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

license

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4. UWB

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