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1 Selected Topics in Telecommunication Engineering I
504460
15 2558 .
State of the Art
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3
(Radio Transmission)
( Band pass channel)
Voice Data
link
() (156-162 MHz) link
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(Microwave Transmission)
SNR
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(Infrared and Millimeter
Waves)
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(Lightwave Transmission)
link
license
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WLANs
(PANs)
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Reuse channels
()
Base stations/Mobile Telephone Switching Offices (MTSOs) handoff
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link
WLANs!
!
WLANs 100
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one way communication (TV, GPS)
base station
Iridium, Globalstar, Inmarsat12
(PANs) Bluetooth
RF ()
(10 )
2.4 GHz band
1 Data (700 kbps) and 3
1 Mbps data rate 7
TDD duplex
Polling based multiple access
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1. Ad hoc network
2. Wireless Sensor Networks
3. Distributed Control Network
4. Ultra Wide Band (UWB) systems
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1. Ad hoc
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1. Ad hoc Peer to peer communications
No backbone infrastructure
Routing can be multihop
Topology is dynamic
Fully connected with different link SINRs16
1. Ad-Hoc networks Adhoc networks Provide a flexible network infrastructure for many
emerging applications
The capacity of such network is generally unknown
Transmission, access and routing strategies for these networks are generally ad-hoc
Crosslayer design critical and very challenging
Energy constraints impose interesting design tradeoffs for communication and networking
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2. Wireless Sensor Networks
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Wireless Sensor network
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2. Wireless Sensor Network Nodes powered by non-rechargeable batteries
Data flows to centralized location
Low per-node rated but up to 100,000 nodes
Data highly correlated in time and space
Nodes can cooperate in transmission, reception, compression and signal processing
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3. Distributed Control Network DCS(Distributed Control System) (Control) (monitor)
packet loss delay time
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link
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3. Distributed Control Network link
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3. Distributed Control Network
4. Ultra Wide Band Systems UWB 100 Mb/s (Up to 1000 Mb/s)
UWB ultra-low power radio signal with very narrow pulses (nanosecond)
UWB
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4. UWB
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