Digital Predistortion for Active Hybrid Antenna Arrays

• Main Authors: Hsu, Haur-Yi, 徐豪邑
• Other Authors: Wu, Wen-Rong
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/v7r82c

碩士 === 國立交通大學 === 電信工程研究所 === 107 === Digital predistortion (DPD) technique is one of the most widely used methods for compensating the nonlinear distortion of power amplifiers (PA) in wireless communication systems. On the other hand, antenna array has been considered as an enabling technology for 5G. This thesis considers the application of DPD in active hybrid antenna array systems. Most of the existing DPD systems for antenna array use feedback paths to obtain training data. However, the number of feedback paths will be increased as the number of antennas increases, significantly affecting the cost and complexity of the system. We first propose a new structure which uses a single receiving antenna instead of multiple feedback paths to obtain training data. Then, we further discuss the problems encountered in this architecture and propose feasible solutions. Simulation results show that the proposed DPD architecture performs effectively for high PAPR modulation schemes such as OFDM.