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Bluetooth Networks IEEE 802.15.1

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Bluetooth wireless technology is a short-range ... The system offers services that enable the connection of devices and the ... Bluetooth compact flash card ... – PowerPoint PPT presentation

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Title: Bluetooth Networks IEEE 802.15.1


1
Bluetooth NetworksIEEE 802.15.1
2
  • Supervised by
  • Dr. Hasan Abbas
  • Presented by
  • E. Amjad Saidy

3
  • How Bluetooth Technology Works.
  • The applications of bluetooth technology.
  • Data Bite Rate.

4
  • Bluetooth wireless technology is a short-range
    communications system intended to replace the
    cables connecting portable and/or fixed
    electronic devices.
  • The system offers services that enable the
    connection of devices and the exchange of a
    variety of data classes between these devices.

5
  • Bluetooth lets the devices communicate with each
    other when they are in range. The devices use a
    radio communications system, so they do not have
    to be in line of sight of each other, and can
    even be in other rooms, as long as the received
    transmission is powerful enough.1.

6

7
  • The spectrum band of Bluetooth has been decided
    to be the Industrial, Scientific and Medicine
    (ISM) Band, with frequency range in most
    countries from 2.40GHZ to 2.48 GHz .

8
  • The Bluetooth core system consists of hardware
    and software (RF transceiver, base band, and
    protocol stack).

9
  • One device provides the synchronization reference
    and is known as the master. All other devices are
    known as slaves.
  • A group of devices synchronized in this fashion
    form a piconet. This is the fundamental form of
    communication for Bluetooth wireless technology .

10
Physical channel
  • There is a Physical channel between every master
    and slave .
  • There are two types of physical link between a
    master a slave
  • 1- SCO (synchronous connection oriented)
  • 2- ACL (asynchronous connectionless)

11
  • SCO (synchronous connection oriented) The SCO
    link is a symmetric point-to-point link between
    the master and a specific slave, used for audio
    applications by rate 64kbps.
  • ACL (asynchronous connectionless) The ACL link
    is a packet switch type of connection between the
    master and all the active slaves used for
    transmission data by the rate 721kbps.2.

12
  • The physical channel between every master and
    slave is sub-divided into time units known as
    slots. Data is transmitted between Bluetooth
    enabled devices in packets that are positioned in
    these slots

13
  • The Bluetooth radio system adopts a slotted Time
    Division Duplex (TDD) transmission scheme, where
    each slot is 625 micro sec length and two slots
    form one frame. In addition, forward error
    correction and automatic repeat request for
    retransmission.

14
The data in the piconet channel is conveyed in
packets
15
  • The access code is a 72-bit which is used for
  • 1- synchronization between the master and slave.
  • 2-In paging and inquiry procedures.3.

16
  • The header is 54 bit which is used for error
    correction and automatic repeat request for
    retransmission.
  • In the pay load two field are distinguished. The
    synchronous voice field (SCO) and the
    asynchronous data field (ACL).

17
Establishing network connections
18
  • The initial state is that all Bluetooth devices
    are in STANDBY mode. In STANDBY mode, the
    devices, which are un-connected, listen
    periodically for messages. (Every 1.28 sec).
  • A connection is initiated by a PAGE message in
    the case of a known address, or in the case of an
    unknown address by an INQUIRY message

19
There are three power saving modes HOLD, SNIFF
PARK
  • If no data needs to be transmitted, the master
    can put slaves into HOLD.
  • The SNIFF mode is used in a way the slave device
    listens to the piconet at reduced rate.
  • The PARK mode keeps the device synchronized to
    the piconet. 4.

20
problem
21
  • The use of frequency-hopping multiple access
    schemes has enabled the simultaneous operation of
    different networks in the same area and narrow
    band Frequency Hopping (FH) ensures tolerance to
    of in-band interference.

22
  • In the range(2.4GHZ 2.48GHZ) there are
  • 79 frequencies( 79channels)
  • F 2402K MHZ
  • K0,1,2,.78
  • The frequency hops between these 79 frequencies
    by the rate 1600 hops/sec.5.

23
  • The modulation that is employed for Bluetooth
    radio system is a binary Gaussian-shaped FSK,
    with modulation index between 0.28 and 0.356.

24
The block diagram of GFSK transmitter
25
  • the simple and small transceiver implementation
    of GFSK system and its characteristic of constant
    envelope, which is desirable in fading. A
    transmitted GFSK signal can be written as

26
  • E the energy per symbol .
  • T the symbol period .
  • F the carrier frequency.
  • h the modulation index.

27
The out put of LPF
28

29
The applications of bluetooth technology

30
  • The main applications of Bluetooth radio system
    are wire replacement, local area network (LAN)
    access points, and personal area networks .

31
List of applications
  • Transfer of files between devices .
  • Between PC and mouse ,keyboard ,scanner and
    primter.
  • Between PC and PDA.
  • Between PC and home audio.
  • Between PC and XDSL ACCESS.

32
(No Transcript)
33
Bluetooth compact flash card
34
  • We put this device in USP of every computer and
    exchange data between these computers or between
    the computer and mobile

35
(No Transcript)
36
Local Area Network (LAN)
  • First form the computers must be placed in an
    area (circle) of 100 meters diameter, so data can
    be transmitted between any two computers.

37

38
  • Seconde form the distance between any two
    neighboring computers is 100 meters, so data can
    be transmitted between any two neighboring
    computers.

39
Data Bite rate
  • The theoretical bit rate is 1 Mbps, but in
    practical it is less .
  • We measured data bit rate in Bluetooth networks,
    by measuring file transfer throughput between
    Bluetooth network nodes at variable distances and
    under different conditions .

40
From mobile to mobile
41
From mobile to computer
42
From computer to computer
43
1- From mobile to mobile
44
From mobile to mobile
  • walls existed
  • no walls existed

45
-From mobile to computer2
46
From mobile to computer
  • walls existed
  • no walls existed

47
3-From computer to computer
48
From computer to computer
  • walls existed
  • no walls existed

49
Data bite rate depends on
  • The distance between receiver and transmiter .
  • The material of obstacle (glass ,wood, concrete).
  • The Maximum Permitted Power of the bluetooths
    signal .
  • The frequency which is used (2.40 2.48)GHZ.

50
Important caution
  • Passwords should be enterd at the terminals of
    the bluetooth networks to maintain the security
    of data.7.

51
References
  • 1-MADHUSHEE, G., Getting Started with Bluetooth,
    2002.
  • 2- HAARTSEN, J., Bluetooth The universal radio
    interface for ad hoc, 1998.
  • 3- POLLARD,J.K., Component-based Architecture for
    Simulation of Transmission Systems,2000.

52
  • 4-HAARTSEN,J.C., The Bluetooth Radio
    System,2000.
  • 5- BRAY, J. STURMAN, C. F., Bluetooth Connect
    without cables, 2001.
  • 6-Hewlett ,P ., Bluetooth Technology
    Overview,2003.
  • 7-GUHA,T. V.,bluetooth security ,2000 .

53
  • The end
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