In less than three decades, the status of cellular telephones has moved from laboratory breadboard via curious luxury item to the world's most pervasive consumer electronics product. Even though wired telephony is 100 years older and the beneficiary of "universal service" policies in developed countries, the number of cellular phones has exceeded wired phones for a few years and the difference keeps growing. For hundreds of millions of people in developing countries, cellular communications is the only form of telephony they have experienced.


This course provides an introduction to mobile communications system principles, design and technology. It also covers state-of-the-art topics such as LTE (SC-FDMA).


  • Information regarding final exam
    • Date: 6 Mar 2013
    • TIME: 09:00 - 12:00
    • ROOM BKD 2501-2
    • Cover all the materials that we discussed in class and practice in the HWs&Quizzes.
    • These notes are provided for your studying pleasure....
    • Information from the first draft of the exam:
      • 10 Pages + 1 Cover page
      • Formula sheet: To be distributed in the exam room
      • 12 Questions
      • Material distribution (roughly):
        • Ch 3: 15%; Ch 4: 50%; Ch 5 25%; Ch6: 10%
    • On Mar 5, Dr.Prapun will be in his office in the morning and after 3PM to answer any question concerning the exam.
    • Check this site regularly for more details on the final exam.
  • Starting Jan 21, we will have two lectures on Monday (9-12PM) and no class on Wednesday.
  • Information regarding midterm exam
    • Date: 19 Dec 2012
    • TIME: 09:00 - 12:00
    • ROOM: BKD 3207
    • Closed book. Closed notes. No cheat/study sheet.
    • Basic calculator needed.
    • 9 Pages. 10 Questions. + 2 Extra-Credit Quesions.
    • Cover page
    • Rough Distribution of Material:
      • 40% on Ch1 with strong emphasis on Section 1.3
      • 60% on Ch2. (2.1, 2.2, 2.4 approximately 15-20% each; 2.3 approximately 10%)
    • Cover all the materials that we discussed in class and practice in the HWs.
    • Office hours during the midterm week: Monday (all day) and Tuesday Morning
      • I'm usually in my office until 5:30PM. So, for those who are not relying on the institution bus, you may visit my office after 4PM as well.
  • No class on Dec 28. Makeup class on Dec 3. (We will have ECS455 on both the first and second periods.)
  • Welcome to ECS455! Feel free to look around this site.
  • A basic RSS feed is created to track and inform updates

General Information

  • Instructor: Dr. Prapun Suksompong (
  • Official Office Hours
    • Location: BKD3601-7
      • Time: Wednesday 9:20-11:20
    • Location: Library (Rangsit)
      • Time: Monday 16:20-16:50
    • Please feel free to ask any question or express any concern after class.
  • Course Syllabus [Updated at 12:30 PM on Nov 7]
  • Class information
  • Main Textbook: D. Tse and P. Viswanath, Fundamentals of Wireless Communication, Cambridge University Press, 2005.
  • References
    • A. Goldsmith, Wireless Communications, Cambridge Press, 2005.
    • Theodore S. Rappaport, Wireless Communications: Principles and Practice, 2nd Edition, Prentice Hall PTR, 2002. ISBN-13: 978-0130422323. Call No. TK5103.2 R37 2002
      • There are quite a number of typos in this book. Please go to the update page to download the pdf file of the pages that have been fixed.
    • M. R. Karim and Mohsen Sarraf, W-CDMA and cdma2000 for 3G Mobile Networks, McGraw-Hill Professional, 2002.
    • J. S. Lee and L. E. Miller, CDMA Systems Engineering Handbook, Boston, MA: Artech House, Oct. 1998.
    • R.E. Ziemer, Fundamentals of Spread Spectrum Modulation, Colorado Springs: Morgan & Claypool Publishers, 2007
    • A. Bahai, B. R. Saltzberg, and M. Ergen, Multi-Carrier Digital Communications: Theory and Applications of OFDM, 2nd ed., New York: Springer Verlag, 2004.
    • H.G. Myung and D.J. Goodman, Single Carrier FDMA: A New Air Interface for Long Term Evolution, Wiley, 2008.

Handouts and Course Material


Ch Handouts & Slides
  • Remark: You may take a look at the slides from previous year for a sneak preview of the up-coming class meterial

Problem Set


  Due Date Remarks/Solutions
HW1 Nov 26 (10:30AM) Solution
HW2 Dec 12 (10:30AM) Solution
Self-Evaluation Jan 9  
HW3 Jan 14 Solution
HW4 Feb 4 (8:50AM)

We haven't discussed Q6 yet. Therefore, Q6 is now moved to the next HW.


HW5 Free


MATLAB codes: Q3, Q5, Q6-7

Self-Evaluation Mar 4 (5 PM) Extension: Submit this before the exam.
Formula Sheet for Final Exam Mar 4 (5 PM)  



Reading Assignment

Course Outline

  1. Review: Fourier transform and basic communication systems
  2. Cellular communications, Principles of cellular radio
    • Wireless Channel (Part 1)
    • Spectrum Allocation
    • Frequency Reuse and Sectoring
    • Trunking Theory and Erlang B formula
    • Poisson Process with review of basic probability theory
    • Markov Chain
      • The "best" introductory textbook on Markov chain is probably the one written by Norris. The whole textbook is an overkill for this class but it serves as a good reference if you want to dig into this topic further. There are some sample chapters available on the web as well.
      • Whitt wrote an article that provide several remarks on Erlang B formula via a number of HW exercises. Those who want to read more about Erlang B study may find it interesting.
  3. Duplexing: TDD vs FDD
  4. Multiple access schemes
  5. Spread Spectrum Communications
  6. Multi-carrier and OFDM systems
    • Wireless Channel (Part 2), multipath propagation and Equalization
    • Multi-carrier transmission and frequency division multiplexing
    • Orthogonality (revisited)
    • DFT and FFT
    • Oversampling
    • Cyclic Prefix and circular convolution
    • For deeper understanding of OFDM, please read
    • OFDMA
  7. GSM, GPRS, EDGE, UMTS (W-CDMA) and OVSF code
  8. WiMAX and OFDMA
  9. LTE and SC-FDMA

Misc. Links