1. Department of Communications Engineering
Communication Theory
Prof. Deli Qiao
Department of Communications Engineering

2. Instructor Information
Office: 245
Web:
Phone:
Office Hours: Mon. & Fri. 0:30pm~1:30pm

3. Textbook
J. Proakis
樊昌信改编

4. Reading Materials
通信原理（Principles of Communications）, Lecture Notes, Prof. Meixia Tao, Shanghai Jiao Tong University.[
Introduction to analog and digital communications, Lecture Notes, Ohio State University. [

5. Course Objective The primary objective of this course is
to introduce the basic techniques used in modern communication systems, and
to provide fundamental tools and methodologies in analysis and design of these systems
After this course, the students are expected to
understand the information flow in communication systems and the theories and techniques of modulation, coding and transmission, and
analyze the merits and demerits of current communication systems and to eventually perform research and development (R&D) related to new systems

6. Outline
Introduction
Signal, random variable, random process and spectra
Analog modulation
Analog to digital conversion
Digital transmission through baseband channels
Signal space representation
Optimal receivers
Digital modulation techniques
Channel coding
Synchronization
Information theory*

7. Grades Quiz (15%) About 10-15 times, each one and only one problem.
Homework (15%)
About 4-7 times, including Matlab simulation problems.
Mid-term Exam (20%)
In-class open book.
Final Exam (50%)

8. In-Class Rules Shutdown smartphone and donot put on desk!
No food/drink in class and put your drinking bottle aside the desk!
No mutual conversation !
Prepare, make notes and review frequently!
Practice makes perfect!

9. Maxim (格言)

10. Outline
Introduction
Signal, random variable, random process and spectra
Analog modulation
Analog to digital conversion
Digital transmission through baseband channels
Signal space representation
Optimal receivers
Digital modulation techniques
Channel coding
Synchronization
Information theory

11. Introduction
The fundamental problem of communication is that of reproducing at one point either exactly or approximately a message selected at another point.
---Claude E. Shannon 1948

12. Introduction 1909 Nobel Prize Historic signal (smoke, flag, horn)
After electricity
1838: telegraph (S. Morse)
1876: telephone (A. Bell)
1863: electromagnetic wave (J. Maxwell, found 1887 by Hertz)
1895: radio (G. Marconi)
1901: transatlantic transmissions (Marconi, 2200 miles)
1909 Nobel Prize

13. Introduction Early 20th century
Most communication systems including the early version of cellular systems developed in 1940s are analog.
Engineering designs are ad-hoc, tailored for each specific application.

14. Modern Communication Systems
Introduction
Modern Communication Systems

15. Introduction General questions
Is there a general methodology for designing communication systems?
Is there a limit to how fast one can communicate?

16. Introduction

17. Introduction

18. Introduction
System diagram

19. Introduction

20. Introduction

21. Introduction

22. Introduction
Wireless channel free-space propagation

23. Introduction The additive noise channel
Linear time-invariant (LTI) filter channel

24. Introduction
Linear time-variant filter channel
A multi-path channel

25. Introduction Analog communication systems
Digital communication systems

26. Introduction

27. Introduction

28. Introduction Why digital systems?
Robustness to channel noise and external interference
Security of information during its transmission from source to destination
Integration of diverse source information into a common format
Low cost DSP chips by very cheap VLSI designs

29. Introduction Performance metrics of communication systems
Reliability: SNR for analog; Bit error rate (BER) for digital
Efficiency: Spectral efficiency vs. Energy efficiency