Download - Digital Transmission Lecture o4 Advanced Computer Networks (ACN) 545

Mr. Thilak de Silva.BSc. Eng., MSc, CEng, FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA)

M.Sc. in IT - Year 1 Semester II - 2012

Source coding methodsChannel coding methodsData CompressionData EncryptionChannelization ProtocolsRandom Access ProtocolsControl Access Protocols


At the end of this session you will have a basic understanding of source and channel coding methods, data compression and encryption, Channelization Protocols , Random Access Protocols and Control Access Protocols.


Haffman codingShannon codingArithmetic coding


Forward Error CorrectionBackward Error CorrectionHybrid Error Correction

combination of backward and forward error correction



Source codingChannel coding

Convert to signal

Line coding

Audio compression-MP3 Image compression-JPEGVideo compression-MPEG


Eg:- method colombo e q n q o d

colomboDESRSA


Channelization is a multiple access method in which the available bandwidth of the link is shared in time, frequency or through code between different stations.

Eg:- Frequency Division Multiple Access – FDMA Time Division Multiple Access – TDMA Code Division Multiple Access – CDMA


Random Access means each station has the right to the medium without being controlled by any other station.

Eg: ALOHA Slotted ALOHA CSMA/CD CSMA/CA


Control access means the stations consult one another to find which station has the right to transmit.

Eg: Reservation Polling Token Passing


Download - Digital Transmission Lecture o4 Advanced Computer Networks (ACN) 545

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