现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2014年
16期
34-36
,共3页
OFDM-ROF%Optisystem%二分法%割线法%预失真算法
OFDM-ROF%Optisystem%二分法%割線法%預失真算法
OFDM-ROF%Optisystem%이분법%할선법%예실진산법
OFDM-ROF%Optisystem%dichotomy%secant method%pre-distortion algorithm
针对OFDM-ROF系统中传输链路中各器件的非线性等问题，提出基于查找表的二分法和与割线法结合的数字预失真算法，并利用Matlab实现OFDM的发射、接收和数字预失真处理模块，再运用Optisystem 7.0搭建了OFDM-ROF仿真实验平台。通过16QAM星座图预失真前后仿真结果对比、以及AM/AM和AM/PM特性结果显示，采用二分法和与割线法相结合的自适应算法能改善OFDM-ROF系统的非线性问题，为OFDM-ROF系统的数字预失真硬件电路实现提供了依据和参考。
針對OFDM-ROF繫統中傳輸鏈路中各器件的非線性等問題，提齣基于查找錶的二分法和與割線法結閤的數字預失真算法，併利用Matlab實現OFDM的髮射、接收和數字預失真處理模塊，再運用Optisystem 7.0搭建瞭OFDM-ROF倣真實驗平檯。通過16QAM星座圖預失真前後倣真結果對比、以及AM/AM和AM/PM特性結果顯示，採用二分法和與割線法相結閤的自適應算法能改善OFDM-ROF繫統的非線性問題，為OFDM-ROF繫統的數字預失真硬件電路實現提供瞭依據和參攷。
침대OFDM-ROF계통중전수련로중각기건적비선성등문제，제출기우사조표적이분법화여할선법결합적수자예실진산법，병이용Matlab실현OFDM적발사、접수화수자예실진처리모괴，재운용Optisystem 7.0탑건료OFDM-ROF방진실험평태。통과16QAM성좌도예실진전후방진결과대비、이급AM/AM화AM/PM특성결과현시，채용이분법화여할선법상결합적자괄응산법능개선OFDM-ROF계통적비선성문제，위OFDM-ROF계통적수자예실진경건전로실현제공료의거화삼고。
For nonlinear characteristics of each device in transmission link in OFDM-RoF system,the digital pre-distortion algorithm of dichotomy combining secant method based on LUT are proposed,Matlab is used to realize the OFDM’s receiving, transmitting and digital pre-distortion processing module,and Optisystem7.0 are used to establish a OFDM-ROF simulation plat-form. Contrast results of the simulation before and after pre-distortion in 16QAM constellation charts,AM/AM and AM/PM charac-teristics show that the self-adaptive algorithm combining the dichotomy with the secant method can improve the nonlinear of OFDM-ROF system. It provided a basis and reference for implementation of the digital pre-distortion hardware circuit in OFDM-ROF system.
