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    Self-IQ-demodulation based compensation scheme of frequency-dependent IQ imbalance for wideband direct-conversion transmitters

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    Authors
    Li, Wei
    Zhang, Yue
    Huang, Li-Ke
    Cosmas, John
    Maple, Carsten
    Xiong, Jian
    Affiliation
    Cobham Wireless
    University of Bedfordshire
    Brunel University
    University of Warwick
    Shanghai Jiao Tong University
    Issue Date
    2015-09-25
    Subjects
    direct conversion transmitters
    image-frequency interference
    RF
    IQ imbalance
    automatic calibration
    LO
    
    Metadata
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    Abstract
    A 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.
    Citation
    Li 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.
    Publisher
    Institute of Electrical and Electronics Engineers Inc.
    Journal
    IEEE Transactions on Broadcasting
    URI
    http://hdl.handle.net/10547/624301
    DOI
    10.1109/TBC.2015.2465138
    Additional Links
    https://ieeexplore.ieee.org/document/7277012
    Type
    Article
    Language
    en
    ISSN
    0018-9316
    ae974a485f413a2113503eed53cd6c53
    10.1109/TBC.2015.2465138
    Scopus Count
    Collections
    Computing

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