摘要
本文基于R&S公司SMW200A信号源和FSW43频谱仪验证了提出的宽带数字预失真算法。采用一个64QAM调制、600MHz带宽、峰均比7.0 d B、采样率为1.92GHz的宽带信号去激励一个工作在1.8GHz的AB类功率放大器,在功放接近饱和条件下,利用提出的简化GMP模型进行数字预失真校正,输出信号的EVM指标从8.4%改善到1.4%,满足了线性化要求,同时实验证明了简化的GMP模型有与GMP模型接近的性能,模型系数个数约GMP模型的三分之一。
Thispaperpresents a wideband digital predistortion algorithm and achieves the validation based on R&S SMW200A and FSW43.Using a 64-QAM 600MHz bandwidth signal with 7.0dB PAPR and 1.92GHz sampling rate,the Class AB power amplifier that operated at 1.8GHz was linearized with a novel digital predistortion(DPD)technique based on reduced GMP model.When the operation points were approximately the saturation region,the measured EVM was reduced from 8.4%to 1.4%,meeting the linearity specifications.The experiments also showed that the Reduced GMP model’s performance was closeto GMP model’s and its number ofcoefficientswas nearly onethird of GMP model’s.
作者
陈龙
陈文华
CHEN Long;CHEN Wen-hua
出处
《中国集成电路》
2018年第11期26-29,共4页
China lntegrated Circuit