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dc.contributor.authorLi, Wei
dc.contributor.authorZhang, Yue
dc.contributor.authorHuang, Li-Ke
dc.contributor.authorCosmas, John
dc.contributor.authorMaple, Carsten
dc.contributor.authorXiong, Jian
dc.date.accessioned2020-07-29T10:22:20Z
dc.date.available2020-07-29T10:22:20Z
dc.date.issued2015-09-25
dc.identifier.citationLi W, Zhang Y, Huang L, Cosmas J, Maple C, Xiong J (2015) 'Self-IQ-demodulation based compensation scheme of frequency-dependent IQ imbalance for wideband direct-conversion transmitters', IEEE Transactions on Broadcasting, 61 (4), pp.666-673.en_US
dc.identifier.issn0018-9316
dc.identifier.doi10.1109/TBC.2015.2465138
dc.identifier.urihttp://hdl.handle.net/10547/624301
dc.description.abstractA low cost frequency-dependent (FD) I/Q imbalance self-compensation scheme is investigated in this paper. The direct conversion transmitters are widely used in wireless systems. However, the unwanted image-frequencies and distortions are inevitably introduced into the direct conversion system. This problem is even severer in wideband systems. Therefore, the accurate estimation and compensation of I/Q imbalance is crucial. The current compensation method is based on external instruments or internal feedback path which introduces additional impairments and is expensive. This paper proposes a low cost FD I/Q imbalance self-IQ-demodulation based compensation scheme without using external calibration instruments. First, the impairments of baseband and RF components are investigated. Further, I/Q imbalance model is developed. Then, the proposed two-step self-IQ-demodulation based compensation scheme is investigated. In the first step of the scheme, the local oscillator (LO) related I/Q impairments parameters are estimated. Then in the second step, the overall FD I/Q imbalance parameters are estimated by utilizing the transmitter LO. To realize this self-IQ-demodulation algorithm, this paper introduces minor modifications to the current power detector circuit. Afterwards, the estimated parameters are applied to the baseband equivalent compensator. This sophisticated algorithm guarantees low computation complexity and low cost. The compensation performance is evaluated in laboratory measurement.en_US
dc.language.isoenen_US
dc.publisherInstitute of Electrical and Electronics Engineers Inc.en_US
dc.relation.urlhttps://ieeexplore.ieee.org/document/7277012en_US
dc.rightsGreen - can archive pre-print and post-print or publisher's version/PDF
dc.subjectdirect conversion transmittersen_US
dc.subjectimage-frequency interferenceen_US
dc.subjectRFen_US
dc.subjectIQ imbalanceen_US
dc.subjectautomatic calibrationen_US
dc.subjectLOen_US
dc.titleSelf-IQ-demodulation based compensation scheme of frequency-dependent IQ imbalance for wideband direct-conversion transmittersen_US
dc.typeArticleen_US
dc.contributor.departmentCobham Wirelessen_US
dc.contributor.departmentUniversity of Bedfordshireen_US
dc.contributor.departmentBrunel Universityen_US
dc.contributor.departmentUniversity of Warwicken_US
dc.contributor.departmentShanghai Jiao Tong Universityen_US
dc.identifier.journalIEEE Transactions on Broadcastingen_US
dc.date.updated2020-07-29T10:18:05Z
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