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

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

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.

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

Haffman codingShannon codingArithmetic coding

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

Forward Error CorrectionBackward Error CorrectionHybrid Error Correction

combination of backward and forward error correction

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

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

Source codingChannel coding

Convert to signal

Line coding

Audio compression-MP3 Image compression-JPEGVideo compression-MPEG

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

Eg:- method colombo e q n q o d

colomboDESRSA

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

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

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

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

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

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

Eg: Reservation Polling Token Passing

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

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