Title :
Implementation of a linearized power amplifier using the predistorter and direct conversion technique
Author :
Jung, Chang Kyoo ; Ryu, Byeow Yeol ; Park, Han Kyu
Author_Institution :
Dept. of Electron. Eng., Yonsei Univ., Seoul, South Korea
Abstract :
A linearization system with a digital adaptive predistorter is implemented in order to restrict the spectral spreading and adjacent channel interference in mobile radio systems. Using the output of amplifiers which is directly down-converted to a baseband predistorter and the quantized power of transmitted baseband signal, the look-up table is completed by an adaptive algorithm. An experiment shows that the peak to sidelobe ratio is 15 dB higher than that of a nonlinear amplifier
Keywords :
adaptive signal processing; adjacent channel interference; land mobile radio; power amplifiers; radiofrequency amplifiers; adaptive algorithm; adjacent channel interference; baseband predistorter; digital adaptive predistorter; direct conversion technique; experiment; linearization system; linearized power amplifier; look-up table; peak to side lobe ratio; predistorter; quantized power; spectral spreading; transmitted baseband signal; Baseband; Nonlinear distortion; Phase distortion; Phase modulation; Power amplifiers; Power generation; Quadrature phase shift keying; Radio frequency; Radiofrequency amplifiers; Table lookup;
Conference_Titel :
Singapore ICCS '94. Conference Proceedings.
Print_ISBN :
0-7803-2046-8
DOI :
10.1109/ICCS.1994.474064
