King Fahd University of Petroleum and Minerals
Electrical Engineering Department
Seminar Series
You are cordially invited to attend a seminar 

Speaker	:	Dr. Ali Al-Shaikhi
Asst. Professor EE Department, KFUPM.
Date		:	Tuesday October 21, 2008
Time		:	1:00 p.m. – 2:00 p.m.
Venue	:	Building 59 Room 2002 
(Refreshment will be served)

Title:
Design of Expanded Constellations for PAPR Reduction in OFDM Systems

Abstract
The demand for wireless channel and high data rate is increasing. However, such channel under such requirement is very harsh and causes multipath fading resulting in inter-symbol-interference (ISI). One of the best solution employed in such environment is orthogonal frequency division multiplexing (OFDM) system. However, OFDM systems suffer from the high peak to average power ratio (PAPR) causing inefficient usage of the high power amplifier (HPA). There are many techniques used to reduce the high PAPR. These techniques trade off complexity, data rate, signal power, and bit error rate (BER) to reduce the high PAPR of the transmitted OFDM signal.
In this seminar we introduce OFDM systems. Its advantages, applications, and problems are highlighted. Then, we propose a new method for PAPR reduction in OFDM systems. The method benefits from a novel constellation design and an innovative utilization of erasure codes. The complementary cumulative distribution function (CCDF) of the modified OFDM signals shows PAPR reduction in the range of 5 dB at a clipping probability of 10-4 over the original OFDM signals.

NOTE: For more details about EE Seminars, please visit our seminar home page, http://www.kfupm.edu.sa/ee/seminar.htm
http://faculty.kfupm.edu.sa/ee/muqaibel/seminars.htm