OFDMA for the 4/sup th/ generation cellular networks

Parsaee, Gholamreza; Yarali, Abdulrahman

doi:10.1109/ccece.2004.1347712

Cited by 21 publications

(14 citation statements)

References 31 publications

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“…A sufficiently long cyclic prefix in OFDMA guarantees the complete elimination of MAI and multipath interference which would be perfect to work with the bandwidth efficient higher order modulation schemes such as QAM for broad band communications [16]. Three approaches have also been specified to enhance the performance of an OFDMA system, namely Random Frequency Hopping(FH), Adaptive FH, and adaptive modulation [17].…”

Section: Dimensioning Aspects Of Ofdmamentioning

confidence: 99%

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OFDMA as the Technology for the Next Generation Mobile Wireless Internet

Hussain

Khokhar

et al. 2007

2007 Third International Conference on Wireless and Mobile Communications (ICWMC'07)

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The development of wireless systems, with the profound focus on the Internet, and mobile computing platforms has generated much interest in mobile data network access, particularly the Broadband wireless communication system. The choice for the appropriate technologies that will specifically suit the applicability for the Next Generation mobile wireless internet system will be based on various factor from high speed connectivity to mobility. Since OFDMA (Orthogonal Frequency Division Multiple Access), based on OFDM, can overcome signaling transmission barriers and increase transmission speed, while coping with unpredictable changes of the radio frequency environment, it is well suited for mobility applications in the wireless broadband network.

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Section: Dimensioning Aspects Of Ofdmamentioning

confidence: 99%

“…Table1: OFDMA System Features and Parameters [22][23] [17] Following additional features enhance the system characteristics [ …”

Section: Ofdma Air Interfacementioning

confidence: 99%

OFDMA as the Technology for the Next Generation Mobile Wireless Internet

Hussain

Khokhar

et al. 2007

2007 Third International Conference on Wireless and Mobile Communications (ICWMC'07)

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“…OFDMA was originally suggested by Sari and Karam for cable TV (CATV) networks [3] and later adopted in the uplink of the interaction channel for digital terrestrial television (DVB-RCT) [4]. More recently, it has become part of the emerging IEEE 802.16 standards for wireless metropolitan area networks (WMANs) [5] and is currently attracting vast research attention from both academia and industry as a promising candidate for next generation broadband wireless networks [6].…”

Section: Introductionmentioning

confidence: 99%

A Novel Time Domain Synchronous Orthogonal Frequency Division Multiple Access Scheme

Dai

Wang

et al. 2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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Time-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. The overwhelming complexity of removing the implicitly superposed interferences between the PN sequences and IDFT information blocks, caused by multiple users, hinders the application of time-domain synchronous orthogonal frequency division multiple access (TDS-OFDMA) in multi-user communication scenarios.To solve this problem, this paper proposes a novel TDS-OFDMA scheme, including joint cyclicity reconstruction and joint channel estimation, utilizing the new "time-space two-dimensional frame structure". Theoretical analysis and computer simulation show that the proposed scheme not only can achieve the purpose of multiple access but also has an even better system performance in mobile environment than the conventional single-user TDS-OFDM system.

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“…Furthermore, OFDM cooperating with FDMA, which is referred to as orthogonal frequency-division multiple access (OFDMA), provides more flexibility in managing channel bandwidth and transmission power because the available subcarriers in an OFDM symbol are partitioned into groups and assigned to different users [1].…”

Section: Introductionmentioning

confidence: 99%

A Baseband Transceiver for IEEE 802.16e-2005 MIMO-OFDMA Uplink Communications

Lin

Ting³

2007

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference

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In this paper, a 2x2 multiple-input multiple-outputorthogonal frequency division multiple access (MIMO-OFDMA) uplink transceiver based on IEEE 802.16e-2005 standard is proposed. Carrier frequency offset (CFO) and multipath channel impairments are considered. To mitigate the CFO problems in multiuser environment, an inter-carrier-interferencecancellation-based (ICI-cancellation-based) CFO estimator is proposed. The proposed CFO estimator measures energy dispersion of data compensated by ICI cancellation and channel equalization. With measured energy dispersion, correct CFOs can be obtained by running an iterative search. Compared with other designs, the proposed CFO estimator is more robust in transmission conditions and types of subcarrier allocations. Simulation results demonstrate that the proposed transceiver outperforms others in mean-square-error (MSE) and bit-errorrate (BER) performance.

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OFDMA for the 4/sup th/ generation cellular networks

Cited by 21 publications

References 31 publications

OFDMA as the Technology for the Next Generation Mobile Wireless Internet

OFDMA as the Technology for the Next Generation Mobile Wireless Internet

A Novel Time Domain Synchronous Orthogonal Frequency Division Multiple Access Scheme

A Baseband Transceiver for IEEE 802.16e-2005 MIMO-OFDMA Uplink Communications

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