Title :
Analysis of two digital adaptive pre-correctors for nonlinearity in OFDM systems
Author :
Redaelli, G. ; Corvino, M. ; Paderni, V. ; Spalvieri, A. ; Leva, A. ; Solonna, D.
Author_Institution :
CEFRIEL, Milan, Italy
Abstract :
This paper deals with two innovative schemes of digital adaptive pre-correction for the high power amplifier (HPA) nonlinearity in OFDM transmission systems. In order to evaluate pre-correction performance in terms of BER, total degradation, and normalized power spectral density, a simulator has been implemented including actual solid state power amplifier (SSPA) and travelling wave tube amplifier (TWTA) characteristics. The results thus obtained are compared with limit performance achievable with the clipper (perfectly linear amplifier with saturation). Finally, based on the pre-correction gain parameter, the considerable performance improvement for the pre-corrected system comparing with the non-pre-corrected transmitter is pointed out
Keywords :
OFDM modulation; adaptive systems; digital video broadcasting; error statistics; power amplifiers; radiofrequency amplifiers; spectral analysis; travelling wave amplifiers; BER; DVB-T; HPA nonlinearity; OFDM systems; TWTA characteristics; digital adaptive pre-correctors; high power amplifier; nonlinearity; nonpre-corrected transmitter; normalized power spectral density; perfectly linear amplifier; pre-correction gain parameter; pre-correction performance; saturation; simulator; solid state power amplifier; terrestrial digital video broadcasting; total degradation; travelling wave tube amplifier; Bit error rate; DSL; Digital audio broadcasting; Digital video broadcasting; Interference; Nonlinear distortion; OFDM; Power amplifiers; Telecommunications; Transmitters;
Conference_Titel :
Communications, 1999. ICC '99. 1999 IEEE International Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-5284-X
DOI :
10.1109/ICC.1999.767917
