Bluetooth Technology Who Am I? Tom Tirrell BSEE Computer Engineering, UofM Ann Arbor MSEE Computer...
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Bluetooth Technology Who Am I? Tom Tirrell BSEE Computer Engineering, UofM Ann Arbor MSEE Computer Engineering/Communication Theory, Wayne State, Detroit
Bluetooth Technology Who Am I? Tom Tirrell BSEE Computer
Engineering, UofM Ann Arbor MSEE Computer Engineering/Communication
Theory, Wayne State, Detroit Applications of computers in industry
was my profession Networking computers is my hobby Email:
[email protected]
Slide 2
Bluetooth Technology History 10 th Century Danish King Harold
Blatand (Bluetooth) 1942 The actress Hedy Lamarr invents spread
spectrum frequency hopping 1994 Invention of Bluetooth technology
1998 Bluetooth SIG formed 1999 Bluetooth 1.0 Released 2005
Bluetooth 2.0 with Enhanced Data Rate (EDR) 2009 Bluetooth 3.0 with
High Speed (HS) 2009 Bluetooth 4.0 low energy
Slide 3
Bluetooth Technology Logo The logo is a bind rune merging the
Old Norse Younger Futhark rune for Hagall or Harald meaning Hail
and anglicized to Harold .. And the rune for Bjarkan, anglicized to
Bluetooth Haralds initials.
Slide 4
Bluetooth Technology Version 1 250 Kbps data transfer rate 10m
range Suitable for voice transmission over cell phones
Slide 5
Bluetooth Technology Version 2 + EDR 3 Mbps data transfer rate
10m range Suitable for high quality audio transmission
Slide 6
Bluetooth Technology Version 3 +HS/EDR 24 Mbps data transfer
rate 10m range Suitable for video data streaming Requires
collocated WiFi link.
Slide 7
Bluetooth Technology Version 4 +HS/EDR Simplified data stack
Enables low energy communication powered by coin battery from small
sensors. Incorporates the V3 +HS/EDR spec
Slide 8
Bluetooth Technology Version 2.1 or 4.0 are most common Current
active version is 4.2 HS, EDR, Encryption are optional
Versions
Slide 9
Bluetooth Technology Class 1: 100 Meter range, 100mW Class 2:
10 Meter range, 2.5mW Class 3: 1 Meter range, 1mW Classes
Slide 10
Bluetooth Technology Use an external microphone/speaker to
handle calls from you mobile phone. Only very short range is
required Applications: Mobil Phones
Slide 11
Bluetooth Technology Class 2 Bluetooth Radio Plays Audio from
Bluetooth devices Clock Alarm/Radio Applications: Remote Speakers
(AC Powered)
Slide 12
Bluetooth Technology Targus TSA-34BT Class 2: 10 Meter range
Unknown Version probably 2.1 Applications: Computer Speakers
(Battery Powered)
Slide 13
Bluetooth Technology Version 4.0 w/EDR Class 2: 10 Meter range
Transmits from RCA or 3.5mm jacks Applications: Bluetooth
Transmitter
Slide 14
Bluetooth Technology Heart of the old system was an Onkyo
Amplifier/Receiver. Applications: Home Theater
Slide 15
Bluetooth Technology Rear View of Onkyo
Amplifier/Receiver.
Slide 16
Modern Home theater systems use a smart TV as the heart of the
system
Slide 17
Bluetooth Technology Leftover Equipment Applications: Home
Theater
Slide 18
Bluetooth Technology Floating temperature sensors 50 Meter
range, Class ?? Bluetooth Smart (i.e. Version 4.2) Applications:
Piconets
Slide 19
Bluetooth Technology Wi-Fi is faster and longer range Wi-Fi has
better security Bluetooth is simpler to connect Comparison with
WiFi
Wireless Router Security 2.4 GHz Channels Spread Spectrum
modulation causes the radio energy to spread across several
channels. Due to the high frequency, short distance, this is
usually not a problem You can select a set of non-overlapping
channels when you have several routers The most common is channels
1, 6 and 11 as shown here. In North America, only channels 1-11 are
used
Slide 22
Technical Notes More noise, lower channel capacity More
bandwidth, higher channel capacity Shannon Hartley Theorem
Slide 23
Technical Notes Transmit across all channels in the Bandwidth
Each channel is used only a short time Looks like a small increase
in background noise Spread Spectrum
Slide 24
Technical Notes Adaptive Frequency Hopping
Slide 25
Technical Notes Using combinations of resistors, inductors and
capacitors to design pass-band and pass-block filters Filter
Design
Slide 26
Technical Notes Bluetooth Protocol Stack Mandatory protocols
for all Bluetooth stacks are: LMP, L2CAP and SDP.
Slide 27
Technical Notes Pairing In Discoverable mode transmits Device
Name Device Class List of Services Specifications (features, mfg.,
BT version, clock offset. Pairing may be w/o user interaction where
the xmitter and receiver exchange unique keys. Usually this means
that only one device can be paired at a time. User interaction to
press a button, punch in a code or merely acknowledge that both
devices display the same code can allow multiple devices to be
paired. There are lots of diff. pairing methods.