Title :
Research and implementation of adaptive digital pre-distortion in high-speed 32-APSK satellite communication system
Author :
Celun Liu ; Wei Du ; Ping Tang ; Xinmeng Li ; Zhulin Xiong
Author_Institution :
Sch. of Inf. & Electron., Beijing Inst. of Technol., Beijing, China
Abstract :
Adaptive Digital Pre-distortion (DPD) is applied to the typical traveling wave tube amplifier for high-speed 32-APSK satellite communication system. The paper presents research and implementation of adaptive digital pre-distortion. We show first the transmission system model and the adaptive algorithm based on QR decomposition RLS algorithm to achieve adaptive digital pre-distortion. We also present the hardware architecture of the pre-distorter. Finally, we apply the pre-distorter to an actual satellite communication system whose the modulation is 32-APSK with symbol rate of 162.5MHz. The experimental results show that the linear effect and the performance of the system are greatly improved by the application of adaptive digital pre-distortion.
Keywords :
adaptive modulation; least squares approximations; matrix decomposition; phase shift keying; satellite communication; travelling wave amplifiers; DPD; QR decomposition RLS algorithm; adaptive digital pre-distortion; frequency 162.5 MHz; hardware architecture; high-speed 32-APSK satellite communication system; linear effect; transmission system model; traveling wave tube amplifier; Arrays; Hardware; Modulation; Nonlinear distortion; Power amplifiers; Satellite communication; Vectors; 32-APSK; QRD-RLS; adaptive digital pre-distortion; satellite communication;
Conference_Titel :
Communications and Networking in China (CHINACOM), 2014 9th International Conference on
DOI :
10.1109/CHINACOM.2014.7054310
