Lecture 16: RFID and Bluetooth
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Lecture 16: RFID and Bluetooth






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    Lecture 16: RFID and Bluetooth Lecture 16: RFID and Bluetooth Presentation Transcript

    • RFID Review / Bluetooth ENGR 475 – Telecommunications Harding University December 5, 2006 Jonathan White
    • Outline
      • What you need to know about RFID
      • Bluetooth
      • Applications
      • Future
      • Technical Specifications
        • Algorithms
        • Air Interface
        • Security Concerns
    • RFID Review
      • RFID – Radio Frequency Identification.
      • Idea:
        • Use low cost tags to identify objects
      • Benefits:
        • Line of sight isn’t required (as in UPC Codes).
        • Much faster inventorying of objects.
        • Enables each item to be uniquely identified.
    • RFID Review
      • 3 types of tags:
        • Active: Have a battery, are always able to transmit and receive, very large, long range, very expensive.
          • Example: Airplane controllers
        • Semi-Active: Have a battery, but they only transmit when in an RF field. They are large and fairly expensive.
          • Example: Toll tags
        • Passive: No battery, receive power from only the RF field, very small, very cheap, small range.
          • Example: Entry key fobs, Exxon SpeedPass, EPCGlobal tags.
    • EPC
      • Electronic Product Code.
        • A replacement for UPC
        • Has all the data of a UPC plus other fields.
        • Some fields can be used to store variables.
        • Some fields can be used to uniquely identify each object.
        • Many interesting applications.
    • EPC Details
      • Low Range: 20 feet
      • Low Cost: 5 cents
      • Low Power requirements:
        • Near field: Under 10 cm or so, tag acts like the opposite side of a transformer, and it can receive more power.
        • Far field: From .5 feet to 20 feet, tag uses backscattering to reflect a modulated RF field to the receiver.
      • Operates in the 900 MHz region.
        • Unlicensed, limited by the government.
    • Bluetooth
      • Designed in Sweden in 1994.
      • The goal was to design one interface for devices to connect and exchange information wirelessly.
        • This would aid in the elimination of all the cables that are proliferating all around us.
        • Not designed to provide power, however.
        • Also, Bluetooth was originally designed to be short range and secure, but this is not necessarily true now.
    • Bluetooth Applications
      • Wireless Cell phone handsets
      • Wireless controllers (Wii)
      • Wireless computer connections
        • Most common: keyboard, mouse, printer
      • For remote controls where IR was used.
        • Better range and accuracy.
          • PDA’s, Calculators
      • Transfer of files in an Ad Hoc Network.
        • If you don’t have a WiFi network available.
    • Bluetooth Applications
    • Future of Bluetooth
      • Bluetooth has a good future:
        • Data rates of 3 Mbps
        • Better security
        • Better range.
      • This will allow Bluetooth TVs and video projectors.
      • The goal is to make an unwired society.
        • But, you still need power.
    • Technical Specs
      • Bluetooth operates in the 2.4 GHz range.
        • Unlicensed, same band that certain wireless phones, garage door openers, and baby monitors use.
      • Bluetooth devices typically operate at around .1 Watts.
        • Much less than the 3 Watts that a typical cell phone operates at.
      • Maximum range is supposed to 100 meters.
        • This can be extended to a mile with antennas.
    • Technical Specs
      • Bluetooth can connect up to 8 devices.
        • 1 master, 7 slaves with about a 10 meter radius.
      • Bluetooth uses spread spectrum frequency hopping.
        • There are 79 potential frequencies a device can transmit on, so this should help eliminate collisions.
    • Technical Specs
      • Devices constantly scan for a new Bluetooth connection.
        • This lets them know what master is controlling them, and whether or not another device should be added to the group.
      • Since this connection is automatic, security is a large problem for Bluetooth.
        • Bluetooth viruses, bluejacking, blue bugging.
    • Conclusion
      • The use of Bluetooth will be expanded in the coming years.
      • Good for a wire replacement.
      • It won’t replace WiFi or cellular networks.
        • It’s impact on Telecommunications is very secondary.