Performance Analysis and Mitigation Techniques for I/Q-Corrupted OFDM Systems

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Oruthota, Udesh
dc.date.accessioned 2015-12-29T10:02:00Z
dc.date.available 2015-12-29T10:02:00Z
dc.date.issued 2015
dc.identifier.isbn 978-952-60-6596-0 (electronic)
dc.identifier.isbn 978-952-60-6595-3 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/19342
dc.description.abstract Orthogonal Frequency Division Multiplexing (OFDM) has become a widely adopted modulation technique in modern communications systems due to its multipath resilience and low implementation complexity. The direct conversion architecture is a popular candidate for low-cost, low-power, fully integrated transceiver designs. One of the inevitable problems associated with analog signal processing in direct conversion involves the mismatches in the gain and phases of In-phase (I) and Quadrature-phase (Q) branches. Ideally, the I and Q branches of the quadrature mixer will have perfectly matched gains and are orthogonal in phase. Due to imperfect implementation of the electronics, so called I/Q imbalance emerges and creates interference between subcarriers which are symmetrically apart from the central subcarrier. With practical imbalance levels, basic transceivers fail to maintain the sufficient image rejection, which in turn can cause interference with the desired transmission. Such an I/Q distortion degrades the systems performance if left uncompensated. Moreover, the coexistence of I/Q imbalance and other analog RF imperfections with digital baseband and higher layer functionalities such as multiantenna transmission and radio resource management, reduce the probability of successful transmission. Therefore, mitigation of I/Q imbalance is an essential substance in designing and implementing modern communications systems, while meeting required performance targets and quality of service. This thesis considers techniques to compensate and mitigate I/Q imbalance, when combined with channel estimation, multiantenna transmission, transmission power control, adaptive modulation and multiuser scheduling. The awareness of the quantitative relationship between transceiver parameters and system parameters is crucial in designing and dimensioning of modern communications systems. For this purpose, analytical models to evaluate the performance of an I/Q distorted system are considered. en
dc.format.extent 82 + app. 62
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 219/2015
dc.relation.haspart [Publication 1]: U. Oruthota, O. Tirkkonen. SER/BER expression for M-QAM OFDM systems with imperfect channel estimation and I/Q imbalance. EURASIP Journal onWireless Communications and Networking, 2012:303, September 2012. DOI:10.1186/1687-1499-2012-303
dc.relation.haspart [Publication 2]: U. Oruthota, O. Tirkkonen, and N. Y. Ermolova. Analysis of spacefrequency coded OFDM with I/Q imbalance. In Proceedings of the International Congress on Ultra Modern Telecommunications and Control Systems, ICUMT, pp. 275-280, October 2010.
dc.relation.haspart [Publication 3]: U. Oruthota, O. Tirkkonen. I/Q imbalance compensation in precoded MIMO-OFDMA systems. In Proceedings of the International Symposium on Wireless Personal Multimedia Communications, WPMC, pp. 291-295, September 2012.
dc.relation.haspart [Publication 4]: U. Oruthota, O. Tirkkonen. Link adaptation of precoded MIMO-OFDMA system with I/Q interference. IEEE Transactions on Communications, vol. 63, no. 3, pp. 780-790, March 2015. DOI: 10.1109/TCOMM.2015.2391180
dc.relation.haspart [Publication 5]: U. Oruthota, O. Tirkkonen. I/Q interference in device-to-device underlay communication with uplink power control. In Proceedings of the 81st IEEE Vehicular Technology Conference, VTC Spring, pp. 1-5, May 2015. DOI:10.1109/VTCSpring.2015.7145866
dc.subject.other Telecommunications engineering en
dc.title Performance Analysis and Mitigation Techniques for I/Q-Corrupted OFDM Systems en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.school School of Electrical Engineering en
dc.contributor.department Tietoliikenne- ja tietoverkkotekniikan laitos fi
dc.contributor.department Department of Communications and Networking en
dc.subject.keyword I/Q imbalance en
dc.subject.keyword performance analysis en
dc.subject.keyword channel estimation en
dc.subject.keyword MIMO en
dc.subject.keyword precoding en
dc.subject.keyword link adaptation en
dc.subject.keyword D2D communication en
dc.identifier.urn URN:ISBN:978-952-60-6596-0
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Tirkkonen, Olav, Prof., Aalto University, Department of Communications and Networking, Finland
dc.opn Svensson, Tommy, Prof., Chalmers University, Sweden
dc.rev Bengtsson, Mats, Prof., KTH Royal Institute of Technology, Sweden
dc.rev Matthaiou, Michail, Dr., Queen’s University, United Kingdom
dc.date.defence 2016-01-15


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