FEEDBACK BASED INDOOR LOCALIZATION USING DIGITAL OFF-AIR ACCESS UNITS
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Abstract
A system for indoor localization using satellite navigation signals in a Distributed Antenna System includes a plurality of Off-Air Access Units (OAAUs). Each of the plurality of OAAUs is operable to receive an individual satellite navigation signal from at least one of a plurality of satellites and operable to route signals optically to one or more DAUs. The system also includes a plurality of remote DRUs located at a remote location. The plurality of remote DRUs are operable to receive signals from a plurality of local DAUs. The system further includes an algorithm to delay each individual satellite navigation signal for providing indoor localization at each of the plurality of DRUs and a GPS receiver at the remote location used in a feedback loop with the DRU to control the delays.
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Citations
20 Claims
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1. (canceled)
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2. A method for providing feedback in a distributed antenna system, the method comprising:
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transmitting, by a remote unit, one or more delayed satellite navigation radio frequency (RF) signals; receiving, by a remote satellite navigation system receiver, the one or more delayed satellite navigation RF signals; calculating, by the remote satellite navigation system receiver, a measured geographic position corresponding to the one or more delayed satellite navigation RF signals; transmitting, by the remote satellite navigation system receiver, the measured geographic position; receiving, by a feedback system, the measured geographic position; and updating, by the feedback system, a calculated delay based on the measured geographic position. - View Dependent Claims (3, 4)
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5. A method for performing indoor localization using satellite navigation signals in a Distributed Antenna System, the method comprising:
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receiving at each of a plurality of Off-Air Access Units (OAAUs) an individual satellite navigation signal from at least one of a plurality of satellites; routing signals from the plurality of OAAUs to a plurality of Digital Remote Units (DRUs) located at a remote location; delaying each individual satellite navigation signal, wherein each of the plurality of DRUs transmits one or more delayed satellite navigation signals; receiving at a satellite navigation system receiver at the remote location the one or more delayed satellite navigation signals; and transmitting a measured position from the satellite navigation system receiver to a feedback system. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method for indoor localization using global positioning system (GPS) signals in a Distributed Antenna System, the method comprising:
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receiving at each of a plurality of Multiple Input Off-Air Access Units (MIOAAUs) a GPS signal from at least one of a plurality of GPS satellites; routing signals from the plurality of MIOAAUs to one or more of the plurality of MIOAAUs; routing signals from at least one of the plurality MIOAAUs to a plurality of digital remote units (DRUs) located at a remote location; delaying, by at least one of the plurality of DRUs, each GPS signal; transmitting, by the at least one of the plurality of DRUs, the delayed GPS signals; receiving, by a GPS receiver at the remote location, the delayed GPS signals; and transmitting a measured position from the GPS receiver to a feedback system. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification