Effect of PAPR Reduction Techniques on the Performance of MB-OFDM UWB in Wireless Communications

Abstract

Multiband orthogonal frequency division multiplexing (MB-OFDM) is an efficient approach for ultra-wideband (UWB) wireless communication applications. One major difficulty of MB-OFDM UWB signal is its large peak-to-average power Ratio (PAPR). The high PAPR limits its capacity due to the distortion caused by the nonlinear characteristics of both the analog-to-digital converter (ADC) and high-power amplifier (HPA). Hence, it is necessary to reduce the PAPR of MB-OFDM UWB signals. Several techniques have been reported in the literature for PAPR reduction in OFDM. These techniques can also be extended for PAPR reduction in MB-OFDM UWB signals. However, comparative performance evaluation of these techniques for PAPR reduction in MB-OFDM UWB signals is lacking in the literature. Hence, in this paper, four techniques, namely, filtering after clipping, turbo coding of clipped signals, tunable predistorter, and active constellation extension are extended for PAPR reduction of MB-OFDM UWB signals and their performance is evaluated and compared through computer simulations. In this evaluation, the bit-error rate (BER) is used as the performance measure.

Keywords:

• Active constellation extension
• MB-OFDM UWB
• Peak-to-average power ratio
• Predistorter
• Turbo coding

Additional information

Notes on contributors

T. S. N. Murthy

T. S. N. Murthy received the B.Tech. degree in electronics and communications engineering and M.Tech degree in Microwave Engineering from Nagarjuna University, Guntur, India, in 2002, and 2005 respectively. He is working towards his PhD in the area of MB-OFDM UWB as a part-time candidate in the Research and training Unit, for Navigational Electronics, Osmania University, Hyderabad. He is presently working as an Asst. Professor in the department of ECE, CBIT engineering college, Hyderabad. He has presented papers in IEEE International Conferences at U.K., Singapore and Germany. He is a member of IEEE. E-mail: [email protected]

K. Deergha Rao

K. Deergha Rao received his B.E (Elect. Engg.) and M.E (Control Systems) degrees from Andhra University, Visakhapatnam, India, in 1977 and 1980 respectively, and Ph.D. degree in electronics and communication engineering from Osmania University, Hyderabad, India, in 1993.He is a senior member of IEEE. He is presently a professor in the Research and Training Unit for Navigational Electronics, Osmania University. He served as a postdoctoral fellow and part-time professor from March 1999 to March 2003 in the Dept. of ECE, Concordia University, Montreal, Canada. As part-time professor, he has taught the courses Digital Signal Processing and Channel coding to the Master and Ph.D students at Concordia University.

He has presented papers at IEEE International conferences several times in USA, Switzerland, and Russia. His research interests include GPS signal processing, Wireless channel coding, Blind Equalization, Robust Multiuser detection, OFDM UWB signal processing, Image processing, Cryptosystems, VLSI signal processing. So far one Ph.D was awarded under his guidance and presently six students are working towards Ph.D under his guidance. He has more than 100 publications to his credit including 46 publications in IEEE journals and conference proceedings E-mail: [email protected]