IEEE ZigBee 2.4GHz 250kbps O-QPSK DSSS Bluetooth IEEE GHz 3Mbps G-FSK FHSS PC LAN IEEE b 2.4GHz 11Mbps CCK DSSS LAN LAN IEE

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5 years ago
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1 SMK SMK Corporation Kenji OTSUKA AV AV RF 2.4GHz ISM 2.4GHz ISM 2.4GHz RF

2 IEEE ZigBee 2.4GHz 250kbps O-QPSK DSSS Bluetooth IEEE GHz 3Mbps G-FSK FHSS PC LAN IEEE b 2.4GHz 11Mbps CCK DSSS LAN LAN IEEE g 2.4GHz 54Mbps 64QAM OFDM LAN 2.4GHz ISM Industry-Science-Medical ISM FCC Part.15 RF LAN Bluetooth ZigBee IEEE ISM RF RF 1 A 2 100ms 1 µa 2 100ms 300ms

3 1 W e PL = W W 2 R T T at ar T A A W λ G G W = = d λ 16π d T 4πd 1 λ G G e at ar db 3 2 d PL [ db] = 10 4π log ( logg G... 3 at log ar ) λ d 1 2 d 1 PL0 = 2 π = jk l π λ exp( ) λ 2 k l sin 2 k=2π /λ l>λ/2 d 4 sin0.5 5 d PL0 = π λ d l 16 PL d b 0 4 d hh t r hh t > 2 2π λ r h t d h r W T W A T m 2 2G a / 4 (m) A R m 2 PL G at G ar W e W m h t h r m d m l m d b = m

4 RF 1% 2.45GHz 3 PL = 0 ( 85) + ( 2) + ( 1) 2 3= 77[ db] 20log dm [ ] = PL = = dm [ ] = 10 = 69. 0[ m] 7 d b =71.5m W T =0 dbm W R = 85 dbm 1% G T = 2 dbi G R = 1 dbi h t =h r =1 m RF 2 db RF 3 db 2.45GHz 2.4GHz ISM 1 2 db m l 1 d l> /2

5 GHz ISM ASK : amplitude shift keyingfsk : frequency shift keying ISM FHSS : Frequency Hopping Spread Spectrum DSSS : Direct Sequence Spread Spectrum ASK FSK FHSS Bluetooth IEEE DSSS LAN IEEE802.11b IEEE ZigBee QPSK 1 PA

PNPN DSSS 8 G p =... 8 8 SN = S/N S/N BW RF R info S M = G L + ( ) N j p sys out.

6 PNPN DSSS 8 G p = SN = S/N S/N BW RF R info S M = G L + ( ) N j p sys out... 9 L sys (S/N) out SN RF (BW RF )=2MHz (R info )=250kbps 1% (S/N) out =6dB IEEE L sys =3dB9 f f f

7 10 M j = 10log ( 3[ db] + 6[ db]) = 0[ db] % FHSS Bluetooth Bluetooth s FHSS Bluetooth DSSS IEEE Bluetooth ms µa 6 3 DSSS IEEE RF IEEE RF LAN LAN LAN.11b Ch14 LAN Ch1 Ch6 Ch11 LAN LAN IEEE Ch15 Ch20 Ch25 Ch26 LAN IEEE CCA : clear channel assessment CCA

8 ARIB STD-T MHz MHz RCR STD MHz 2497MHz 22MHz Ch1 Ch2 Ch13 Ch14 Ch14 11b 25MHz 25MHz Ch1 Ch6 Ch11 Ch IEEE MHz 5MHz LAN MHz 50MHz 2450MHz 10 Bluetooth

LAN Ch1 IEEE 802.15.4 Ch15 Bluetooth 2.4000 2.4835GHz 1MHz625µs 79 RF 49.4ms Payload data 8byte Bluetooth RF 11 RFBluetooth 49.4ms 50 150ms IEEE 802.15.4 byte Payload data byte18byte 250kbps11 576µs byte8 =.

9 LAN Ch1 IEEE Ch15 Bluetooth GHz 1MHz625µs 79 RF 49.4ms Payload data 8byte Bluetooth RF 11 RFBluetooth 49.4ms ms IEEE byte Payload data byte18byte 250kbps11 576µs byte8 = bps IEEE Ch11 Bluetooth MHz 2405MHz 2406MHz Bluetooth RF ms Bluetooth 3 IEEE

10 625 s Bluetooth 625 s ms IEEE s 2MHz 4.96 Bluetooth IEEE Ch % % CCA 13 on6.283ms

11 PER 5m RF off3.792ms 576µs 68.1% CCA CCA PER 1 5m W 2r 3 RFFC8602T 2405MHz 2450MHz 2480MHz PER RF PER 18byte 5 14

12 PER PER1 % 2405MHz5m 2480MHz1 RF 1% MHz Ch m y 2405MHz 2450MHz 2480MHz 0m 17% 76% 2% 1m 10% 58% 0% 2m 5% 50% 0% 3m 3% 45% 0% 4m 3% 41% 0% 5m 0% 35% 0% 2405MHz Ch11 5m 2480MHz Ch26 1m RF LAN Bluetooth 1% ISM ISM LAN Bluetooth CCA Ch11 Ch26

RF IEEE 802.15.4 Robert C. Dixon Bluetooth ZigBee 2.1 3.6V 10 +50 42mAtyp. / 5 Atyp. at 252.

13 RF IEEE Robert C. Dixon Bluetooth ZigBee V mAtyp. / 5 Atyp. at 252.7V URAT 19200bps PWM IR 2.5mm mm O-QPSK DSSS 20 MHz m Offset- Quadrature Phase Shift Keying Direct Sequence Spread Spectrum

デジタル通信を支える無線技術

デジタル通信を支える無線技術 Aug. 02, 2008 Copyright 2008 Niigata Internet SOCiety & I.Suzuki All Rights Reserved. 2 1. LAN 2. 3. LAN 4. 802.11 3 4 1. LAN 2. 3. LAN 4. 802.11 5 WMAN 50Km WiMax WLAN 100m 802.11 WPAN 10m ZigBee Bluetooth