Linearization of a Radio-over-Fiber mobile fronthaul with feedback loop

2017 26th Wireless and Optical Communication Conference (WOCC) Pub Date : 2017-04-07 DOI:10.1109/WOCC.2017.7928986

Carlos Mateo, Jesús Clemente, P. G. Ducar, P. L. Carro, J. D. Mingo, Iñigo Salinas

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引用次数: 1

Abstract

The main disadvantage of Radio over Fiber (RoF) links digital predistortion (DPD) is that it is necessary to feedback the output signals at the Remote Radio Head (RRH) in a real scenario. Along the literature digital predistortion on RoF mobile fronthaul architectures considers an ideal feedback system, so it cannot be deployed in real systems. We propose the use of a RoF link to feedback these signals. This RoF link can be accomplished by an independent RoF link, in which the feedback signals are sent from the RRH to the Baseband Unit (BBU). Experiments are carried out with a 20MHz-LTE downlink signal (16QAM) at 2.65 GHz within the Band 7 of the LTE standard. The DPD performance has been tested in an intensity modulation/direct detection (IM/DD) RoF mobile fronthaul system. Experimental results reveal that with a properly postdistorter modeling of the feedback RoF link it is possible to achieve Adjacent Channel Power Ratio (ACPR) and Error Vector Magnitude (EVM) values close to the results with an ideal feedback link.

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带反馈环的光纤无线移动前传的线性化

光纤无线电(RoF)链路数字预失真(DPD)的主要缺点是需要在实际场景中对远端无线电头(RRH)的输出信号进行反馈。在文献中，RoF移动前传架构中的数字预失真是一种理想的反馈系统，因此无法在实际系统中部署。我们建议使用RoF链路来反馈这些信号。这个RoF链路可以通过一个独立的RoF链路来完成，其中反馈信号从RRH发送到基带单元(BBU)。实验以2.65 GHz的20MHz-LTE下行信号(16QAM)在LTE标准的Band 7范围内进行。在强度调制/直接检测(IM/DD) RoF移动前传系统中对DPD性能进行了测试。实验结果表明，通过对反馈RoF链路进行适当的后失真建模，可以获得与理想反馈链路近似的相邻信道功率比(ACPR)和误差矢量幅值(EVM)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2017 26th Wireless and Optical Communication Conference (WOCC)

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