A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2007; you can also visit the original URL.
The file type is application/pdf.
Filters
Timing and Frequency Synchronization for the Uplink of an OFDMA System
2004
IEEE Transactions on Communications
Preserved Fulltext
This paper deals with timing and frequency recovery for the uplink of an orthogonal frequency-division multiple access (OFDMA) system. ...
Theoretical analysis and computer simulations are used to assess the performance of the proposed synchronizers. ...
Timing and Frequency Synchronization for the Uplink of an OFDMA System Michele Morelli Abstract-This paper deals with timing and frequency recovery for the uplink of an orthogonal frequency-division multiple ...
doi:10.1109/tcomm.2003.822699
fatcat:7kknkpllhncmvgglpri2faj2se
Joint Timing Synchronization and Channel Estimation Using Perfect Sequence in Uplink Time Domain Synchronous OFDMA
2016
International Journal of Electronics and Telecommunications
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2016; you can also visit the original URL.
The file type is application/pdf.
This leads to multiple user interference due to timing offset and frequency offset. In this paper, the effect of timing offset and channel estimation in mobile broadband system is analysed. ...
Time Domain Synchronous Orthogonal Frequency Division Multiple Access (TDS-OFDMA) is used in mobile broadband wireless access scheme in uplink transmission. ...
In this paper, an efficient method for joint timing synchronization and channel estimation in uplink TDS-OFDMA is proposed using perfect sequence. ...
doi:10.1515/eletel-2016-0030
fatcat:hrevzotw5jadrcov3i5y6nrk64
Low-Complexity Orthogonal Spectral Signal Construction for Generalized OFDMA Uplink With Frequency Synchronization Errors
2007
IEEE Transactions on Vehicular Technology
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
In an unsynchronized OFDMA uplink, each user has a different carrier frequency offset (CFO) relative to the common uplink receiver, which results in the loss of orthogonality among subcarriers and thereby ...
The interference in the generalized OFDMA uplink due to frequency synchronization errors is characterized in a multiuser signal model. ...
ACKNOWLEDGMENT The authors would like to thank the reviewers and the editor of this paper for their valuable comments and suggestions. ...
doi:10.1109/tvt.2007.895601
fatcat:ech4groprjdpjoz2sayvmgqjry
Comparison of OFDMA and GFDMA for Next-Generation PONs
2017
Journal of Optical Communications and Networking
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
Moreover, two methods are proposed for achieving synchronization in the uplink channel of PONs, enabling high spectral efficiency. ...
This paper examines and compares the use of orthogonal frequency division multiple access (OFDMA) and generalized frequency division multiple access (GFDMA) multicarrier formats in next-generation passive ...
ACKNOWLEDGMENT This work has been jointly supported through CONNECT (13/RC/2077) and IPIC (12/RC/2276) research grants. ...
doi:10.1364/jocn.9.001064
fatcat:gnkaszi3qzgs3phyknagwoccxq
Deterministic Multiuser Carrier-Frequency Offset Estimation for Interleaved OFDMA Uplink
2004
IEEE Transactions on Communications
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2013; you can also visit the original URL.
The file type is application/pdf.
This paper exploits the inner structure of the signals for CFO estimation in the uplink of interleaved OFDMA systems. ...
A new uplink signal model is presented, and an estimation algorithm based on the signal structure is proposed for estimating the CFOs of all users using only one OFDMA block. ...
ACKNOWLEDGMENT The authors would like to thank the reviewers and the paper editor for their valuable comments and suggestions. ...
doi:10.1109/tcomm.2004.833183
fatcat:j2o6nzi24rbjncguoet7usvsjm
Synchronization Techniques for Orthogonal Frequency Division Multiple Access (OFDMA): A Tutorial Review
2007
Proceedings of the IEEE
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2012; you can also visit the original URL.
The file type is application/pdf.
This paper provides a comprehensive survey of the latest results in the field of synchronization for OFDMA systems, and the authors have endeavored to include ample tutorial content. ...
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. ...
Section III quantifies the effects of timing and frequency synchronization errors on the performance of an OFDMA system. ...
doi:10.1109/jproc.2007.897979
fatcat:yclaxa734nd75l7v6ore6drzkq
Robust OFDMA Uplink Synchronization by Exploiting the Variance of Carrier Frequency Offsets
2008
IEEE Transactions on Vehicular Technology
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
For an OFDMA uplink, we model the frequency offset for each user as an independent and identically distributed (i.i.d.) random variable with mean zero and variance σ 2 . ...
In this paper, the uplink frequency offset estimation for orthogonal frequency-division multiplexing access (OFDMA) is discussed. ...
A reliable one-block OFDMA uplink synchronization algorithm is proposed in [3] . An uplink timing and frequency synchronization method for an OFDMA system is proposed in [2] . ...
doi:10.1109/tvt.2007.912596
fatcat:2um4ldvv7bfazig5onyjkixb7u
Time and Frequency Synchronization for OFDMA Uplink System using the SAGE Algorithm
2007
IEEE Transactions on Wireless Communications
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
In this letter, we propose an iterative time and frequency synchronization scheme for orthogonal frequencydivision multiple access (OFDMA) uplink system using the space-alternating generalized expectation-maximization ...
Then, the maximization step is utilized in the timing and frequency offset estimation of each asynchronous user using the MAI-canceled signals. ...
ACKNOWLEDGMENT The authors would like to thank the paper editor and the reviewers for their valuable comments and suggestions. ...
doi:10.1109/twc.2007.348309
fatcat:5y2kdbar2rhnvhovitaui22b5y
A COMPREHENSIVE REVIEW OF MODULATION TECHNIQUES USED IN LONG TERM EVOLUTION
2015
Journal on Today s Ideas-Tomorrow s Technologies
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2022; you can also visit the original URL.
The file type is application/pdf.
Design of wireless communication system has been an important and challenging problem due to the nature of wireless channel. There are number of factors involved in the performance of a LTE system. ...
Orthogonal Frequency Division multiple access (OFDma) and Single Carrier Frequency Division multiple access (SC-FDma) are a dominant part of future mobile communication. ...
The PraCH channel performs uplink timing and frequency synchronization. This is performed by user equipment after downlink synchronization. Zadoff Chu (ZC) sequence is used because of its properties. ...
doi:10.15415/jotitt.2015.31006
fatcat:dvj3bfu5lzgbjerqxxdrnevjva
Blind Carrier Frequency Synchronization for the Uplink of Interleaved OFDMA Systems
2008
IEICE transactions on communications
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
In this letter, a novel blind CFO estimation algorithm for the uplink of an OFDMA system is proposed. ...
Therefore, the proposed estimator can be applied to OFDMA systems with an arbitrary subcarrier assignment over the entire bandwidth, including IEEE 802.16e, to obtain sufficient frequency diversity in ...
Acknowledgments This work was supported by the MIC (Ministry of Information and Communication), Korea, under the ITRC (Information Technology Research Center) support program supervised by the IITA (Institute ...
doi:10.1093/ietcom/e91-b.1.368
fatcat:q5hssy7gtveonnoi2lbziktxbm
Maximum-likelihood synchronization and channel estimation for OFDMA uplink transmissions
2006
IEEE Transactions on Communications
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2006; you can also visit the original URL.
The file type is application/pdf.
Maximum-likelihood estimation of the carrier frequency offset (CFO), timing error, and channel response of each active user in the uplink of an orthogonal frequency-division multiple-access system is investigated ...
This results in an estimation algorithm of a reasonable complexity which is suitable for practical applications. ...
The above synchronization and channel estimation tasks are particularly challenging in the uplink of an OFDMA system where each user has his/her own CFO, timing error, and channel response. ...
doi:10.1109/tcomm.2006.873093
fatcat:cxdi4vejzrg7rjyfjrflluc4h4
A joint ML estimation technique for timing, CFO and channel for OFDMA uplink transmissions
2011
2011 National Conference on Communications (NCC)
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
This paper addresses the issue of joint maximumlikelihood (ML) estimation of carrier frequency offset (CFO), timing error and channel response for OFDMA uplink transmissions. ...
Index Terms-Orthogonal frequency division multiple access (OFDMA), channel estimation, frequency synchronization, timing synchronization, maximum likelihood estimation (MLE) . ...
an OFDMA system. ...
doi:10.1109/ncc.2011.5734722
fatcat:ez4mjjtzsfbnzpki554qybrrxe
SAGE based iterative receiver for joint synchronization and channel estimation in uplink MIMO-OFDMA systems
2008
Journal of China Universities of Posts and Telecommunications
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
A new Turbo iterative receiver structure is proposed for the uplink multiple-input multiple-output orthogonal frequency division multiple access (MIMO-OFDMA) systems. ...
(i.e., timing offset, carrier frequency offset, channel state information, etc.) sequentially for each user. ...
[4, 5] evolves the SAGE algorithm into timing and frequency synchronization for OFDMA uplink system, but the multiple-antenna technology is not considered. ...
doi:10.1016/s1005-8885(08)60115-6
fatcat:4dvxcf2qbbbxlmosw2btzm2rta
Efficient CFO Compensation Method in Uplink OFDMA for Mobile WiMax
2016
Journal of ICT Research and Applications
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
Mobile WiMax uses Orthogonal Frequency Division Multiple Access (OFDMA) in uplink where synchronization is a complex task as each user presents a different carrier frequency offset (CFO). ...
The difference between the CFOs of two OFDMA symbols lies within the range of RFO that is not considered in the conventional compensation techniques, such as the SI-MUIC, DC-SC and IEC compensation techniques ...
Conclusion In this paper, an efficient CFO compensation technique in uplink OFDMA for mobile WiMAX was proposed. ...
doi:10.5614/itbj.ict.res.appl.2016.10.2.4
fatcat:klwejxvadzacld4ymax4q6gcpq
Iterative Equalization and Decoding for Unsynchronized OFDMA Uplink Transmissions
2006
IEEE Vehicular Technology Conference
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2010; you can also visit the original URL.
The file type is application/pdf.
For the uplink transmission of a coded OFDMA system, we present an iterative receiver that performs joint frequency offset acquisition, channel estimation and maximum a posteriori (MAP)-based decoding ...
Simulations indicate that the proposed scheme provides accurate decoding for unsynchronized OFDMA uplink transmissions over frequency-selective fading channels. ...
Two critical issues in the design of an OFDMA uplink system are frequency synchronization and channel estimation. ...
doi:10.1109/vtcf.2006.189
dblp:conf/vtc/PunMK06
fatcat:6aeixxhynraezf4xgwlaaa7hjm
« Previous
Showing results 1 — 15 out of 2,417 results