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Remote radio head calibration

  • US 9,991,972 B1
  • Filed: 04/26/2017
  • Issued: 06/05/2018
  • Est. Priority Date: 04/26/2017
  • Status: Active Grant
First Claim
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1. A method for calibrating a first radio head and a second radio head, wherein the first radio head and the second radio head each comprises a respective plurality of antennas, the method comprising:

  • transmitting, via the plurality of antennas of the first radio head, a first calibration signal to the second radio head;

    upon determining the first radio head is isolated from the second radio head, re-transmitting the first calibration signal via beamforming of the plurality of antennas of the first radio head;

    receiving the re-transmitted calibration signal using the plurality of antennas of the second radio head;

    transmitting, via the plurality of antennas of the second radio head, a second calibration signal to the first radio head; and

    calibrating the first radio head and the second radio head based on a calibration vector determined from the first and second calibration signals received at the respective plurality of antennas of the first radio head and the second radio head.

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