Remote radio head calibration
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments herein describe calibrating a plurality of radio heads having a plurality of wireless antennas. In one embodiment, the plurality of radio heads communicate a calibration signal in a round robin fashion such that each of the radio heads communicates a respective calibration signal to the remaining radio heads. In one embodiment, at least one of the radio heads is isolated from the remaining radio heads. The received calibration signals are then used to calibrate the radio heads. In one embodiment, a controller coupled with the plurality of radio heads calibrates the radio heads. The calibrated radio heads then communicate to one or more client devices.
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Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system, comprising:
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a processor; and a memory comprising instructions which, when executed on the processor, performs an operation 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 operation 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. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A computer program product 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 computer program product comprising a non-transitory computer-readable medium program having program instructions embodied therewith, the program instructions executable by a processor to perform an operation comprising:
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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. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification