EE3-03 Communication SystemsLecturer(s): Prof Thanassis Manikas
1) To provide the foundations of a typical Digital Communication System (DCS), and overviewing its operation.
2) To define the main performance criteria for DCS and associated parameter planes, with emphasis given to the Energy Utilisation Efficiency and Bandwidth Utilisation Efficiency.
3) To identify the theoretical limits in the performance of DCS
4) To highlight system trade-offs
5) to extend a conventional DCS to a spread spectrum system
To understand/learn the functionality and analyse the behaviour of Digital Communication Systems (DCS) by 1) identifying their main blocks and basic parameters and 2) modelling the associated signals.
COMMUNICATION SOURCES & CHANNELS: modelling of communication sources and communication channels, measures of information, Gaussian sources and channels, etc.
PERFORMANCE CRITERIA & LIMITS: introductory concepts, Energy Utilisation Efficiency (EUE), Bandwidth Utilisation Efficiency (BUE), bandwidth expansion factor, signal-to-noise power ration (SNR), probability of error. Shannon's threshold capacity curve, theoretical limits on performance of digital communication systems and the concept of an ideal communication system. The (Pe/SNR, EUE, BUE) parameter planes. Representations of the major communication systems on the parameter planes. Comments, comparisons and disucssions. Shannon's first coding theorem, Channel capacity. Shannon's second coding theorem.
CONSTELLATION DIAGRAM & LINE CODES.
SPREAD SPECTRUM SYSTEMS (SSS): Basic concepts and parameters. PN-codes. Classification and modelling of jammers. Modelling of BPSK and QPSK Direct Sequence SSS in a jamming environment, estimation of SNIR and bit-error-probability. Direct sequence SSS on the (SNR/pe, EUE,BUE) parameter plane. Frequency Hopping SSS.
PRINCIPLES OF MULTIPLEXING, PCM and PSTN:using concepts and analytical tools presented in the previous topics, the examination of multiplexing and PSTN will be presented, based on the CCITT recommendations for PCM and the associated digital hierarchy. This will include maximum-SNR-non-uniform quantisers, A-law and mu-law compaders, differential quantisers, basic concepts of differential PCM.
100% on 3-hour exam in early Spring Term
Coursework contribution: 0%
Closed or Open Book (end of year exam): Closed
Assessed problem sheets
Oral Exam Required (as final assessment): no
Prerequisite: None required
Course Homepage: http://skynet.ee.ic.ac.uk/notes/notes.html