ELE 731 DIGITAL COMMUNICATIONS II

2010-2011 Spring Semester

INSTRUCTOR: Prof. Dr. Mehmet Şafak

TEXTBOOK:

Lecture notes

A. Goldsmith, Wireless Communications, Cambridge Un. Press: 2005

J. Proakis, Digital Communications (4^th edition), McGraw Hill:2002.

B. Sklar, Digital Communications(2^nd edition), Prentice Hall:2002

LECTURE: Monday 9:00-11:45 in Seminar Hall

EXAMS: Midterm 1 28 March 2011 20%

Midterm 2 02 May 2011 20%

Homework/Term Project 20%

Final Exam TBD 40%

CONTENTS:

1. FADING MULTIPATH CHANNELS

Time-variant multipath channels, statistical characterisation of multipath channels, multipath intensity profile, frequency and time selectivity, coherence time, coherence bandwidth, channel impulse response, channel model, slow fading, fast fading, mobile radio channel, digital signaling over a frequency selective slowly fading channel, Rake demodulator.

2. DIVERSITY AND COMBINING TECHNIQUES

Macroscopic and microscopic diversity. Time, frequency, space, angle and polarisation diversity. Combining techniques; selective combining, switched combining, equal-gain combining, and maximal ratio combining. Pre-detection and post-detection combining. Transmit diversity. Beamforming. The performance of diversity systems in fading. MIMO systems. Introduction to cooperative communications.

3. MULTIPLE ACCESS

Frequency division multiple access, time division multiple access and code division multiple access. Capacity of FDMA, TDMA and CDMA. Random access methods; ALOHA, slotted ALOHA, reservation ALOHA, carrier sense multiple access, token-ring. Polling techniques. Queueing theory; Erlang-B and C formulas.