????????? Wireless Network - PowerPoint PPT Presentation

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????????? Wireless Network

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Wireless Network : CS912 07-3121101 2782 itchen_at_kmu.edu.tw – PowerPoint PPT presentation

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Title: ????????? Wireless Network


1
?????????Wireless Network
  • ??? ???? ??CS912
  • 07-3121101 ? 2782
  • itchen_at_kmu.edu.tw

2
Outline
3
802.15 BlueTooth
4
(No Transcript)
5
Outline
6
?????? (WLAN)
7
(No Transcript)
8
802.11a/b/g/n???
???? ????(??/??) ???? ????
802.11a 54Mbps (22Mbps) ?30?? 5GHz
802.11a 108Mbps ?30?? 5GHz
802.11b 11Mbps (5Mbps) ?40-50?? 2.4GHz
802.11b 22Mbps ?40-50?? 2.4GHz
802.11g 54Mbps (22Mbps) ?40-50?? 2.4GHz
802.11g 108Mbps ?40-50?? 2.4GHz
802.11n 108Mbps ?30?? 5GHz
9
???????????
  • ??????? (Ad Hoc Network)

10
  • ??????? (Infrastructure Network)

11
  • ????? (portal) ??802.11?????????802.x??????

12
??????V.S.??????
  • ????????????????????,??????????
  • ??????????????????????????
  • ????????????????????????????????
  • 802.11??????? (MAC) ????????????????????,????802.x
    ????????????? (MAC) ???

13
Outline
14
?????? (WMAN)
15
?????? (WMAN)
  • ?????? (WMAN. WiMAX) ????IEEE?2002?????802.16,???8
    02.16 a/b/c/d/e/f ?? ?
  • ?????211GHz,????3.5GHz ??,???????75Mbps,????30
    ??
  • 802.16??QPSK?QAM-16 ?QAM-64??????,????????????,???
    ??????????

16
WiMAX Forum???IEK 2004/05
?? 802.16 802.16a/REVd 802.16e
???? 2001?12? 2003?1?/2004? Q4? ??2005??
???? ????? Backhaul ????? Backhaul ?????
???? 1066GHz 211GHz 26GHz
???? LOS(light of sight) NLOS NLOS
???? 32134Mbps (????28MHz?) 75Mbps (????20MHz?) 15Mbps (????5MHz?)
???? QPSK, 16QAM, 64QAM QPSK, 16QAM, 64QAM ?256???OFDM QPSK, 16QAM, 64QAM ?256???OFDM
??? ??? ??? ????(?20miles/hr)
???? 20, 25 ? 28MHz 1.520MHz 1.520MHz
???? 13?? 46??(??30??) 13??
17
802.16-2004 Max Raw data rate
Modulation/ Code Rate QPSK 1/2 QPSK 3/4 16 QAM 1/2 16 QAM 3/4 64 QAM 2/3 64 QAM 3/4
1.75MHz 1.04 2.18 2.91 4.36 5.94 6.55
3.5MHz 2.08 4.37 5.82 8.73 11.88 13.09
7.0MHz 4.15 8.73 11.64 17.45 23.75 26.18
10.0MHz 8.31 12.47 16.63 24.94 33.25 37.40
20.0MHz 16.62 25.94 33.25 46.87 66.49 74.81
18
Comparison of WiMAX xDSL
WiMax xDSL xDSL
IEEE 802.16 ADSL/ADSL2 VDSL/VDSL2
DL Data Rate 75Mbps 8M/1625M bps 55.2M/7-100M bps
UL Data Rate 75Mbps 2M bps 19.2M bps
Distance LOS 30-50Km NLOS 4-9Km 4Km/0.62Km 0.3Km2Km/ 0.4Km2Km
19
Comparison of WiMAX WiFi
Tech. WiMAX WiFi WiFi
Standard IEEE 802.16-2004 802.11b 802.11a/b
Data rate 75Mbps_at_BW20MBHz 11Mbps 54Mbps
Distance 3050kM(LOS)/49kM(NLOS) 100m(indoor) /300m(outdoor) 100m(indoor) /300m(outdoor)
RF freq. 266MHz 2.4MHz ISM 5GH u-N11, 2.4MHz ISM(g)
BW 1.2520MHz 22MHz 20MHz
PHY Mod. OFDM/OFDMA DSSS OFDM
QoS Yes No No
Mobility Low High High
20
Comparison of WiMAX 3G
Tech. WiMAX 3G 3G
Standard IEEE 802.16e CDMA-2000 WCDMA
Data rate 30Mbps_at_BW10MBHz 2.43.1Mbps 2Mbps/10Mbps(HSDPA)
Distance 35km 35km 35km
RF freq. 26MHz 400, 800, 700, 900, 1800, 2100MHz ISM 900, 1800, 2100
BW 1.2520MHz 1.25MHz 5MHz
PHY Mod. OFDM CDMA CDMA
Duplex TDD FDD FDD
Mobility Low High High
21
??WiMAX???????
22
LTE
  • Long Term Evolution
  • ??????????OFDM????????22?44 MIMO??????????????FD
    D?????TDD????
  • ????100Mbps???50Mbps??

