Title :
A robust and low sampling rate digital predistortion algorithm for broadband PA modeling and predistortion
Author :
Gongzhe Su ; Wenhua Chen ; Silong Zhang ; Ghannouchi, Fadhel M.
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A robust and low sampling rate digital predistortion (DPD) algorithm for broadband power amplifiers (PAs) is proposed in this paper. To alleviate the burden on the sampling rate, an approximated model extracted by bandlimited signals is employed to approach the broadband behavior. Due to the assistance of the low pass filter (LPF) in the feedback loop and the adaptive basis function scheme, the sampling rate can be reduced drastically and the algorithm is more robust. Experimental results show that more than 21 dB adjacent channel power ratio (ACPR) improvement is achieved for 60MHz 3-carrier LTE signal application only with 92.16Msps sampling rate, and the cavity RF filter in the feedback loop is not necessary any more.
Keywords :
low-pass filters; power amplifiers; ACPR improvement; DPD algorithm; LPF; LTE signal application; adaptive basis function scheme; adjacent channel power ratio; approximated model; bandlimited signals; broadband PA modeling; broadband PA predistortion; broadband behavior; broadband power amplifiers; low pass filter; low sampling rate digital predistortion algorithm; robust sampling rate digital predistortion algorithm; Adaptation models; Broadband communication; Cavity resonators; Filtering algorithms; Microwave filters; Predistortion; Robustness; Broadband Modeling; Digital Predistortion; Memory Polynomial; Power Amplifiers;
Conference_Titel :
Wireless and Microwave Technology Conference (WAMICON), 2014 IEEE 15th Annual
Conference_Location :
Tampa, FL
DOI :
10.1109/WAMICON.2014.6857759
