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    National Tsing Hua University Institutional Repository > 研究中心 > 電腦與通訊科技研發中心 > 技術報告 >  Estimation and compensation of I/Q imbalance in OFDM systems


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/13481


    Title: Estimation and compensation of I/Q imbalance in OFDM systems
    Authors: Kuang-Yu Sung
    Chi-chao Chao
    教師: 趙啟超
    Date: 2005
    Publisher: Institute of Electrical and Electronics Engineers Inc.
    Keywords: AWGN channels
    OFDM modulation
    channel estimation
    least squares approximations
    maximum likelihood estimation
    Abstract: In this paper, we propose two methods to compensate the I/Q imbalance generated by the direct conversion receiver in orthogonal frequency division multiplexing (OFDM) systems. In our proposed methods, the channel is considered to be an unknown multipath channel with additive white Gaussian noise. Two methods for I/Q imbalance compensation are proposed: the maximum-likelihood estimation (MLE)-based method and the least-square estimation (LSE)-based method. Computer simulations are conducted for comparisons of the performance. Effects of timing and frequency offsets on performance are also considered. We find that the MLE-based method generally performs well and is robust against timing and frequency offsets. The LSE-based method performs well at high signal-to-noise ratio and is robust against the timing offset.
    Relation Link: http://webservices.ieee.org/pindex_basic.html
    URI: http://nthur.lib.nthu.edu.tw/handle/987654321/13481
    Appears in Collections:[電腦與通訊科技研發中心] 技術報告
    [通訊工程研究所] 會議論文

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