http//zh.wikipedia.org/wiki/3GPP??????
23
WiMAX?LTE???
?? LTE WiMax
?????? 3GPP Intel???,IEEE??????
?? 3G/ 3.5G ?????? ?WiFi???
??????? ??100 Mbps ?? 50 Mbps ?? 75Mbps?? 75Mbps
?????? 3 Km 30 Mile
?? 3G/ 3.5G???????,????????? Intel ????,
???? Qualcomm?Motorola?Actel-Lucent?NEC?NextWave Wireless?Nokia?Siemens?Sony-Ericsson,NTT????????, ?????? Intel??,??????
http//cdnet.stpi.org.tw
??
??????
??
???????
??????
??
????
LTE WiMax
3GPP Intel???,IEEE??????
?? 3G/ 3.5G ?????? ?WiFi???
??????? ??100 Mbps ?? 50 Mbps ?? 75Mbps?? 75Mbps
?????? 3 Km 30 Mile
?? 3G/ 3.5G???????,????????? Intel ????,
???? Qualcomm?Motorola?Actel-Lucent?NEC?NextWave Wireless?Nokia?Siemens?Sony-Ericsson,NTT????????, ?????? Intel??,??????
24
Outline
25
??????(WPAN)?????,??????
26
Outline
27
????
28
???????-????
29
???????-????
30
GPRS
  • ??????????????????Internet,??????????ETSI???GPRS??
    ?
  • ??GPRS?????????????????24?56Kbps,??2002???????????
    ?,????????115Kbps?

31
WAP
  • ???????????
  • WML (Wireless Markup Language)
  • WAP Gateway/Proxy

32
i-mode
  • i-mode????????
  • ?????
  • ??Compact HTML
  • ????
  • ??????

33
PHS (Personal Handy-phone System)
  • ?? 18801930 Mhz
  • ??2G???
  • ????, ???????, ????
  • ??TDMA/TDD???????????
  • 2006/9/7????????????PHS?????????,????????????????
    ????????

34
PHS ??
???? ???? ????
???? ???? ????
???? ???? 1.9 0.04
(??????) (??????) (0.55) (0.01)
???? ???? 3.9 0.08
???? ???? 2.9 0.06
???? ???? 6 0.1
???? ???? 0.95?/? 0.95?/?
(??????) (??????) 0.55?/? 0.55?/?
?? ?? ??1.5?/???2.5?/? ??1.5?/???2.5?/?
35
PHS ????
  • ????????????????
  • ??????????

36
PHS v.s. GSM
??
????
????? ????? ?? ??
??????? ??????? 500?? 40,000??
??? ??? 100??/?? 120??/??
???? ???? ??80?? 80????
?????? ?????? ??10?? 8001000??
37
PHS v.s. GSM
??
????
???? ???? ??32-64K ????256K 9.6K
PDA???????????? PDA???????????? ? ???????
????? ????? ? ??????
E-mail??????? E-mail??????? ? ??
???????? ???????? ? ??
???? ???? ????/?????? WAP??????
38
????

