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Introduction Wireless Network
Politeknik Telkom 2008
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comprehension
Wireless Communication System :Radio frequencyInformation transmission (video, voice,
picture, data)Limited by bandwidthInterference
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Anvantages of wireless
Mobility Simple setupLow costScalability
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Wireless Communication
Fixed services:BluetoothWiFiWIMAXRFID
Mobile services:Limited Mobility (Flexi)Cellular (GSM, CDMA, 3G)
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Type of Wireless Technology
Degree of mobility
Sta
ndin
gW
alki
ngD
rivin
g
User data rate10 Mbps
IEEE802.16a,d
1 100
HSDPA
IEEE802.16e
WLAN(IEEE 802.11x)
GSMGPRS
DECT
EDGE
FlashOFDM (802.20)
Systems beyond 3G >2010
0.1
BlueTooth
UMTS
CDMA
EV-DOEV-DV
UMTS
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IEEE
IEEE (Institute of Electrical and Electronic Engineers)
IEEE :
- discussion
- research
- development
for network technology
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standart IEEE
IEEE 802.8 Fiber Optic LAN & MAN (standart FDDI)
IEEE 802.10 LAN/MAN security (VPN)IEEE 802.11Wireless LAN (WiFi)IEEE 802.15Wireless PAN (Personal
Area Network) bluetoothIEEE 802.16Broadband Wireless Access
(WiMax)
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Content vs Bandwidth
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Trade off Wireless Communication
Maximum bit rateMinimum errorMinimum powerMinimum bandwidthMaximum system utilityMinimum complexityMinimum cost
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Wireless Performance
Range (coverage)Power (daya yang digunakan)MobilityBandwidthData rate
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Multiple Access Technology
FDMATDMACDMA
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FDMA (FREQUENCY DIVISION MULTIPLE ACCESS)
advantages :simpleWithout network timing
Kekurangan : Intermodulation noiseLow spectrum efficiency
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FDMA
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TDMA
Kelebihan :High spectrum efficiencyWithout power control
Kekurangan :Need synchronization
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TDMA
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CDMA
Kelebihan :High spectrum efficiencyHigh capacitysecure
kekurangan :Need power control
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CDMA
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Perkembangan teknologi wireless