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ECE150 (Mobile Embedded Systems) > Bluetooth > Flashcards

Bluetooth Flashcards

1
Q

What is Bluetooth?

A
  • Wireless Personal Area Network (WPAN)
  • Universal short-range wireless capability
  • Uses 2.4 GHz
  • IEEE 802.15
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2
Q

What is Frequency Hopping Spread Spectrum (FHSS):

A
  • Signal hops from frequency to frequency at fixed intervals
  • Hopping sequence dictated by spreading code
  • Receiver, hopping between frequencies in synchronization with transmitter, picks up message
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3
Q

How does FHSS Transmitter work?

A

User data -> modulator -> narrowband signal -> modulator - frequency synthesizer- hopping sequence -> spread transmit signal

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4
Q

How does FHSS Receiver work?

A

received signal narrowband signal -> demodulator-frequency synthesizer - hopping sequence -> data

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5
Q

What is in Access Code?

A
  • Timing synchronization
  • Frequency offset compensation
  • Paging, and inquiry
  • Address of Piconet primary
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6
Q

What is in a packet header?

A
  • Addressing (Max of 7 active secondary devices)

- Packet type (16 packet types)

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7
Q

What is in the payload?

A
  • Voice

- Header | DATA | CRC

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8
Q

What is a piconet?

A
  • BT communication takes place over Piconets
  • Piconet formation initiated by primary
  • All other participants are secondary devices
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9
Q

How many participants are allowed to 1 primary?

A

7 secondary

- Each assigned a locally unique address.

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10
Q

How long do primary/secondary roles last?

A

For the duration of the piconet

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11
Q

What is the initial state of nodes when unconnected?

A

Standby

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12
Q

What is inquiry?

A

When primary node find nearby devices during connection

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13
Q

What is paging?

A

When the primary invite others to join its piconet and send paging message to selected receiver

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14
Q

How does a secondary respond to a paging message by a primary?

A

Sending an ACK

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15
Q

What happens in active state?

A
  • Transmit

- Connected

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16
Q

What are the three states of Low-Power?

A
  • Hold
  • Sniff
  • Park
17
Q

What is hold?

A

Node sleeps for specified interval

- Primary can put secondary in hold while searching for new members, attending another piconet, etc

18
Q

What is sniff?

A

Secondary low-duty cycle mode

  • Secondary wakes up periodically to talk to primary
  • fixed sniff intervals
19
Q

What is park?

A

Very low power state

  • Used to admit more than 7 secondary devices in Piconet - gives up its active member address and receives parked member address
  • Wakes up periodically listening for broadcasts which can be used to “unpack” node
20
Q

What makes multiple piconets?

A
  • When piconet overlap in space and time due to nodes participating in more than 1 piconet
  • “Time sharing”
21
Q

What is scatternet?

A
  • Interconnection of multiple piconets

- Interconnection by bridge nodes

22
Q

What are the roles of bridge nodes?

A
  • “Stay” in a piconet for some time, then switch to another Piconet by changing hop sequence
  • Send and receive in each Piconet
  • Forward from one Piconet to another
23
Q

What is A2DP: Advanced Audio Distribution Profile

A

Stereo Audio from smartphone to headphone

24
Q

What is aptX?

A
  • Wireless real-time streaming of high quality audio

- Proprietary audio compression algorithms

25
Q

What is Enhanced Data Rate (EDR)?

A
  • Faster data transfer

- Lower power consumption using reduced duty cycle

26
Q

What is High Speed?

A
  • Data is carried over Wi-Fi Link

- Used for control channel

27
Q

What is Bluetooth Beacons?

A
  • Bluetooth Low Energy (BLE) based

- Bluetooth beacon devices transmit a unique user ID (UUID) number that can be read by a Bluetooth receiver

28
Q

What are Bluetooth Beacons for?

A

Proximity, not localization

29
Q

What are the programmable parameters of Beacons?

A
  • Transmit power

- Frequency

30
Q

What are applications of Bluetooth Beacons?

A
  • Advertisement and Coupon distribution
  • Home automation systems
  • Transportation systems
  • Sport stadiums

ECE150 (Mobile Embedded Systems) (12 decks)

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