????/ ?? ????/ ?? ??/ ?????? ??/ ?????? ??/ ?????? ??/ ?????? ??/ ????? ??/ ?????
PHS ??????? (UT???) PHS (0968 0966) 2005/12/31???? 2005/12/31???? 2005/12/31???? 11,000 3,000 3,000 ????,??,??,???? ??,?? ??,??,?,?? ??? 2006/12 2007/12 2006/08/01 ??2006?? 121?? 140??
3G WCDMA (???????) ?? (0989) 2005/12/31 3,000 ??,??,??,?? ??????2G?? ??? 2005/08/01 ??2006?? 25?? 80??
3G WCDMA (????MOTO) Vibo (0986) 2005/12/31 ??2006?? 3,000 4,000 ???? ??? 2005/08/01 ??2006?? 25?? 75??
3G WCDMA (???????) ????? (0987) 2005/12/31 ??2006?? 2,000 3,000 ???? ??????2G?? ??? 2005/08/01 ??2006?? 33?? 100??
3G WCDMA (???) ???? (0988) 2005/12/31 ??2007?? 3,000 4,500 ???? ??????2G?? ??? 2005/08/01 ??2006?? 45?? 80??
3G WCDMA (????) APBW (0982 0980) 2005/12/31 ??2006?? 1,500 2,500 ????,?? ??? 2005/08/01 ??2006?? 91?? 125??
39
3G-???????
  • 3G???????????,???????Internet,????????????
  • ?????2Mbps,?????????Internet/Intranet????????????
  • 3G?????????????
  • W-CDMA ??,?????,??,??
  • CDMA2000 ??
  • TD-SCDMA ??

40
???????????
41
TDMA FDMA CDMA
42
B3G (?3G??)
  • ??3G?????????,??3.5G?4G?5G?
  • ??IP??????????,?????2G???9,600bps??????????2100M
    bps????????

43
3.5G HSDPA
  • HSDPA
  • High-Speed Downlink Packet Access, 3.5G
  • HSUPA
  • High-Speed Uplink Packet Access, 3.75G
  • UMTS
  • Universal Mobile Telecommunications System
  • ??3.6Mbps???????7.2Mbps
  • 1???????HSDPA???14.4Mbps

44
4G WiMax LTE
  • 3GPP ?4G????????????
  • ?Radio Access Network,???? 100 Mbps,?????
    (Roundtrip Time) ?? 10 ms?
  • ???????5MHz???20MHz
  • ?????? Frequency Division Multiplexing ?????Time
    Division Multiplexing
  • ???????????? (Handoff) ? ?? (Roaming),????????
    (ubiquitous) ?????

