Title :
Tunable pre-distorter for PAPR mitigation in MB-OFDM UWB signals
Author :
Murthy, T.S.N. ; Deergha Rao, K.
Author_Institution :
Dept. of ECE, Chaitanya Bharathi Inst. of Technol., Hyderabad
Abstract :
Multi-band Orthogonal Frequency Division Multiplexing (MB-OFDM) is an efficient approach for Ultra Wideband (UWB) wireless communication applications. However, the high Peak to Average Power Ratio (PAPR) of MB-OFDM UWB signals, limits the power efficiency of the Solid State Power Amplifier (SSPA) due to nonlinear distortion caused by high PAPR. Hence, it is necessary to reduce the PAPR of MB-OFDM UWB signals. In this paper, we used a tunable Pre-Distorter (PD) based on the High Power Amplifier (HPA) characteristics for PAPR reduction of MB-OFDM UWB signals. The PD configuration is self-tuning, i.e., it can automatically readjust itself by tracking changes in the HPA characteristics with very few (typically two) training symbols. Through Computer simulations, the performance of the predistorter is evaluated in comparison with filtering after clipping, and clipping with turbo coding for PAPR reduction. The Bit-Error Rate (BER) is used as performance measure in this evaluation.
Keywords :
OFDM modulation; error statistics; power amplifiers; ultra wideband communication; BER; MB-OFDM UWB signals; PAPR mitigation; bit error rate; high power amplifier; multiband orthogonal frequency division multiplexing; peak to average power ratio; solid state power amplifier; tunable predistorter; ultra wideband wireless communication applications; Bit error rate; Broadband amplifiers; Computer simulation; High power amplifiers; Nonlinear distortion; OFDM; Peak to average power ratio; Solid state circuits; Ultra wideband technology; Wireless communication; MB-OFDM UWB; Pre-Distorter; SSPA; clipping; peak-to- average power ratio (PAPR);
Conference_Titel :
Ultra-Wideband, 2008. ICUWB 2008. IEEE International Conference on
Conference_Location :
Hannover
Print_ISBN :
978-1-4244-2216-6
Electronic_ISBN :
978-1-4244-1827-5
DOI :
10.1109/ICUWB.2008.4653412