UP Paper 394 US-M-BDOWN
Performance of OFDM-CDMA System with PAPR Reduction in Nonlinear Rayleigh Fading Channel
de Figueiredo,Rui J. P.Life Fellow, IEEE
FANG,LINMember, IEEE
This paper studies an orthogonal frequency division multiplexing (OFDM) - code division multiple access (CDMA) system in the frequency-selective Rayleigh fading channel with the nonlinear distortion caused by high power amplifier (HPA). The bit error rate (BER) has been derived which agrees well with the simulation results. Next, we present a new technique to reduce the large instantaneous envelope variations of the OFDM-CDMA signals. This approach is a simple input-power management processing with just minimal extra bandwidth for side information. It is based on the recursive-least-squares (RLS) algorithm to minimize the mean squared error of input instantaneous power and the average input power to HPA, which is shown to suppress the peak-to-average power ratio (PAPR) significantly and improve the system performance as a result. Finally, from the spectral behavior investigation, the present power management is shown to yield a significant adjacent channel power ratio (ACPR) reduction.

Lin Fang received the B.S. degree in electrical engineering from Tianjin University, Tianjin, China in 1993, the M.S. degree in electrical engineering from Tsinghua University, Beijing, China, in 1996, and the Ph.D. degree in electrical engineering from University of California, San Diego, in 2000. From 2000 to 2004, Lin Fang worked at Philips Semiconductors and Valence Semiconductors as an ASIC System Engineer. Since 2004, she has been a Postdoc to work in the Department of Electrical Engineering and Computer Science, University of California, Irvine. Her current research interests include wireless communication technology for future generation, energy efficient wireless network, and general communication theory. Rui J. P. de Figueiredo (LF’94) received the B.S. and M.S. degrees in electrical engineering from the Massachusetts Institute of Technology, Cambridge, and the Ph.D. degree in applied mathematics from Harvard University, Cambridge. After several years on the faculty of Rice University, Houston, TX, he joined the University of California, Irvine, in 1990, where he holds the position of Professor of electrical engineering and computer science, bio-medical engineering, and mathematics. He has published more than 370 papers and chaired or co-chaired 12 national or international conferences. Dr. de Figueiredo was the President of the IEEE Circuits and Systems Society in 1998 and served on several national and international committees and panels. For all of these contributions, he received a number of awards, including the IEEE Fellow award; the 1994 IEEE Circuits and Systems Society Technical Achievement Award; this society’s 2002 M. E. Van Valkenburg Society Award and its 1999 Golden Jubilee Medal; the IEEE Third Millennium Medal; the Gh. Asachi Medal from the Technical University of Iasi, Romania; the 2000 IEEE Neural Networks Transactions Outstanding Paper Award; and the 2003 IEEE Circuits and Systems Transactions Guillemin–Cauer Best Paper Award.