摘要
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。
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.
出处
《现代电子技术》
2014年第16期34-36,共3页
Modern Electronics Technique
