Impact of other systems on Bluetooth

huoying

Contents
1 Introduction................................................................................................................6
1.1 Aim of this thesis ......................................................................................................6
1.2 Limitations ...............................................................................................................6
1.3 Method .....................................................................................................................6
1.4 Background..............................................................................................................7
1.5 Structure of thesis ....................................................................................................7
1.6 Abbreviations ...........................................................................................................8
2 Bluetooth.....................................................................................................................9
2.1 History .....................................................................................................................9
2.2 Bluetooth Technology ..............................................................................................9
2.3 Network Topology..................................................................................................10
2.4 Bluetooth Architecture ...........................................................................................12
2.5 Connection Establishment in Bluetooth .................................................................14
2.6 Connection Modes in Bluetooth .............................................................................15
2.7 Bluetooth Security..................................................................................................16
2.8 Packet Types ..........................................................................................................17
2.8.1 Common Packets ...........................................................................................17
2.8.2 SCO packet ....................................................................................................18
2.8.3 ACL Packets ..................................................................................................19
2.9 Error Correction & Detection ...............................................................................20
2.10 Bluetooth Applications in Automotive Environment..........................................21
2.10.1 Other Applications in brief ............................................................................22
3 2.4 GHz ISM Band...................................................................................................23
3.1 National Channel Arrangement.............................................................................23
3.2 IEEE 802.11...........................................................................................................23
3.2.1 IEEE 802.11b (DSSS) ...................................................................................24
3.2.2 IEEE 802.11b (FHSS) ...................................................................................24
3.3 HomeRF (WBFH) ..................................................................................................24
3.4 Microwave Oven ....................................................................................................25
3.5 Spread Spectrum Modulation Techniques .............................................................26
3.5.1 Direct Sequence Spread Spectrum (DSSS) ...................................................27
4
3.5.2 Frequency Hopping Spread Spectrum (FHSS)..............................................28
4 Analysis of Bluetooth system in the presence of AWGN and fading channels..29
4.1 Channel..................................................................................................................29
4.1.1 Additive White Gaussian Noise .....................................................................29
4.1.2 Rayleigh fading channel ................................................................................29
4.1.3 Rician Fading channel ...................................................................................30
4.1.4 Path loss .........................................................................................................31
4.2 Bluetooth Data Transmission System Model.........................................................32
4.2.1 Simulation Results .........................................................................................33
4.3 Bluetooth Voice Transmission Model ....................................................................36
4.3.1 Master transmitter..........................................................................................37
4.3.1.1 CVSD Speech Coding...............................................................................37
4.3.1.2 HEC, FEC, and Framing............................................................................38
4.3.1.3 Modulation and Frequency Hopping .........................................................38
4.3.2 Slave receiver.................................................................................................40
4.3.3 Simulation Result...........................................................................................40
4.3.4 Conclusion .....................................................................................................41
5 Interference from 802.11b DSSS WLAN on bluetooth system............................42
5.1 WLAN 802.11b Mathematical Form (DSSS) .........................................................42
5.2 WLAN 802.11b System Model ...............................................................................42
5.3 Simulation Results .................................................................................................43
5.4 Conclusion .............................................................................................................46
6 Interference from 802.11b FHSS WLAN on Bluetooth system...........................47
6.1 802.11b Mathematical Model (FHSS) ...................................................................47
6.2 Model .....................................................................................................................47
6.3 Result .....................................................................................................................48
7 Piconet Interference.................................................................................................49
7.1 Model .....................................................................................................................49
7.2 Performance of ACL packet data links..................................................................50
7.3 Performance of SCO links .....................................................................................52
7.4 Conclusion .............................................................................................................54
8 HomeRF interference (WBFH) on Bluetooth system...........................................55
8.1 Model .....................................................................................................................55
5
8.2 FM Noise Theory ...................................................................................................55
8.3 Quatitative treatment .............................................................................................56
8.4 WBFH vs NBFH Power Spectral Density .............................................................57
8.5 Simulation Results .................................................................................................60
8.6 Conclusion .............................................................................................................60
9 Microwave oven interference on Bluetooth system..............................................61
9.1 Model .....................................................................................................................61
9.2 Interference analysis..............................................................................................62
9.3 Conclusion .............................................................................................................64
10 Suggestions for improvement .................................................................................65
10.1 Adaptive Frequency hopping.............................................................................65
10.2 Transmission power and rate control................................................................65
10.3 Adaptive selection of packet type.......................................................................66
11 Conclusion................................................................................................................67
12 References.................................................................................................................68

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