Communication Engineering

LecturerMasaaki KATAYAMA, Professor
DepartmentSchool of Engineering / Graduate School of Engineering, 2011 Fall
Recommended for:undergraduate students of Electrical and Electronic Engineering Course (21.5 Hrs. / session 1 session / week 15 weeks / semester)

Communication Engineering

Course Contents

Analog and digital wireless systems constitute important infrastructure of our society. Analog wireless systems have been in use for many years for radio and television broadcasting, while digital data transmission systems are used for high-tech devices such as digital terrestrial/satellite broadcasting systems, mobile phones, computers connected to wireless LAN, etc. This lecture introduces basics of such radio transmission technologies for many kinds of information such as voice, video.

Main objective of the lecture is to understand the process of carrying information by the radio wave, i.e. modulation and demodulation. In addition, we will be learning about the multiple accesses, or a technology to share the same communication channel or physical media with several data streams or signals. CDMA is one of the examples of multiple accessing technologies used for mobile phone.

Key Features

In this lecture, many homeworks and exercises will be given. For this reason, students may feel that this course will be a tough one. Your questions in the lecture or by e-mail messages after the class are always welcome.

Course Aims

In this lecture we will be learning about the basics of wireless communication systems. In particular we will be focusing on mathematical representations of radio signals, modulation and demodulation procedures, and multiple access schemes. Exercise problems will be given for your better understanding.

Objectives of this lecture are to understand following.

  1. Mathematical representations of radio signals. Difference and frequency spectra of deterministic signals, and random or stochastic signals.
  • Analog modulation and demodulation schemes.
  • Digital modulation and demodulation schemes

Basics of calculus, stochastic process and complex function theory are required. We will review some of these mathematical methods in some part of the lecture.


This lecture is designed for Electrical and Electronic Engineering students and Information Engineering senior students to get the fundamental understanding of radio transmission system. This lecture is only an introductory level course for the radio transmission techniques. More advanced material such as analysis of radio transmission error detection and correction will be on the graduate level course.


No textbooks are assigned. Handouts (50 pages long) will be given and used in the lecture.

John G. Proakis, Digital Communications, McGraw Hill

Other books will be notified by the instructor.

Students Accomplishments

Accomplishments given in 2005

Note: All files are in Japanese

Course Schedule

Session Content
1 Chapter 1 Basics of radio transmission system
- Characteristics of wireless transmission systems and comparisons with wire communication systems.
- Main constituents of wireless transmission systems.
2 Chapter 2 Deterministic signal and frequency spectrum
- Understanding of deterministic signal and indeterministic signal.
- Review on Fourier series expansion
3 Chapter 2 Deterministic signal and frequency spectrum continued
- Fourier transform of Continuous deterministic function
- Basic understanding of Fourier transform
4 Chapter 2 Deterministic signal and frequency spectrum continued
- Mathematical representation of narrowband signal and linear time invariant system
5 Chapter 3 Basics of modulation
- What is modulation?
- Classification of modulation schemes
6 Chapter 4 Analog modulation
- Modulation and demodulation methods of AM, DSB, SSB and VSB signals.
7 Chapter 4 Analog modulation continued
- Modulation and demodulation method of phase modulated signals and frequency modulated signals
- Relations of these two signals.
8 Exercise
- Quiz on the material from Chapter 1 to Chapter 4
9 Chapter 5 Auto-correlation function and its Fourier transform
- Auto-correlation function and its application on the indeterministic signal and deterministic signal
- Meaning of the Fourier transform of auto-correlation function and power density spectrum.
10 Chapter 6 Linear digital modulation method
- Relation between waveform and spectrum of linear digital modulation
11 Chapter 6 Linear digital modulation method continued
- Receiving method of digitally modulated signal
- Comparisons of various linear digital modulation method
12 Chapter 6 Linear digital modulation method continued
- Constant envelope modulated signal
13 Chapter 7 Digital FM and OFDM
- Modulation and demodulation method of digital FM signal
- MSK and relation between FM and linear digital modulation
- OFDM which is used for wireless LAN and digital terrestrial television

OFDM involves complicated manipulation, which is unable to explain in classical physics, and it is worth studying in this lecture.
14 Chapter 8 Spectrum diffusion
- Spread spectrum technique that are used commonly in mobile phone or in wireless network system
15 Chapter 9 Multiple accessing techniques
- Technology of sharing the same communication channels or physical media with several data streams or signals

Lecture Handouts

Note: All files are in Japanese

1st Lecture

2nd to 4th lecture

5th lecture

6th to 7th lecture

9th lecture

10th to 12th lecture

13th lecture

14th lecture

15th lecture


  • Students are required to achieve objectives written in course aim.
  • Evaluation will be given based on Midterm exam (40%), Final term exam (40%), exercise (20%).
  • It is required to get more than 55% to get credits from this course.

Last updated

May 13, 2020