频域选择性压缩采样的数字预失真计算优化  

Optimized calculation for digital pre-distortion based on frequency selective compressive sampling

作　　者：张烈[1] 冯燕[1] 李琳[2] 

机构地区：[1]西北工业大学电子信息学院,西安710129 [2]西安邮电大学电子工程学院,西安710021

出　　处：《计算机工程与应用》2015年第20期102-106,共5页Computer Engineering and Applications

摘　　要：为了节省数字预失真的计算量提高迭代速度,提出一种基于频域选择性压缩采样的数字预失真计算量优化方法,降低数字预失真的矩阵计算部分计算量,使数字预失真单次迭代速度显著提升。仿真中使用10 MHz正交频分复用(OFDM)信号通过快速傅里叶变换FFT进行数据可用带宽的稀疏压缩采样,然后再进行参数提取,矩阵计算部分的计算量可优化到60%,而且数字预失真迭代效果与压缩采样前保持一致。In order to reduce the calculation complexity of digital pre-distortion of radio frequency power amplifier, an optimized approach of the calculation complexity for digital pre-distortion based on frequency selective compressive sampling is proposed, which can reduce calculation complexity of matrix part and make iterative rate fast. The 10 MHz OFDM signal is employed to do simulations. Fast Fourier Transform（FFT）is used to the sparse compress sampling of the available bandwidth. The simulation results show that the proposed approach can effectively reduce calculation complexity of Digital Pre-Distortion（DPD）whose matrix part is optimized to 60% and performance is same with the conventional method.

关 键 词：功率放大器 数字预失真 压缩采样 快速傅里叶变换 计算量优化 Digital Pre-Distortion(DPD) Fast FOURIER Transform(FFT) 

分 类 号：TN919[电子电信—通信与信息系统]