45
??GSM ??GSM ??GSM ??GSM ??GSM ??GSM ??GSM ??GSM ??GSM ??GSM ??GSM ??GSM
??? ?????(?/?) ?????(?/?) ?????(?/?) ?????(?/?) ?????(?/?) ?????(?/?) ?????(?/?) ?????(?/?) ?????(?/?) ?????(?/?) ?????(?/?)
??? ?? ?? ?? ?? ??? ??? ??? ?? ?? ?? ??
??? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??
??? ??? 200 0.08 0.08 0.04 0.01 0.08 0.04 0.04 0.14 0.08 0.15 0.08
??? ??? 600 0.05 0.05 0.03 0.01 0.05 0.03 0.03 0.09 0.05 0.1 0.05
emome??399 (???????, ????1) emome??399 (???????, ????1) 399 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.14 0.14 0.15 0.15
emome??599 (???????, ????2) emome??599 (???????, ????2) 599 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.14 0.14 0.15 0.15
???? ??? 88? 88 0.1 0.1 0.1 0.01 0.1 0.1 0.1 0.16 0.16 0.165 0.165
???? ??? 188? 188 0.08 0.08 0.08 0.01 0.08 0.08 0.08 0.155 0.155 0.16 0.16
???? ??? 288? 288 0.08 0.08 0.08 0.01 0.08 0.08 0.08 0.14 0.14 0.15 0.15
???? ??? 588? 588 0.07 0.05 0.05 0.01 0.07 0.07 0.05 0.117 0.117 0.125 0.125
???? ??? 988? 988 0.06 0.04 0.04 0.01 0.06 0.06 0.04 0.1 0.1 0.115 0.115
???? ??? 168? 1688 0.05 0.03 0.03 0.01 0.05 0.05 0.03 0.09 0.09 0.105 0.105
???? ??? ?? 128? 88(?? ??? 128?) 23000500 ???? 23000500 ???? 23000500 ???? 0.01 0.1 23000500 ???? 23000500 ???? 0.01 0.1 0.175 0.175 0.18 0.18
46
???? ???? ???? ???? 183? 383? 583? 983? 1683?
???(?) ???(?) ???(?) ???(?) 183 383 583 983 1683
???? ???? ???? ???? ?????????? ?????????? ?????????? ?????????? ??????????
???? (?/?) ?? ?? ?? 0.08 0.07 0.06 0.04 0.03
???? (?/?) ?? ?? ?? 0.07 0.06 0.05 0.03 0.03
???? (?/?) ??? ??? ?? 0.08 0.07 0.06 0.04 0.04
???? (?/?) ??? ??? ?? 0.07 0.06 0.05 0.03 0.03
???? (?/?) ??? ??? ?? 0.07 0.06 0.05 0.03 0.03
???? (?/?) ?? ?? ?? 0.1445 0.1353 0.1128 0.1038 0.0948
???? (?/?) ?? ?? ?? 0.1400 0.1263 0.1056 0.0902 0.0812
???? (?/?) ?? ?? ?? 0.12 0.11 0.09 0.06 0.05
???? (?/?) ?? ?? ?? 0.11 0.09 0.08 0.05 0.03
???? (?/?) ?? ?? ?? 0.25 0.23 0.2 0.18 0.15
????(?/?) ?? ?? ?? 1.1707 1.1707 1.1707 1.1707 1.1707
????(?/?) ?? ?? ?? 1.5353 1.5353 1.5353 1.5353 1.5353
????(?/?) ?? ?? ?? 5 5 5 5 5
???? (?/??) lt50??? lt50??? lt50??? 0.005 0.0025 0.0013 0.0006 0.0003
???? (?/??) 50-100???(?) 50-100???(?) 50-100???(?) 0.0025 0.0013 0.0006 0.0003 0.00016
???? (?/??) gt100??? gt100??? gt100??? 0.0013 0.0006 0.0003 0.00016 0.00008
???? ???? ???? ???? mPro???mCool????? mPro???mCool????? mPro???mCool????? mPro???mCool????? mPro???mCool?????
47
???? ???? ???? 200??? 400??? 650??? ?????
???(?) (??????) ???(?) (??????) ???(?) (??????) 200 400 650 850
???? ???? ???? ???????? 24.4MB (?20???) ???????? 500MB (?410???) ???????? 5GB (?4,194???) ?????? ??????
???? (?/?) ??(? ???) ?? 0.07 0.0666 0.0633 0.06
???? (?/?) ??(? ???) ?? 0.06 0.0566 0.0533 0.05
???? (?/?) ?? ?? 0.1353 0.1279 0.1203 0.1128
???? (?/?) ?? ?? 0.1263 0.1194 0.1125 0.1056
???? (?/?) ?? ?? 0.11 0.1034 0.0966 0.09
???? (?/?) ?? ?? 0.09 0.087 0.086 0.08
???? (?/?) ?? ?? 0.23 0.22 0.21 0.20
????(?/KB) ????(?/KB) ????(?/KB) 0.0104?/KB (0.0013?/??) 0.0048?/KB (0.00006?/??) 0.004?/KB (0.00005?/??) -
????????(?) ????????(?) ????????(?) 1,500 1,100 950 -
48
?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ????? ????? ????? ????? ????? ????? ????? ????? ????? ????? ?? ??
??? 383 583 983 1683 165 365 465 765 600 1000 200 300 600 900 1500 301 401 601 801 901 386 586
?? (???) 3.6 3.0 1.8 1.8 4.8 4.8 4.8 3.0 4.8 4.8 0.9 0.9 0.9 0.9 0.9 4.8 4.8 4.2 3.0 0.9 4.8 4.2
?? (???) 9.0 7.5 6.9 63. 9.6 7.8 9.0 9.0 4.8 4.8 9.0 7.8 7.2 6.6 6.0 9.0 9.0 9.0 9.0 9.0 4.8 4.2
??? ??? (??) 5.4 4.8 3.0 1.8 9.6 9.6 9.6 9.6 9.6 9.6 7.2 7.2 6.0 5.4 4.8 7.2 7.2 6.0 5.4 5.4 7.2 6.6
??? ??? (??) 13.8 12 10.8 9.0 15 12 12 10.2 15 12 18 15 13.2 12 9.0 15 15 13.2 12 12 7.2 6.6
?? ?? (KB/?) 0.0048 0.02 0.0024 0.0104 0.00128 0.0048 0.00064 0.0024 0.00160.02 0.00160.02 0.00160.02 0.00160.02 0.00160.02 0.00160.02 0? 0? 0? 199? 199? 399? 399? 799? 799? 799? 0.04 0.04
