Patent ID: 8849602
Filing Date: 2014-09-30
Classification: G01R

Abstract:
1. A method of calibrating a reconstructed signal from a plurality of sub-signals, the method comprising: injecting a calibration signal into a received input signal, the calibration signal comprising a plurality of tones; dividing the input signal with the injected calibration signal into at least a first sub-signal having a first frequency band and a second sub-signal having a second frequency band, wherein a portion of the first frequency band overlaps a portion of the second frequency band to form an overlapping frequency band; performing a first frequency translation by converting frequency components of the second sub-signal within the second frequency band to obtain a frequency converted second sub-signal; digitizing the first sub-signal and the frequency converted second sub-signal; quantifying impairments to the first sub-signal and the second sub-signal caused by differences in magnitude and phase of frequency components of the first and second sub-signals within the overlapping frequency band; and performing a second frequency translation to reverse the first frequency translation by converting the frequency components of the digital frequency converted second sub-signal to the frequency components within the second frequency band to obtain a reconstructed second sub-signal, wherein quantifying the impairments comprises measuring relative magnitudes and phases of the plurality of tones of the calibration signal present in the digital first sub-signal and one of the frequency converted second sub-signal and the reconstructed second sub-signal.