-
8/12/2019 DC Lecture1
1/19
Digital Communications
EE 725Instructor: Dr. Aamir Habib
[email protected] [email protected]
mailto:[email protected]:[email protected]:[email protected]:[email protected]
-
8/12/2019 DC Lecture1
2/19
Introduction of the InstructorPhD from Vienna University of
Technology
in Electrical Engineering
-
8/12/2019 DC Lecture1
3/19
Course Objective This course is designed to prepare students
for
engineering work in the industry and for advancedgraduate work
in the area of digital
communications.
The course covers concepts and useful tools fordesign and
performance analysis of transmittersand receivers in the physical
layer of acommunication system.
-
8/12/2019 DC Lecture1
4/19
-
8/12/2019 DC Lecture1
5/19
Prerequisites
Required: Signals and Systems
Recommended:Probability and Stochastic Processes
-
8/12/2019 DC Lecture1
6/19
Communication Main purpose of communication is to
transfer information from a source to arecipient via a channel
or medium.
Basic block diagram of a communicationsystem:
Source Transmitter Receiver RecipientChannel
-
8/12/2019 DC Lecture1
7/19
Brief Description
Source: analog or digital Transmitter: transducer, amplifier,
modulator,
oscillator, power amp., antenna Channel: e.g. cable, optical
fibre, free space Receiver: antenna, amplifier, demodulator,
oscillator, power amplifier, transducer Recipient: e.g. person,
(loud) speaker, computer
-
8/12/2019 DC Lecture1
8/19
Types of information
Voice, data, video, music, email etc.
Types of communication systems
Public Switched Telephone Network (voice,fax,modem)Satellite
systemsRadio,TV broadcastingCellular phonesComputer networks (LANs,
WANs, WLANs)Radars/EW (ECM, ECCM)
-
8/12/2019 DC Lecture1
9/19
-
8/12/2019 DC Lecture1
10/19
Why digital? Digital techniques need to distinguish between
discrete symbols allowing regeneration versusamplification
Good processing techniques are available for digitalsignals,
such as
- Data compression (or source coding)- Error Correction (or
channel coding)
- Equalization- Security
Easy to mix signals and data using digital techniques
-
8/12/2019 DC Lecture1
11/19
-
8/12/2019 DC Lecture1
12/19
-
8/12/2019 DC Lecture1
13/19
-
8/12/2019 DC Lecture1
14/19
-
8/12/2019 DC Lecture1
15/19
-
8/12/2019 DC Lecture1
16/19
-
8/12/2019 DC Lecture1
17/19
Main Points
Transmitters modulate analog messages or bits incase of a DCS
for transmission over a channel.
Receivers recreate signals or bits from received signal(mitigate
channel effects)
Performance metric for analog systems is fidelity, for
digital it is the bit rate and error probability.
-
8/12/2019 DC Lecture1
18/19
Signal and Spectra Formatting and Baseband Modulation Baseband
Demodulation/Detection Bandpass Modulation and
Demodulation/Detection Link Budget Analysis Synchronization Source
Coding
Channel Coding Spread Spectrum Techniques Fading Channels
Course Outline
-
8/12/2019 DC Lecture1
19/19
Assignments: 15% Project/Research Paper 15% Quizzes 15% Hour
Exams : 20% Final Exam: 35%
Tue -1800 to 2100
Tentative Grading Policy
