Digital Transmission Lecture o3 Advanced Computer Networks (ACN) 545
Digital Transmission Lecture o4 Advanced Computer Networks (ACN) 545
description
Transcript of 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
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