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Antenna array calibration method and apparatus

  • US 10,644,813 B2
  • Filed: 03/11/2016
  • Issued: 05/05/2020
  • Est. Priority Date: 03/11/2016
  • Status: Active Grant
First Claim
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1. A time domain calibration method to compensate for signal impairment in transmit paths in a transmitter configured to drive an antenna array, the method comprising:

  • receiving a feedback signal formed from a combination of a plurality of outbound signals couple-able to a plurality of antenna ports;

    capturing at least one outbound signal as a reference signal before the at least one outbound signal is input to a transmit path;

    performing an impairment estimate based on the at least one reference signal and the feedback signal;

    wherein performing the impairment estimate includes implementing a conjugate gradient method to produce an impairment vector, H, the impairment vector H usable to determine the phase compensation;

    determining a phase compensation from the impairment estimate for each of the at least one outbound traffic signal; and

    applying the phase compensation to a respective one of the at least one outbound traffic signal before the at least one outbound traffic signal is input to the transmit path and before the at least one outbound traffic signal is captured to form the at least one reference signal.

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