?? ?? (KB/?) 0.0048 0.02 0.0024 0.0104 0.00128 0.0048 0.00064 0.0024 0.00160.02 0.00160.02 0.00160.02 0.00160.02 0.00160.02 0.00160.02 0.045 0.045 0.045 0.015 0.015 0.012 0.012 0.0075 0.0075 0.0075 0.04 0.04
49
???????
?(?)? ?(?)? ???? ???? ???? ???? ???? ???? ???? ???? ??
?(?)? ?(?)? ADSL FTTx CableModem LeasedLine PWLAN  ?? 3G?? WBA ??
101 ? 1? 2,101,257 2,340,230 1,019,119 23,870 54,158 5,538,634 17,615,555 133,616 23,287,805
2? 2,043,697 2,392,700 1,022,835 25,855 328,504 5,813,591 17,662,849 134,375 23,610,815
3? 2,005,275 2,436,425 1,027,724 25,668 339,079 5,834,171 17,687,274 135,400 23,656,845
4? 1,983,067 2,467,538 1,032,942 26,487 351,423 5,861,457 17,706,844 136,375 23,704,676
5? 1,958,261 2,491,030 1,040,395 26,533 451,787 5,968,006 17,739,561 136,704 23,844,271
6? 1,943,151 2,515,143 1,047,974 27,577 532,863 6,066,708 17,724,187 135,605 23,926,500
7? 1,919,954 2,536,506 1,054,934 27,885 620,038 6,159,317 17,713,974 135,430 24,008,721
8? 1,901,281 2,560,094 1,059,973 27,497 688,186 6,237,031 17,712,564 135,303 24,084,898
9? 1,879,835 2,580,528 1,065,926 27,479 746,542 6,300,310 17,686,337 135,643 24,122,290
http//www.ncc.gov.tw
50
?????????
????lt??gt???0??????????????(?????????) ????lt??gt???0??????????????(?????????) ????lt??gt???0??????????????(?????????) ????lt??gt???0??????????????(?????????) ????lt??gt???0??????????????(?????????) ????lt??gt???0??????????????(?????????) ????lt??gt???0??????????????(?????????) ????lt??gt???0??????????????(?????????) ????lt??gt???0??????????????(?????????)
??? ??? ???? ???? ???(101.09)?????? 101.09??? ??? ???????? ??????????
??? ?? 148826 96198 64.64 11817 12.28
??? ??? ?? 225285 73384 32.57 16165 22.03
??? 68409 30.37 17949 26.24
??? ???? 219572 68513 31.20 17065 24.91
?? 59180 26.95 14009 23.67
??? ?? 140354 16994 12.11 1351 7.95
?? 49617 35.35 6525 13.15
??? ??? 196523 111629 56.80 27077 24.26
??? ??? 233903 83009 35.49 20883 25.16
?? 58224 24.89 12776 21.94
??? ??? ??? 230602 148931 64.58 23209 15.58
??? ?? 285942 94461 33.04 47109 49.87
?????? 117477 41.08 62849 53.50
??? ??? 250171 47630 19.04 ???
??? 144619 57.81 20676 14.30
??? ?? 224153 80992 36.13 18070 22.31
??? 70886 31.62 3191 4.50
??? ??? 89474 56617 63.28 6765 11.95
??? ????? 136066 48331 35.52 3769
??? 45436 33.39 11356 24.99
??? ??? 108414 65363 60.29 9364 14.33
??? ?? 129869 92401 71.15 13312 14.41
??? ?? ??? 339773 112366 33.07 22559 20.08
?? 121181 35.67 18780 15.50
?? ??? 359567 238425 66.31 51075 21.42
??? ???? 148624 105358 70.89 18227 17.30
??? ?? 169624 114026 67.22 25064 21.98
??? ?? ?? 67132 45793 68.21 9942 21.71
?? ?? 110731 57322 51.77 7746 13.51
??? ???? ?? 399600 295853 74.04 70101 23.69
??? ??? 132120 78254 59.23 13972 17.85
??? ?? 187715 107143 57.08 21428 20.00
??? ?? 161469 58318 36.12 15641 26.82
?? 44333 27.46 7238 16.33
??? ?? 173900 79228 45.56 10816 13.65
??? ??? ??? 196973 105243 53.43 20486 19.47
??? ?? 174597 83315 47.72 14944
??? ??? ?? 139241 77991 56.01 6474 8.30
??? ?? 94999 34178 35.98 2645 7.74
??? ?? 96951 54811 56.53 13231 24.14
??? ??? ?? 82207 33489 40.74 8335 24.89
??? ?? 96982 39260 40.48 8104
??? ????? ??? 146295 105515 72.12 19690 18.66
????? ??? 130093 97526 74.97 18850 19.33
??? ??? 207829 139437 67.09 35892 25.74
??? ?? 170935 76902 44.99 15342 19.95
??? ????? ?? 348562 198284 56.89 16620 8.38
?? 38476 11.04 ???
????? ?? 249890 139257 55.73 11288 8.11
??? 18188 7.28 ???
??? ?? 180349 88490 49.07 ???
??? ?? 266513 165768 62.20 20747 12.52
??? ??? ?? 169022 91601 54.19 16997 18.56
??? ?? 111534 54356 48.73 9573 17.61
??? ??? ?????????????? ?????????????? 18450 5993 32.48 ???
??? ?????????????? ?????????????? 14722 3764 25.57 ???
??? ?? 48044 23253 48.40 161 0.69
??? ???????? ????????
??? ?? 158515 76676 48.37 9691 12.64
??? ??? ?? 83156 49216 59.19 312 0.63
??? ?? 39458 13970 35.40 ???
??? ?????????? ?????????? 35020 6396 18.26 ???
??? ?? 35635 17437 48.93 ???
??? ???????? ???????? 2295 875 38.13 ???
8167676 4995568 61.16 907258 18.16
  • 101?3??
  • ????5041259?
  • ?????8081433?
  • ???62.38
  • 101?9??
  • ????4995568?
  • ?????8167676?
  • ???61.16

