Method and apparatus for performing run-time compensation of I/Q mismatch in a baseband signal

摘要

A downconversion downconverts a received signal. The downconverted signal includes IQ mismatch. A compensation module generates a compensated signal based on (i) the downconverted signal and (ii) an IQ mismatch compensation value. First and second mixers mix the compensated withal with first and second oscillating signals, respectively. First and second Fast Fourier Transform (FFT) modules perform FFTs on outputs of the first and second mixers to generate a first and second FFT signals, respectively. An IQ mismatch estimation module captures portions of the first and second FFT signals generated in response to the received signal including a first and second predetermined sequences. The IQ mismatch estimation module generates the IQ mismatch compensation value based on: the portions of the first and second FFT signals; the first predetermined sequence; and the second predetermined sequence.

主权项

1. A receiver comprising:
a downconversion module configured to (i) receive a signal and (ii) downconvert the signal to generate a downconverted signal, wherein the downconverted signal includes in-phase/quadrature (IQ) mismatch; a compensation module configured to generate a compensated signal based on (i) the downconverted signal and (ii) an IQ mismatch compensation value; a first mixer configured to mix the compensated signal with a first oscillating signal generated by a local oscillator to shift a frequency of the compensated signal; a second mixer configured to mix the compensated signal with a second oscillating signal to shift a frequency of the compensated signal; a first Fast Fourier Transform (FFT) module configured to perform a FFT on an output of the first mixer to generate a first FFT signal; a second FFT module configured to perform a FFT on an output of the second mixer to generate a second FFT signal; and an IQ mismatch estimation module configured to
capture a first portion of the first FFT signal and a second portion of the first FFT signal generated in response to the received signal including a first predetermined sequence and a second predetermined sequence, respectively,capture a first portion of the second FFT signal and a second portion of the second FFT signal generated in response to the received signal including the first predetermined sequence and the second predetermined sequence, respectively, andgenerate the IQ mismatch compensation value based on: (i) the first portions of the first and second FFT signals; (ii) the second portions of the first and second FFT signals; (iii) the first predetermined sequence; and (iv) the second predetermined sequence.