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Method and appatatus for I/Q mismatch calibration of transmitter

  • US 20050041754A1
  • Filed: 08/21/2003
  • Published: 02/24/2005
  • Est. Priority Date: 08/21/2003
  • Status: Active Grant
First Claim
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1. A method for I/Q mismatch calibration of a transmitter, comprising the following steps:

  • generating a discrete-time signal x[n]=x(n·

    Ts), wherein x(t)=ej2π

    f
    Tt and fT and Ts are real numbers;

    obtaining a corrected signal xc[n] based on the signal x[n] and a set of correction parameters Ap and Bp, wherein xc[n]=Ap·

    x[n]+Bp·

    x*[n];

    converting the corrected signal xc[n] to an analog corrected signal xc(t);

    applying I/Q modulation to the analog corrected signal xc(t) and outputting a modulated signal xm(t);

    obtaining a first desired component measure W(1)(fT) and a first image component measure W(1)(−

    fT) from the modulated signal xm(t) with a first set of the correction parameters Ap and Bp;

    obtaining a second desired component measure W(2)(fT) and a second image component measure W(2)(−

    fT) from the modulated signal xm(t) with a second set of the correction parameters Ap and Bp;

    obtaining a third desired component measure W(3)(fT) and a third image component measure W(3)(−

    fT) from the modulated signal xm(t) with a third set of the correction parameters Ap and Bp;

    obtaining a fourth and fifth set of correction parameters Ap and Bp based on the first, the second, and the third desired component measures as well as the first, the second, and the third image component measures;

    obtaining a fourth desired component measure W(4)(fT) and a fourth image component measure W(4)(−

    fT) from the modulated signal xm(t) with the fourth set of correction parameters Ap and Bp;

    obtaining a fifth desired component measure W(5)(fT) and a fifth image component measure W(5)(−

    fT) from the modulated signal xm(t) with the fifth set of correction parameters Ap and Bp; and

    obtaining a final set of the correction parameters Ap and Bp from the fourth and fifth sets of correction parameters.

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