Transcription of Wireless Communications and Networks
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Wireless Communications and Networks
1 MITW ireless Communications and NetworksMuriel Medard2 MITWhen do we use codes Two different types of codes: source codes: compression channel codes: error-correction Source-channel separation theorem says the two can bedone independently for a large family of channelsSourceencoderChannelencoderChann el decoderstreamModulator, channel, receiver, The physical layer Wireless telephony: FDMA TDMA CDMA UWB 3G Wireless networking: Bluetooth Ad hoc networks4 MITP hysical layer The physical layer plays a very important role in wirelessnetwork because it has severe limitation on transmissionsUplink with respect to downlink is more restricted:-more multiple access interference-more restrictions on power because of battery use and because or user safety-more decentralized problem uplinkdownlinkBase station5 MITThe cellular systemThe area of coverage ofDifferent base stations islogically a tessellation ofthe spaceW
Wireless Communications and Networks Muriel Medard. MIT 2 When do we use codes •Two different types of codes: –source codes: compression –channel codes: error-correction –Source-channel separation theorem says the two can be done independently for a large family of channels Source encoder Channel encoder
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