电子设计工程
電子設計工程
전자설계공정
ELECTRONIC DESIGN ENGINEERING
2012年
19期
103-105
,共3页
史聃%吕星哉%陈明%徐洋
史聃%呂星哉%陳明%徐洋
사담%려성재%진명%서양
数字预失真%增益平坦度%最小二乘法%Matlab工具箱
數字預失真%增益平坦度%最小二乘法%Matlab工具箱
수자예실진%증익평탄도%최소이승법%Matlab공구상
Digital Pre-Distortion (DPD)%gain flatness%least squares%Matlab tool box
针对数字预失真系统对反馈链路平坦度的要求,提出一种在不断开模拟链路的前提下,采用单音测量WCD.MA&LTE混模基站射频拉远单元反馈链路的增益平坦度,并采用最小二乘法,分别拟合射频、本振和中频的增益的方法。采用MATLAB工具产生滤波器系数,在基本不增加复杂度的基础上,通过DPD软件离线补偿中频的增益不平坦度。实际应用取得良好的补偿效果。
針對數字預失真繫統對反饋鏈路平坦度的要求,提齣一種在不斷開模擬鏈路的前提下,採用單音測量WCD.MA&LTE混模基站射頻拉遠單元反饋鏈路的增益平坦度,併採用最小二乘法,分彆擬閤射頻、本振和中頻的增益的方法。採用MATLAB工具產生濾波器繫數,在基本不增加複雜度的基礎上,通過DPD軟件離線補償中頻的增益不平坦度。實際應用取得良好的補償效果。
침대수자예실진계통대반궤련로평탄도적요구,제출일충재불단개모의련로적전제하,채용단음측량WCD.MA&LTE혼모기참사빈랍원단원반궤련로적증익평탄도,병채용최소이승법,분별의합사빈、본진화중빈적증익적방법。채용MATLAB공구산생려파기계수,재기본불증가복잡도적기출상,통과DPD연건리선보상중빈적증익불평탄도。실제응용취득량호적보상효과。
The gain flatness of feedback chain is a key feature in a WCDMA<E mixed mode base-station Radio Remote Head (RRH). The flatness is measured using CW without destroying the integrality of the analog chains. The gains of RF, LO and IF are calculated separately with least squares curve fitting algorithm. The coefficients of compensation filter are generated using MATLAB tools. The flatness of IF is compensated offline in DPD software with little additional complexity. The method works well in practical system.