Title :
Mobile phone power amplifier linearity and efficiency enhancement using digital predistortion
Author :
Ceylan, N. ; Mueller, J.E. ; Pittorino, T. ; Weigel, R.
Author_Institution :
Secure Mobile Solutions, Infineon Technol., Munich, Germany
Abstract :
The new generation mobile communication systems using spectrum efficient linear modulation schemes (QPSK, 8PSK, QAM) need linear power amplifiers in the transmission path to have good ACPR and EVM values. Linearization methods can be used to increase the linearity of the power amplifiers (PA). However, it is not reasonable to use complicated, power consuming and high cost systems. This paper presents a digital predistortion implementation for WCDMA signals using an FPGA (field programmable gate array) as DSP and investigates the application of this system in handsets. The method applied requires minimum change in the conventional transmitter path configuration but considerable PAE improvement can be achieved.
Keywords :
MMIC power amplifiers; code division multiple access; digital signal processing chips; distortion; field programmable gate arrays; linearisation techniques; mobile handsets; phase shift keying; quadrature amplitude modulation; quadrature phase shift keying; 8PSK; ACPR; EVM; FPGA DSP; PAE improvement; QAM; QPSK; WCDMA signals; digital predistortion; efficiency enhancement; field programmable gate array; linear power amplifiers; linearity; linearization methods; mobile communication systems; mobile handsets; mobile phone power amplifier linearity; spectrum efficient linear modulation schemes; transmitter path configuration; Costs; Field programmable gate arrays; Linearity; Mobile communication; Mobile handsets; Power amplifiers; Power generation; Predistortion; Quadrature amplitude modulation; Quadrature phase shift keying;
Conference_Titel :
Microwave Conference, 2003. 33rd European
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMC.2003.1262271
