| 基于Optisystem的OFDM-ROF系统的数字预失真设计与实现 |
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| 引用本文： | 李星沛,何方白.基于Optisystem的OFDM-ROF系统的数字预失真设计与实现[J].现代电子技术,2014(16):34-36. |
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| 作者姓名： | 李星沛 何方白 |
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| 作者单位： | [1]重庆邮电大学,重庆400065; [2]内江职业技术学院,四川内江641000 |
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| 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。
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| 关 键 词： | OFDM-ROF Optisystem 二分法 割线法 预失真算法 |
Design and implementation of digital pre-distortion in OFDM-ROF system based on Optisystem |
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| Institution: | LI Xingpei, HE Fangbai (1. Chongqing University of Posts and Telecommunications, Chongqing 400065, China; 2. Neijiang Vocational ＆ Technical College, Neijiang 641000, China) |
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| Abstract: | 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. |
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| Keywords: | OFDM-ROF Optisystem dichotomy secant method pre-distortion algorithm |
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