Indoor localization using digital off-air access units

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 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 . (canceled) 
     
     
         2 . A system for indoor localization using navigation signals in a Distributed Antenna System, the system comprising:
 a plurality of Digital Access Units (DAUs);   an Off-Air Access Unit (OAAU) operable to receive satellite navigation signals transmitted by a plurality of navigation satellites, and operable to route the satellite navigation signals to one of the plurality of DAUs; and   a plurality of remote Digital Remote Units (DRUs) located at a Remote location, wherein each of the plurality of remote DRUs is operable to receive the satellite navigation signals from one of the plurality of DAUs and operable to transmit delayed satellite navigation signals to a mobile device for providing the indoor localization using the plurality of remote DRUs.   
     
     
         3 . The system of  claim 2  wherein each of the plurality of remote DRUs is operable to:
 delay the received satellite navigation signals and transmit the delayed satellite navigation signals to the mobile device. 
 
     
     
         4 . The system of  claim 2  wherein:
 the OAAU is configured to:
 convert the satellite navigation signals to digital satellite navigation signals and route the digital satellite navigation signals through an optical cable to the one of the plurality of DAUs; 
 
 each of the plurality of DAUs is configured to:
 time multiplex the digital satellite navigation signals; and 
 route the time multiplexed digital satellite navigation signals to at least one of the plurality of remote DRUs; and 
 
 each of the plurality of remote DRUs is configured to:
 demultiplex the time multiplexed digital satellite navigation signals; 
 delay the demultiplexed digital satellite navigation signals; 
 convert the demultiplexed digital satellite navigation signals to RF satellite navigation signals; and 
 transmit the RF satellite navigation signals. 
 
 
     
     
         5 . The system of  claim 2  wherein each of the plurality of remote DRUs is operable to transmit a combination of the delayed satellite navigation signals. 
     
     
         6 . The system of  claim 2  wherein each of the plurality of remote DRUs is operable to transmit different ones of the delayed satellite navigation signals. 
     
     
         7 . The system of  claim 2  wherein the OAAU is coupled to the one of the plurality of DAUs via at least one of Ethernet cable, Optical Fiber, or Wireless Link. 
     
     
         8 . The system of  claim 2  wherein the satellite navigation signals comprise at least one of GPS, GLONASS, Galileo, QZSS, or BeiDou signals. 
     
     
         9 . A system for indoor localization using satellite navigation signals in a Distributed Antenna System, the system comprising:
 a plurality of Digital Access Units (DAUs) operable to route signals between each other;   a plurality of Off-Air Access Units (OAAUs) coupled together via a daisy chain configuration, and operable to receive satellite navigation signals transmitted by a plurality of navigation satellites, and operable to route the satellite navigation signals to one of the plurality of DAUs; and   a plurality of remote Digital Remote Units (DRUs) located at a Remote location, wherein each of the plurality of remote DRUs is coupled to one of the plurality of DAUs and is operable to transmit delayed satellite navigation signals to a mobile device for providing the indoor localization of the mobile device using the plurality of DRUs.   
     
     
         10 . The system of  claim 9  wherein each of the plurality of remote DRUs is operable to:
 receive the satellite navigation signals transmitted by one of the plurality of DAUs; and 
 delay the received satellite navigation signals. 
 
     
     
         11 . The system of  claim 9  wherein each of the plurality of remote DRUs is operable to transmit a combination of the delayed satellite navigation signals. 
     
     
         12 . The system of  claim 9  wherein each of the plurality of remote DRUs is operable to transmit different one of the delayed satellite navigation signals. 
     
     
         13 . The system of  claim 9  wherein the satellite navigation signals comprise at least one of GPS, GLONASS, Galileo, QZSS, or BeiDou signals. 
     
     
         14 . The system of  claim 9  wherein the plurality of DAUs are coupled via at least one of a Ethernet cable, Optical Fiber, or Wireless Link. 
     
     
         15 . The system of  claim 9  wherein the plurality of OAAUs are coupled to the one of the plurality of DAUs via at least one of Ethernet cable, Optical Fiber, or Wireless Link. 
     
     
         16 . A system for indoor localization using satellite navigation signals in a Distributed Antenna System, the system comprising:
 a plurality of Digital Access Units (DAUs) operable to route satellite navigation signals between each other;   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 signal to one of the plurality of DAUs; and   a plurality of remote Digital Remote Units (DRUs) located at a Remote location, wherein each of the plurality of remote DRUs is coupled to one of the plurality of DAUs and is operable to transmit delayed satellite navigation signals to a mobile device for providing the indoor localization of the mobile device using the plurality of DRUs.   
     
     
         17 . The system of  claim 16 , wherein the plurality of remote DRUs are operable to:
 receive the individual satellite navigation signal from the one of the plurality of DAUs; and   delay the received individual satellite navigation signal.   
     
     
         18 . The system of  claim 16  wherein each of the plurality of remote DRUs is operable to transmit a combination of the delayed satellite navigation signals. 
     
     
         19 . The system of  claim 16  wherein each of the plurality of DRUs is operable to transmit different ones of the delayed satellite navigation signals. 
     
     
         20 . The system of  claim 16  wherein the delayed satellite navigation signals are a function of a positional offset for each DRU. 
     
     
         21 . The system of  claim 16  wherein each of the plurality of OAAUs comprises a directional antenna operable to communicate with a distinct subset of the plurality of satellites.