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

 Source coding methods  Channel coding methods  Data Compression  Data Encryption  Channelization Protocols  Random Access Protocols  Control Access Protocols M.Sc. in IT - Year 1 Semester II

 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

 Haffman coding  Shannon coding  Arithmetic coding M.Sc. in IT - Year 1 Semester II

 Forward Error Correction  Backward Error Correction  Hybrid Error Correction  combination of backward and forward error correction M.Sc. in IT - Year 1 Semester II

Source codingChannel coding Convert to signal Line coding

 Audio compression-MP3  Image compression-JPEG  Video compression-MPEG M.Sc. in IT - Year 1 Semester II

 Eg:- method colombo e q n q o d colombo  DES  RSA M.Sc. in IT - Year 1 Semester II

 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

 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

 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