Feedback based indoor localization using digital off-air access units

1. A system for indoor localization using satellite navigation signals in a Distributed Antenna System, the system comprising:

a plurality of Off-Air Access Units (OAAUs), each of the plurality of OAAUs 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 digital access units (DAUs);

a plurality of remote digital remote units (DRUs) located at a remote location, wherein the plurality of remote DRUs are operable to receive signals from a plurality of local DAUs;

an algorithm to delay each individual satellite navigation signal for providing indoor localization at each of the plurality of DRUs; and

a global positioning system (GPS) receiver at the remote location used in a feedback loop with the DRU to control the delays.

2. The system of claim 1 wherein the satellite navigation signal comprises at least one of a GPS, Global Navigation Satellite System (GLONASS), Galileo, Quasi-Zenith Satellite System (QZSS), or BeiDou signal.

3. The system of claim 1 wherein the plurality of satellites are at least one of GPS, Global Navigation Satellite System (GLONASS), Galileo, Quasi-Zenith Satellite System (QZSS), or BeiDou satellites.

4. The system of claim 1 wherein the plurality of local DAUs are coupled via at least one of a Ethernet cable, Optical Fiber, or Wireless Link.

5. The system of claim 1 wherein the plurality of OAAUs are connected to a plurality of DAUs via at least one of Ethernet cable, Optical Fiber, or Wireless Link.

6. A system for indoor localization using GPS signals in a Distributed Antenna System, the system comprising:

a plurality of Off-Air Access Units (OAAUs) connected together via a daisy chain configuration and operable to receive a global positioning system (GPS) signal from at least one of a plurality of GPS satellites, and operable to route signals optically to one or more digital access units (DAUs);

a plurality of remote digital remote units (DRUs) located at a remote location, wherein the plurality of remote DRUs are operable to receive signals from at least one of the one or more DAUs;

an algorithm to delay the GPS signals received at the plurality of OAAUs for providing indoor localization at each of the plurality of remote DRUs; and

a GPS receiver at the remote location used in a feedback loop with the plurality of remote DRUs to control the delays.

7. The system of claim 6 wherein the plurality of Off-Air Access Units (OAAUs) are coupled via at least one of Ethernet cable, Optical Fiber, or Wireless Link.

8. A system for indoor localization using global positioning system (GPS) signals in a Distributed Antenna System, the system comprising:

a plurality of Multiple Input Off-Air Access Units (OAAUs), receiving a GPS signal from at least one of a plurality of GPS satellites and operable to route signals optically to one or more digital access units (DAUs);

a plurality of remote digital remote units (DRUs) located at a remote location, wherein the plurality of remote DRUs are operable to receive signals from one or more of the one or more DAUs;

an algorithm to delay each individual GPS satellite 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.

9. The system of claim 8 wherein the GPS receiver is associated with one of the plurality of remote DRUs.

10. The system of claim 8 wherein the GPS receiver is associated with all of the plurality of remote DRUs.