Synchronization Techniques for Orthogonal Frequency Division Multiple Access (OFDMA): A Tutorial Review
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...
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| Veröffentlicht in: | Proceedings of the IEEE 2007-07, Vol.95 (7), p.1394-1427 |
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| description | 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. Synchronization represents one of the most challenging issues and plays a major role in the physical layer design. The goal of this paper is to provide a comprehensive survey of the latest results in the field of synchronization for OFDMA systems, with tutorial objectives foremost. After quantifying the effects of synchronization errors on the system performance, we review some common methods to achieve timing and frequency alignment in a downlink transmission. We then consider the uplink case, where synchronization is made particularly difficult by the fact that each user's signal is characterized by different timing and frequency errors, and the base station has thus to estimate a relatively large number of unknown parameters. A second difficulty is related to how the estimated parameters must be employed to correct the uplink timing and frequency errors. The paper concludes with a comparison of the reviewed synchronization schemes in an OFDMA scenario inspired by the IEEE 802.16 standard for wireless metropolitan area networks. |
| doi_str_mv | 10.1109/JPROC.2007.897979 |
| format | Article |
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Jay ; Pun, Man-On</creator><creatorcontrib>Morelli, Michele ; Kuo, C.-C. Jay ; Pun, Man-On</creatorcontrib><description>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. Synchronization represents one of the most challenging issues and plays a major role in the physical layer design. The goal of this paper is to provide a comprehensive survey of the latest results in the field of synchronization for OFDMA systems, with tutorial objectives foremost. After quantifying the effects of synchronization errors on the system performance, we review some common methods to achieve timing and frequency alignment in a downlink transmission. We then consider the uplink case, where synchronization is made particularly difficult by the fact that each user's signal is characterized by different timing and frequency errors, and the base station has thus to estimate a relatively large number of unknown parameters. A second difficulty is related to how the estimated parameters must be employed to correct the uplink timing and frequency errors. 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Jay</creatorcontrib><creatorcontrib>Pun, Man-On</creatorcontrib><title>Synchronization Techniques for Orthogonal Frequency Division Multiple Access (OFDMA): A Tutorial Review</title><title>Proceedings of the IEEE</title><addtitle>JPROC</addtitle><description>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. Synchronization represents one of the most challenging issues and plays a major role in the physical layer design. The goal of this paper is to provide a comprehensive survey of the latest results in the field of synchronization for OFDMA systems, with tutorial objectives foremost. 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Jay</creator><creator>Pun, Man-On</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>97E</scope><scope>RIA</scope><scope>RIE</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>8FD</scope><scope>L7M</scope><scope>F28</scope><scope>FR3</scope></search><sort><creationdate>20070701</creationdate><title>Synchronization Techniques for Orthogonal Frequency Division Multiple Access (OFDMA): A Tutorial Review</title><author>Morelli, Michele ; Kuo, C.-C. Jay ; Pun, Man-On</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c519t-8e41145c04a913bea42957ee7a166ea0bd64e0cde40a47a0260d5f6991b9117c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Applied sciences</topic><topic>Base stations</topic><topic>Design engineering</topic><topic>Detection, estimation, filtering, equalization, prediction</topic><topic>Downlink</topic><topic>Downlink synchronization</topic><topic>dynamic subcarrier assignment</topic><topic>Errors</topic><topic>Exact sciences and technology</topic><topic>Frequency conversion</topic><topic>frequency correction</topic><topic>Frequency division multiple access</topic><topic>Frequency estimation</topic><topic>Frequency synchronization</topic><topic>Information, signal and communications theory</topic><topic>interblock interference (IBI)</topic><topic>interchannel interference (ICI)</topic><topic>interference cancellation</topic><topic>least square estimation</topic><topic>maximum likelihood estimation</topic><topic>Modulation, demodulation</topic><topic>multicarrier modulation</topic><topic>multiple access interference (MAI)</topic><topic>Multiplexing</topic><topic>multiuser detection</topic><topic>orthogonal frequency division multiple access (OFDMA)</topic><topic>orthogonal frequency division multiplexing (OFDM)</topic><topic>Parameter estimation</topic><topic>Physical layer</topic><topic>quasi-synchronous systems</topic><topic>Signal and communications theory</topic><topic>Signal, noise</topic><topic>Stations</topic><topic>subspace-based estimation</topic><topic>Synchronism</topic><topic>Synchronization</topic><topic>System performance</topic><topic>Systems, networks and services of telecommunications</topic><topic>Telecommunications</topic><topic>Telecommunications and information theory</topic><topic>Time measurements</topic><topic>Timing</topic><topic>timing correction</topic><topic>timing estimation</topic><topic>Transmission and modulation (techniques and equipments)</topic><topic>Tutorial</topic><topic>uplink synchronization</topic><topic>Wireless communications</topic><topic>wireless local area networks (WLANs)</topic><topic>wireless metropolitan area networks (WMANs)</topic><topic>Wireless networks</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Morelli, Michele</creatorcontrib><creatorcontrib>Kuo, C.-C. 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Jay</au><au>Pun, Man-On</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Synchronization Techniques for Orthogonal Frequency Division Multiple Access (OFDMA): A Tutorial Review</atitle><jtitle>Proceedings of the IEEE</jtitle><stitle>JPROC</stitle><date>2007-07-01</date><risdate>2007</risdate><volume>95</volume><issue>7</issue><spage>1394</spage><epage>1427</epage><pages>1394-1427</pages><issn>0018-9219</issn><eissn>1558-2256</eissn><coden>IEEPAD</coden><abstract>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. Synchronization represents one of the most challenging issues and plays a major role in the physical layer design. The goal of this paper is to provide a comprehensive survey of the latest results in the field of synchronization for OFDMA systems, with tutorial objectives foremost. After quantifying the effects of synchronization errors on the system performance, we review some common methods to achieve timing and frequency alignment in a downlink transmission. We then consider the uplink case, where synchronization is made particularly difficult by the fact that each user's signal is characterized by different timing and frequency errors, and the base station has thus to estimate a relatively large number of unknown parameters. A second difficulty is related to how the estimated parameters must be employed to correct the uplink timing and frequency errors. 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| subjects | Applied sciences Base stations Design engineering Detection, estimation, filtering, equalization, prediction Downlink Downlink synchronization dynamic subcarrier assignment Errors Exact sciences and technology Frequency conversion frequency correction Frequency division multiple access Frequency estimation Frequency synchronization Information, signal and communications theory interblock interference (IBI) interchannel interference (ICI) interference cancellation least square estimation maximum likelihood estimation Modulation, demodulation multicarrier modulation multiple access interference (MAI) Multiplexing multiuser detection orthogonal frequency division multiple access (OFDMA) orthogonal frequency division multiplexing (OFDM) Parameter estimation Physical layer quasi-synchronous systems Signal and communications theory Signal, noise Stations subspace-based estimation Synchronism Synchronization System performance Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Time measurements Timing timing correction timing estimation Transmission and modulation (techniques and equipments) Tutorial uplink synchronization Wireless communications wireless local area networks (WLANs) wireless metropolitan area networks (WMANs) Wireless networks |
| title | Synchronization Techniques for Orthogonal Frequency Division Multiple Access (OFDMA): A Tutorial Review |
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