Experimental investigation on multi-dimensional digital predistortion for multi-band radio-over-fiber systems.
Experimental investigation on multi-dimensional digital predistortion for multi-band radio-over-fiber systems.
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DOI：
10.1364/oe.22.004649
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发表时间：
2014-02
期刊：
影响因子：
3.8
通讯作者：
Hao Chen;Jianqiang Li;Kun Xu;Yinqing Pei;Yitang Dai;Feifei Yin;Jintong Lin
中科院分区：
文献类型：
--
作者：
Hao Chen;Jianqiang Li;Kun Xu;Yinqing Pei;Yitang Dai;Feifei Yin;Jintong Lin
针对直接调制和外调制两种多波段光载无线电（RoF）系统，从非线性阶数、存储长度、过采样率、数模转换分辨率、载波频率依赖性和射频输入功率容限等方面对近年来提出的多维数字预失真（DPD）技术进行了实验研究。在直接调制和外部调制RoF系统中识别多维数字预失真器的类似特性。实验结果表明，在2倍过采样率下，可实现非线性阶数高达5的无记忆多维数字预失真器，适用于实际的多频带RoF系统。使用所建议的参数，多维DPD能够在两个频带RoF系统中对于每个频带提高RF输入功率容限大于3dB，表明RF功率发射效率的增强。
The recently-proposed multi-dimensional digital predistortion (DPD) technique is experimentally investigated in terms of nonlinearity order, memory length, oversampling rate, digital-to-analog conversion resolution, carrier frequency dependence and RF input power tolerance, in both directly-modulated and externally-modulated multi-band radio-over-fiber (RoF) systems. Similar characteristics of the multi-dimensional digital predistorter are identified in directly-modulated and externally-modulated RoF systems. The experimental results suggest implementing a memory-free multi-dimensional digital predistorter involving nonlinearity orders up to 5 at 2 × oversampling rate for practical multi-band RoF systems. Using the suggested parameters, the multi-dimensional DPD is able to improve the RF input power tolerance by greater than 3dB for each band in a two-band RoF system, indicating an enhancement of RF power transmitting efficiency.