Remote radio head reciprocity calibration
AssigneeCisco Technology, Inc.
InventorsMithat C. DOGAN, Jiunming HUANG, Brian D. HART, Matthew A. SILVERMAN
Life of this patent
Estimating the term…
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. 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.
Claims20
A method for calibrating a first radio head and a second radio head, wherein the first radio head and the second radio head comprise 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, wherein the plurality of antennas of the second radio head receives the first calibration signal;
- transmitting, via the plurality of antennas of the second radio head, a second calibration signal to the first radio head, wherein the plurality of antennas of the first radio head receives the second calibration signal;
- and
- calibrating the first radio head and the second radio head based on a calibration vector determined from the calibration signals received at the respective plurality of antennas of the first radio head and the second radio head, wherein calibrating the first and second radio heads further comprises:
- determining a respective gain for each of the antennas of the first radio head and the second radio head;
- and
- determining a respective phase for each of the antennas of the first radio head and the second radio head.
(canceled)
A system, comprising:
- 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 comprise 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, wherein the plurality of antennas of the second radio head receives the first calibration signal;
- transmitting, via the plurality of antennas of the second radio head, a second calibration signal to the first radio head, wherein the plurality of antennas of the first radio head receives the second calibration signal;
- and
- calibrating the first radio head and the second radio head based on a calibration vector determined from the calibration signals received at the respective plurality of antennas of the first radio head and the second radio head, wherein calibrating the first and second radio heads further comprises:
- determining a respective gain for each of the antennas of the first radio head and the second radio head;
- and
- determining a respective phase for each of the antennas of the first radio head and the second radio head.
(canceled)
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 comprise a respective plurality of antennas, the computer program product comprising a non-transitory computer-readable medium having program instructions embodied therewith, the program instructions executable by a processor to perform an operation comprising:
- transmitting, via the plurality of antennas of the first radio head, a first calibration signal to the second radio head, wherein the plurality of antennas of the second radio head receives the first calibration signal;
- transmitting, via the plurality of antennas of the second radio head, a second calibration signal to the first radio head, wherein the plurality of antennas of the first radio head receives the second calibration signal;
- and
- calibrating the first radio head and the second radio head based on a calibration vector determined from the calibration signals received at the respective plurality of antennas of the first radio head and the second radio head, wherein calibrating the first and second radio heads further comprises:
- determining a respective gain for each of the antennas of the first radio head and the second radio head;
- and
- determining a respective phase for each of the antennas of the first radio head and the second radio head.
(canceled)
Dependencies are inferred from the claim text.