BluetoothEE625 Research Presentation

By Ryan DillonSeptember, 2014

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

Content

Named after Danish King: Harald Blitand

Short range (~10m)

Bluetooth Special Interest Group (SIG)◦ IBM, Intel, Nokia and Toshiba in 1998◦ Started with 70 members, now >20,000

Introduction

Why Bluetooth?

Why How

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

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

The Band

Class

Max. permitted power Typ.

range[13]

(m)(mW) (dBm)

1 100 20 ~100

2 2.5 4 ~10

3 1 0 ~1

Flavors of Bluetooth

Version Data rateMax.

application throughput

1.2 1 Mbit/s >80 kbit/s

2.0 + EDR 3 Mbit/s >80 kbit/s

3.0 + HS 24 Mbit/s <24 Mbits/s

4.0 24 Mbit/s<24 Mbits/s-Wi-Fi Std-Low Energy

802.11 - 2Mbs◦ Direct Sequence Frequency Hoping Spread

Spectrum .b High-Rate - 11Mbs .g - 22Mbs .a - 54 Mbs

◦ Orthogonal Frequency Division Multiplex◦ 5 GHz

FCC 802 Standards

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

Modulation & FHSS

NetworkingConnection

Architecture

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

[3][4]

ModelingMatlab

Matlab Central file exchange Transmitter Receiver Random integer generator (1-79) Channel Bit Error Rate

System Modeling

[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

Transmitter

[1]

Converter to IF De-spread and demodulated Packet is dissembled Viterbi decoded

Receiver

[1]

Matlab Demonstration

Future Technology◦ 2.4GHz is getting full◦ 5 and 17.1 GHz prospected◦ More bandwidth◦ Orthogonal FDM

Future Applications◦ Industrial Automation◦ Complete wire replacement

Conclusion

[2]

Questions?Thank you for your time.

[1] Amperordirect.com, "Class 1 Bluetooth Dongle Test," Amperordirect, [Online]. Available: http://www.amperordirect.com/pc/r-electronic-resource/z-reference-bluetooth-class1-myth.html. [Accessed 30 August 2014].

[2] Bluetooth Organization, "Profiles Overview," bluetooth.org, [Online]. Available: https://developer.bluetooth.org/TechnologyOverview/Pages/Profiles.aspx. [Accessed 30 August 2014].

[3] National Institute of Standards and Technology, "Guide to Bluetooth," September 2008. [Online]. Available: http://large.stanford.edu/courses/2012/ph250/roth1/docs/890066.pdf. [Accessed 30 August 2014].

[4] S. R. Reddy, "Bluetooth in Wireless Communication," IEEE Communications Magazine, no. June, pp. 90-96, 2002.

[5] Mathworks, "Matlab Central," 10 September 2001. [Online]. Available: http://www.mathworks.com/matlabcentral/fileexchange/722-bluetooth-modulation-and-frequency-hopping. [Accessed 30 August 2014].

[6] University of Ouro Preto, "Characterization of FHSS in Wireless Personal Area," IEEE, Vols. 978-1-4673-5699-2, no. 13, pp. 39-44, 2013.

References