Title :
Digital predistortion linearizer for multicarrier spread spectrum
Author :
Li, Junsong ; Muhonen, Kathleen J. ; Kavehrad, M.
Author_Institution :
Pennsylvania State Univ., University Park, PA, USA
Abstract :
This paper analyzes an OFDM-CDMA system with a digital predistortion linearizer. Digital predistortion was the linearizer of choice since it has no stability problems with wideband signals and can be implemented as a fully adaptive digital solution which lends itself to operation not only in the base station but in a mobile unit as well. Results show that for this particular amplifier, a 3 to 4 dB improvement in output back off is achieved with a corresponding increase in amplifier efficiency of about 25 to 30%. This was achieved with equal or improved bit error rate performance with respect to the nonlinear case
Keywords :
OFDM modulation; adaptive signal processing; code division multiple access; error statistics; land mobile radio; linearisation techniques; power amplifiers; radiofrequency amplifiers; spread spectrum communication; BER performance; OFDM-CDMA system; adaptive digital solution; amplifier efficiency; base station; bit error rate performance; digital predistortion linearizer; mobile unit; multicarrier spread spectrum; nonlinear power amplifier; output back off; wideband signals; Base stations; Bit error rate; Multiaccess communication; Multicarrier code division multiple access; Nonlinear distortion; OFDM; Power amplifiers; Power generation; Predistortion; Spread spectrum communication;
Conference_Titel :
Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-5454-0
DOI :
10.1109/RAWCON.1999.810971
