Indoor localization using digital off-air access units
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 the one or more 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.
1. A system for indoor localization using satellite navigation signals in a Distributed Antenna System, the system comprising:
one or more Digital Access Units (DAUs);
a plurality of Off-Air Access Units (OAAUs), each of the plurality of OAAUs operable to receive an individual satellite navigation signal from one of a plurality of satellites and operable to route the individual satellite navigation signals optically to at least one of the one or more DAUs;
a plurality of remote Digital Remote Units (DRUs) located at a Remote location, wherein each of the plurality of remote DRUs is coupled to at least one of the one or more DAUs and is operable to:
receive a satellite navigation signal from the at least one of the one or more DAUs;
delay the received satellite navigation signal; and
transmit the delayed satellite navigation signal to a mobile device for providing indoor localization of the mobile device using the plurality of DRUs.
2. The system of claim 1 wherein the satellite navigation signal comprises at least one of a GPS, GLONASS, Galileo, QZSS, or BeiDou signal.
3. The system of claim 1 wherein the one or more DAUs are a plurality of DAUs coupled via at least one of a Ethernet cable, Optical Fiber, or Wireless Link.
4. The system of claim 1 wherein the plurality of OAAUs are connected to the one or more DAUs via at least one of Ethernet cable, Optical Fiber, or Wireless Link.
5. The system of claim 1 wherein the delayed satellite navigation signal is a function of a positional offset for each DRU.
6. The system of claim 5 wherein the positional offset is determined during installation using a set of blueprints for a venue.
7. The system of claim 1 further comprising a server coupled to the one or more DAUs.
8. The system of claim 7 wherein the server is operable to route a signal between the remote DRUs.
9. The system of claim 7 wherein the server is operable to store a set of configuration information for the DAUs, the OAAUs, and the DRUs.
10. The system of claim 9 wherein the set of configuration information includes a positional offset for each DRU.
11. The system of claim 1 wherein the one or more DAUs are configured to route a set of parameter changes to the OAAU.
12. The system of claim 1 wherein each of the plurality of OAAUs comprises a directional antenna operable to communicate with a distinct subset of the plurality of satellites.
13. The system of claim 1 wherein:
the OAAU is configured to:
convert the individual satellite navigation signal to a digital satellite navigation signal and route the digital satellite navigation signal through an optical cable to the one or more DAUs;
the one or more DAUs are configured to:
time multiplex the digital satellite navigation signal; and
route the multiplexed digital satellite navigation signal to the at least one of the plurality of remote DRUs; and
the at least one of the plurality of remote DRUs is configured to:
demultiplex the time multiplexed digital satellite navigation signal;
delay the digital satellite navigation signal;
convert the digital satellite navigation signal to an RF satellite navigation signal; and
transmit the RF satellite navigation signal.
14. The system of claim 1 wherein each of the plurality of remote DRUs is operable to transmit a combination of delayed satellite navigation signals.
15. The system of claim 1 wherein each of the plurality of DRUs transmits different delayed satellite navigation signals.
16. A system for indoor localization using GPS signals in a Distributed Antenna System, the system comprising:
one or more Digital Access Units (DAUs);
a plurality of Off-Air Access Units (OAAUs), connected together via a daisy chain configuration, and operable to receive a GPS satellite navigation signal transmitted by at least one of a plurality of GPS satellites, and operable to route the GPS satellite navigation signal optically to at least one of the one or more DAUs;
a plurality of remote Digital Remote Units (DRUs) located at a Remote location, wherein each of the plurality of remote DRUs are operable to:
receive a GPS satellite navigation signal from the at least one of the one or more DAUs;
delay the received GPS satellite navigation signal; and
transmit the delayed GPS satellite navigation signal for providing indoor localization using the plurality of remote DRUs.
17. The system of claim 16 wherein the plurality of OAAUs are coupled via at least one of Ethernet cable, Optical Fiber, or Wireless Link.
18. A system for indoor localization using GPS signals in a Distributed Antenna System, the system comprising:
a plurality of Multiple Input Off-Air Access Units (MIOAAUs), each receiving a GPS signal from at least one of a plurality of GPS satellites;
at least one Digital Access Unit (DAU) in communication with the plurality of MIOAAUs;
a plurality of remote Digital Remote Units (DRUs), each of the plurality of remote DRUs being operable to:
receive a GPS satellite signal for each of the plurality of MIOAAUs from the at least one DAU;
delay the GPS satellite signal for each of the plurality of MIOAAUs; and
transmit the delayed GPS satellite signal for each of the plurality of MIOAAUs to a mobile device for providing indoor localization of the mobile device using the plurality of DRUs.
19. The system of claim 18 wherein the remote DRUs are located at a Remote location with respect to the plurality of DAUs.