|
Contents
of the course
Introduction. Analog signal transmission and reception. Amplitude
modulation, Double side band supressed carrier amplitude modulation,
single side band amplitude modulation, quadrature amplitude
modulation, vestigial side band modulation. Frequency Division
Multiplexing. Frequency modulation. Phase modulation. Radio and
television broadcasting. Random processes. Effect of noise on analog
communication systems. Pulse amplitude modulation, pulse width
modulation, pulse position modulation, pulse code modulation,
differential pulse code modulation, delta modulation. Time division
multiplexing. Information theory and source coding. Digital
modulation: on-off keying, binary phase shift keying, differential
phase shift keying, frequency shift keying, quadrature phase shift
keying, M ary phase shift keying, orthogonal quadrature phase shift
keying, minimum shift keying, Gaussian minimum shift keying,
orthogonal frequency division multiplexing. Channel capacity and
coding. Channel coding. Introduction to wireless communications.
Spread spectrum communication systems. Digital cellular
communication systems. Recent developments in communications.
Objectives of the course
The objective of
this course is to give the third year electrical and electronics
engineering students a fundamental knowledge of the scientific and
technological principles behind analog and digital communication
systems, and to gain them modeling, mathematical analysing and
sentezing ability of communication systems. During the course,
analog and digital modulations, signal transmission, noise analysis,
information theory and coding techniques are studied and todays
communication systems are introduced. Students will confirmate of
their theoretical knowledge by computer simulations using MATLAB.
Year/Semester:
3rd
year Spring
Semester
Status:
Compulsory
Department:
Electrical and Electronics
Engineering
Prerequisite/Recommended: ELK 207 Signals and
Systems.
Form of
Teaching: Lectures (56 Hours)-4 hours per week
Lecturer: Assoc. Prof. Dr. Ali GANGAL
Language of instruction: Turkish
Lesson Hours: Monday 13-15,
Tuesday 13-15
Textbook/material: Power
point presentation
Lecture notes:
To be delivered during the lectures.
Method of assessment:A
written midterm exam (30%), quizzes and practical homeworks (20%)
and a written end-of-term exam (50%)
Make-up Policy
Only one make-up examination will be given to those who miss any of
the midterms or the final. The student who
wishes to take the make-up exam must provide a valid excuse after
the missed exam.
NG Policy
NG grade will be given to students who do not attend more than 70%
of the course lecture hours, miss the exams and fail.
Course Outline
1.
Introduction
2.
Analog Signal Transmission and Reception
2.1. Amplitude Modulation (AM)
Double Side
Band AM (DSB AM):
Modulation index, Spectrum of an AM signal, overmodulation and
envelope distortion, power of AM signal, modulation efficiency,
modulators, envelope detection, demodulators, practical modulator
circuits. Suppressed
Carrier AM (DSB-SC AM):
Modulators, balanced modulators, demodulators, ring demodulator.
Single
Side Band Modulation (SSB AM): SSB
with filtering, SSB with phase shift, Hilbert transform, modulators
and demodulators.
Vestigial Sideband Modulation (VSB). Quadrature Amplitude Modulation
(QAM). Frequency Division Multiplexing (FDM).
2.2. Angle Modulation
Representation of Frequency modulation
(FM) and Phase Modulation (PM) Signals, Spectral characteristics of
angle modulated signals, implementation of angle modulators and
demodulators.
2.3. Radio and Television Broadcasting
AM radio broadcasting, FM radio
broadcasting, Television broadcasting, mobile radio systems.
3. Random Processes
Description of random processes, statistical averages,
stationary processes, random processes and linear systems, random
processes in the frequency domain, Correlation functions, energy
spectral density, power spectral density, Parseval theorem, Gaussian
and white processes, bandpass processes, Wiener-Khintchine theorem.
Mathematical representation of Noise:
white noise, auto correlation function of noise, spectral components
of noise, bandpass white noise, noise equivalent bandwidth,
quadrature components of noise. Matched filters.
4. Effect of Noise on Analog Communication Systems
Effect of noise on Linear Modulation systems:
Effect of noise on a baseband system, Effect of noise on DSB-SC AM,
effect of noise on conventionalAM, effect of noise on SSB AM.
Effect of noise on Angle Modulation.
Threshold effect in angle modulation, pre-emphasis and de-emphasis
filtering. Comparison of analog modulation systems. Effect of transmission losses and noise in analog
communication systems.
5. Pulse
Modulation
Sampling
Theorem,
Pulse
Amplitude Modulation (PAM), Pulse Width Modulation (PWM), Pulse
Position Modulation (PPM),
noise in pulse modulation, Pulse Code
Modulation (PCM),
Quantization noise, nonuniform quantization, companding, expanding,
PCM bandwidth, practical PCM circuits. Differential
Pulse Code Modulation (DPCM).
Binary signaling formats, line codes, Eye pattern, Delta
modulation (DM), Adaptive Delta Modulation (ADM), Time Division
multiplexing (TDM).
6.
Information Theory and Source Coding
Entropy,
information rate, Shannon theorem, channel capacity. Shannon Fano
coding, Huffman coding, Lempel-Ziv coding.
7. Digital
Modulation
On-Off
Keying (OOK), Binary-Phase-Shift Keying (BPSK), Differential Phase
Shift Keying (DPSK), Frequency-Shift Keying (FSK), Quadrature Phase-shift
Keying (QPSK), M-ary Phase-Shift Keying (MPSK), Offset Quadrature
PSK (OQPSK), p/4
QPSK, Minimum Shift-Keying (MSK), Gaussian-filtered MSK (GMSK),
Tamed Frequency Modulation (TFM). Multicarrier modulation and
Orthogonal Frequency Division Multiplexing (OFDM).
8. Channel
Capacity and Coding
Channel
capacity, bounds on communication, coding for reliable communication,
linear block codes, cyclic codes, convolutional codes,
complex codes
based on combination of simple codes:
product codes, concatenated codes, turbo codes. Trellis coded
modulation. Practical applications of coding.
9. Wireless
Communications
Digital
transmission on fading multipath channels,
equalization, the RAKE demodulator, Continuous carrier-phase
modulation (CPFSK), Continuous-phase modulation (CPM), Spread
Spectrum communication Systems: Direct
sequence concept, code division multiple access (CDMA), frequency
hopping concept, code generation,
intersymbol interference, spread spectrum interference analysis.
Digital cellular communication systems:
the GSM system, CDMA system.
|
