Manifold calibration for a communication system
AssigneeMotorola, Inc.
InventorsTimothy A. Thomas, Frederick W. Vook
Life of this patent
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Abstract
A method and apparatus for determining stream weights is provided herein. During operation, an uplink direction of arrival (DOA) and a downlink direction of departure (DOD) calibration procedure is implemented using uplink signals and GPS information from a subset of mobiles without the need of calibration circuitry at the base. Because the presented calibration procedure needs no new hardware it can be deployed in existing deployments with only a soft-ware upgrade.
Claims20
A method for performing direction of arrival (DOA) manifold calibration, the method comprising the steps of:
- determining by a base station, an angle θ to a mobile unit, wherein the determination is made by a technique other than determining a direction of a signal received from the mobile unit;
- receiving by the base station, an uplink transmission (Y(k,b)) from the mobile unit;
- determining, by the base station, a dominant vector r(b) from the received uplink transmission;
- computing, by the base station, calibration coefficients C(b) based on the angle θ and r(b);
- and
- applying, by the base station, the calibration coefficients to received uplink transmissions.
A method for performing direction of departure (DOD) manifold calibration, the method comprising the steps of:
- determining by a base station, an angle θ to a mobile unit, wherein the determination is made by a technique other than determining a direction of a signal received from the mobile unit;
- receiving by the base station, feedback from the mobile unit regarding a dominant downlink vector r(b);
- determining, by the base station, calibration coefficients D based on the angle θ and dominant downlink vector r(b);
- and
- applying, by the base station, the calibration coefficients to downlink transmissions to the mobile unit.
An apparatus for performing direction of arrival (DOA) manifold calibration, the apparatus comprising:
- calibration circuitry having as an input, information on an angle θ to a mobile unit, an uplink transmission (Y(k,b)) from a mobile unit, the calibration circuitry determining a dominant vector r(b) from the received uplink transmission, the calibration circuitry outputting calibration coefficients C(b) based on the angle θ and r(b);
- and
- multiplication circuitry applying the calibration coefficients to received uplink transmissions.
An apparatus for performing direction of departure (DOD) manifold calibration, the apparatus comprising:
- calibration circuitry receiving information on an angle θ to a mobile unit and receiving vector feedback from the mobile unit regarding a dominant downlink vector r(b), the calibration circuitry outputting calibration coefficients D based on the angle θ and dominant downlink vector r(b);
- and
- multiplication circuitry applying the calibration coefficients to downlink transmissions to the mobile unit.
Dependencies are inferred from the claim text.