A Simple Envelope-Assisted RF/IF Digital Predistortion Model for Broadband RoF Fronthaul Transmission

A Simple Envelope-Assisted RF/IF Digital Predistortion Model for Broadband RoF Fronthaul Transmission
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用于宽带 RoF 前传传输的简单包络辅助 RF/IF 数字预失真模型

DOI:
10.1109/jlt.2018.2846883
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发表时间:
2018-10
影响因子:
4.7
通讯作者:
Xiupu Zhang
Xiupu Zhang
中科院分区:
工程技术2区
文献类型:
--
作者:
Weijie Tang;Ming Hu;Taijun Liu;Dongya Shen;Xiupu Zhang

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对于新兴的5G前端,宽带光纤无线电(ROF)传输被发现比传统的数字光纤传输更具成本效益。当前的数字预失真(DPD)技术在线性化宽带ROF链路中可能不是有效的。提出了一种简单的包络辅助射频(RF)/中频(IF)DPD模型,用于宽带/多频段ROF传输的线性化。该模型同时使用RF/IF信号和基带包络,即使在高信号带宽的情况下,也可以有效地缓解短期和长期记忆效应。该模型的复杂度低于现有的基带DPD,且不随信号频带的增加而增加。该模型在三个场景中进行了实验评估:两个间隔100和40 MHz的20 GHz长期演进(LTE)信号,以及三个间隔50 MHz的20 MHz LTE信号。结果表明,所提出的DPD具有与目前的基带模型相当的性能。
For emerging 5G fronthaul, broadband radio over fiber (RoF) transmission has been found much more cost-effective than conventional digital fiber transmission. Current digital predistortion (DPD) techniques may not be effective in linearizing broadband RoF links. This work presents a simple envelope-assisted radio frequency (RF)/intermediate frequency (IF) DPD model for linearization of broadband/multiband RoF transmission. The model uses both RF/IF signals and baseband envelopes, resulting in the short-term and long-term memory effect mitigated efficiently even for high signal bandwidth. The model complexity is lower than the existing baseband DPDs and does not increase with the increase of the signal bands. The model is experimentally evaluated in three scenarios: two 20 MHz long-term evolution (LTE) signals spaced by 100 and 40 MHz, and three 20 MHz LTE signals spaced by 50 MHz. It is shown that the proposed DPD results in comparable performance as today's baseband models.
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