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Bluetooth

Bluetooth. EE625 Research Presentation By Ryan Dillon September, 2014. Content. Introduction Why Bluetooth The Band F lavors of Bluetooth FCC Standards Modeling Conclusion Questions. Introduction. Named after Danish King: Harald Blitand Short range (~10m)

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Bluetooth

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  1. Bluetooth EE625 Research Presentation By Ryan Dillon September, 2014

  2. Content Introduction Why Bluetooth The Band Flavors of Bluetooth FCC Standards Modeling Conclusion Questions

  3. Introduction • Named after Danish King: HaraldBlitand • Short range (~10m) • Bluetooth Special Interest Group (SIG) • IBM, Intel, Nokia and Toshiba in 1998 • Started with 70 members, now >20,000

  4. Why Bluetooth? • Communication while Mobile • Eliminates Cable • Common • Low-Cost • Universal • Low Interference Rates • Power Efficient • Protected • Technology has allowed for lightweight low power • Operation in GHz band allows for larger bandwidth • <$5 Chipsets • IEEE Standards and SIG • Low transmission energy • FHSS • Viterbi Cyclic Encoding Why How

  5. The Band • ISM (Industrial Scientific Medical) Unlicensed Band • 915MHz, 2.4GHz, 5GHz • Etiquette • Listen before you talk • Low Tx Power • Restricted duration • Increasing congestions • WLAN is heading to the 5GHz range • Some going to the 17.1GHz range

  6. Flavors of Bluetooth

  7. FCC 802 Standards • 802.11 - 2Mbs • Direct Sequence Frequency Hoping Spread Spectrum • .b High-Rate - 11Mbs • .g - 22Mbs • .a - 54 Mbs • Orthogonal Frequency Division Multiplex • 5 GHz

  8. Modulation & FHSS • Data Modulation • IF FSK with Viterbi Cyclic Encoding • Complex Phase Modulator (CPM) • 6th order Viterbi Cyclic Encoding • FHSS • Frequency Shift Key (FSK) • Signal is spread onto 1 MHz channel • 79 Channels in the band • 1600 Hops per second

  9. Networking • Inquiries • Address, Clock, Unique Info • Host • High Level Logic Link Control (LLC) • Client • Link Manager (radio, baseband ) • Infrastructure • Ad-Hoc Scatternets • Best suited • 7 Active Links • 255 inactive Connection Architecture [4] [3]

  10. Modeling Matlab

  11. System Modeling [1] Matlab Central file exchange Transmitter Receiver Random integer generator (1-79) Channel Bit Error Rate

  12. Transmitter [1] • Data conditioning • 10 samples per frame • Viterbi 10/15, 6th order encoder • 625 bit packet • Modulation • Continuous Phase Modulation • Progressive phase modulation • Convolved with FSK • 79 channels • 100 times the data rate

  13. Receiver [1] Converter to IF De-spread and demodulated Packet is dissembled Viterbi decoded

  14. Matlab Demonstration

  15. Conclusion [2] • Future Technology • 2.4GHz is getting full • 5 and 17.1 GHz prospected • More bandwidth • Orthogonal FDM • Future Applications • Industrial Automation • Complete wire replacement

  16. Questions? Thank you for your time.

  17. References

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