Frequency offset and I/Q imbalance compensation for direct-conversion receivers

  title={Frequency offset and I/Q imbalance compensation for direct-conversion receivers},
  author={Guanbin Xing and Manyuan Shen and Hui Liu},
  journal={IEEE Transactions on Wireless Communications},
Two types of wireless system imperfections, namely, frequency offset and in-phase/quadrature (I/Q) imbalance, are addressed in this paper. The I/Q imbalance in radio frequency (RF) direct-conversion not only introduces an unwanted in-band image interference but also degrades the accuracy of carrier estimation. Toward this end, we propose a pilot-based scheme for both frequency offset and I/Q imbalance compensation at the baseband. A low-cost nonlinear least squares (NLS) frequency estimator… CONTINUE READING
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