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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

Bluetooth

EE625 Research Presentation

By Ryan Dillon

September, 2014


Content

Content

Introduction

Why Bluetooth

The Band

Flavors of Bluetooth

FCC Standards

Modeling

Conclusion

Questions


Introduction

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


Why bluetooth

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


The band

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


Flavors of bluetooth

Flavors of Bluetooth


Fcc 802 standards

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


Modulation fhss

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


Networking

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]


Modeling

Modeling

Matlab


System modeling

System Modeling

[1]

Matlab Central file exchange

Transmitter

Receiver

Random integer generator (1-79)

Channel

Bit Error Rate


T ransmitter

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


Receiver

Receiver

[1]

Converter to IF

De-spread and demodulated

Packet is dissembled

Viterbi decoded


Matlab demonstration

Matlab Demonstration


Conclusion

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


Questions

Questions?

Thank you for your time.


References

References


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