Performance comparison of adaptive digital predistortion algorithms using adaptation time for mobile WiMAX power amplifier applications

Authors : Ji-yeon KIM, Jong-heon KIM

Pages : 4098-4104

View : 10 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In this paper, we propose that adaptation time be considered a parameter for evaluating the performance of digital filter algorithms in adaptive digital predistorted high-power amplifiers. An adaptive predistorted high-power amplifier with an average power of 37.5 dBm was designed and fabricated for mobile worldwide interoperability for microwave access insert ignore into journalissuearticles values(WiMAX); test signals. For performance comparisons using adaptation time, several effective algorithms insert ignore into journalissuearticles values(such as the least-mean-squares insert ignore into journalissuearticles values(LMS);, recursive-least-squares insert ignore into journalissuearticles values(RLS);, and affine projection insert ignore into journalissuearticles values(AP); algorithms); were implemented. According to the experimental results, the RLS and AP algorithms achieved a similar linearity improvement of 11 dBr. However, the AP algorithm had the advantage of a faster adaptation time than the other algorithms.
Keywords : High power amplifier, linearization, digital predistortion, adaptive filter algorithm, mobile worldwide interoperability for microwave access