Title :
A tunable pre-distorter for linearization of solid state power amplifier in mobile wireless OFDM
Author :
Lee, Byung Moo ; de Figueiredo, Rui J.P.
Author_Institution :
Lab. for Intelligent Signal Process. & Commun., California Univ., Irvine, CA, USA
Abstract :
One of the major problems posed by orthogonal frequency division multiplexing (OFDM) is its high peak-to-average-power ratio (PAPR), which seriously limits the power efficiency of the solid state power amplifier (SSPA) because of the nonlinear distortion caused by high PAPR. In the present paper, we describe an analytical design approach that uses a sparse and yet accurate model for the pre-distorter (PD) based on the SSPA characteristics. Furthermore, the PD configuration is self-tuning, i.e., it can automatically re-adjust itself by tracking changes in the SSPA characteristics with very few (typically two) training symbols.
Keywords :
OFDM modulation; linearisation techniques; mobile radio; power amplifiers; radiofrequency amplifiers; mobile wireless OFDM; orthogonal frequency division multiplexing; peak-to-average-power ratio; solid state power amplifier; solid state power amplifier linearization; tunable predistorter; Closed-form solution; High power amplifiers; Least squares approximation; Nonlinear distortion; OFDM; Peak to average power ratio; Power amplifiers; Solid state circuits; Table lookup; Wireless LAN;
Conference_Titel :
Emerging Technologies: Circuits and Systems for 4G Mobile Wireless Communications, 2005. ETW '05. 2005 IEEE 7th CAS Symposium on
Print_ISBN :
5-7422-0895-2
DOI :
10.1109/EMRTW.2005.195686
