Time-domain IQ mismatch compensator with frequency-domain observations
AssigneeSamsung Electronics Co., Ltd.
InventorsElina Nayebi, Pranav Dayal, Kee-Bong Song
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Abstract
A system, method, and electronic device for compensating in-phase (I) and quadrature (Q) mismatch (IQMM) are herein disclosed. The system includes an IQ mismatch compensator (IQMC) configured to compensate for IQMM between a time-domain I signal and a time-domain Q signal using filter weight coefficients, and output a compensated I signal and a compensated Q signal, a fast Fourier transformation (FFT) circuit configured to perform an FFT on the compensated I signal and the compensated Q signal to a frequency-domain compensated signal, and a coefficient updater configured to update the filter weight coefficients based on a frequency-domain observation of the frequency-domain compensated signal.
Claims20
A system for compensating in-phase (I) and quadrature (Q) mismatch (IQMM), comprising:
- an IQ mismatch compensator (IQMC) configured to:
- compensate for IQMM in a time domain using filter weight coefficients;
- and
- output a compensated I signal and a compensated Q signal;
- a fast Fourier transformation (FFT) circuit configured to perform an FFT on the compensated I signal and the compensated Q signal to a frequency-domain compensated signal;
- and
- a coefficient updater configured to update the filter weight coefficients that are determined based on a gradient of a cost function of a frequency-domain observation.
A method for compensating in-phase (I) and quadrature (Q) mismatch (IQMM), comprising:
- compensating, with an IQ mismatch compensator (IQMC), for IQMM in a time domain, using filter weight coefficients;
- outputting, with the IQMC, a compensated I signal and a compensated Q signal;
- transforming, with a fast Fourier transformation (FFT) circuit, the compensated I signal and the compensated Q signal to a frequency-domain compensated signal;
- and
- updating, with a coefficient updater, the filter weight coefficients that are determined based on a gradient of a cost function of a frequency-domain observation.
A method for compensating in-phase (I) and quadrature (Q) mismatch (IQMM), comprising:
- compensating, with an IQ mismatch compensator (IQMC), for IQMM in a time domain, using filter weight coefficients;
- outputting, with the IQMC, a compensated I signal and a compensated Q signal;
- transforming, with a fast Fourier transformation (FFT) circuit, the compensated I signal and the compensated Q signal to a frequency-domain compensated signal;
- and
- updating, with a coefficient updater, the filter weight coefficients based on a gradient descent algorithm applying a gradient of a cost function.
Dependencies are inferred from the claim text.