http//www.ncc.gov.tw
51
Outline
52
GPS (Global Position System)
  • ???
  • 1958???
  • 1964?????
  • ?56????????
  • ????????13?
  • ????????

53
????GPS??
  • 1988???????????, 21?????3?????????30??6???????GPS?
    ?????????
  • GPS??
  • ????????????100???
  • ??????10???
  • 2000???,???????????????

54
GPS??
  • GPS??????????????????,???774kg,???7??????????,????
    ?,???1.5m?

55
GPS????
  • GPS?????????????????????,???????????????????????
  • ?????????????????????????????????????????????????,
    ???????
  • ??????????????????????????????????????

56
GPS????(cont.)
  • ?????????x?y?z?,???????t??????????????????,???4???
    ??4???????????????????????,???????4??????
  • ?????????????????????????

57
GPS??
  • ???? ???, ??????, ???...
  • ????????????????
  • ?? ?(??,??),??,??,?,????...
  • ?? ??, ?, ?, ??,??, ??...

58
GPS??
  • ???,?????????
  • ????(??98)
  • ?????????
  • ?????????
  • ????????
  • ??????

59
??????
  • ???GLONASS
  • 21??????3 ?????
  • ????GPS?,?????????GPS
  • ?????????
  • 38?????
  • ???????
  • ????????????
  • 2003 2??????1?????, ???????
  • 2012 10?????
  • 202030?????, ????

60
GPS ??????
  • GPS???????????????,???????????????
  • ?????????????

??????,? GDOP (Geometric Dilution of
Precision)???,?????????,????
61
Outline
62
RFID (Radio Frequency IDentification)
  • ??????????IC???????
  • ????,????????????????????
  • ???????????????
  • ????(125?134.2??)
  • ????(13.56??)
  • ?????(868?956??)
  • ????(2.45GHz)

63
RFID v.s. BarCode
  • RFID??????,?
  • ????????
  • ??????
  • ?????
  • ??????????????
  • ??????????

64
RFID ??
  • ?????????
  • ???????(????, ?key)
  • ??????,????
  • ?????????
  • ?????????
  • ????
  • ??www.rtc.itri.org.tw

An RFID tag used for electronic toll collection
65
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