基于相位调制的集中式全双工无缝光子毫米波前端链路

IF 4 2区 计算机科学 Q1 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE
J. Bohata;M. Botella-Campos;J. Mora;B. Ortega;S. Zvanovec
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引用次数: 0

摘要

我们通过实验演示了一种基于相位调制的光子全双工无缝毫米波前端链路,以应对移动前端容量需求增加和网络密集化带来的挑战,从而实现 5G 及更高的目标。所提出的系统依靠相位调制技术,在中心局(CO)和远程射频头(RRH)实现下行链路(DL)信号的光频率上变频和下行链路(UL)信号的光调制。此外,我们的方法还包括在 RRH 中通过光学产生的本地振荡器(LO)信号对 40 GHz 的 UL 信号进行频率下变频,而用于 UL 数据传输的激光器则位于 CO,从而简化了远程站点的设备。光波形器在这里充当可编程光滤波器,为 DL 频率上变频、LO 生成和 UL 传输的光载波提供信号。在实验验证中,我们使用频率为 41 GHz 的 64-quadrature amplitude modulation(64-QAM)(用于下行链路)和频率为 40 GHz 的正交相移键控(QPSK)(用于上行链路)对所提议的系统进行了测试。值得注意的是,我们的研究结果表明,这两种数字调制方案都能成功传输高达 200 MHz 的带宽,同时将误差矢量幅度 (EVM) 保持在指定阈值以下。此外,当在全双工通信的两条链路中采用具有相同调制格式的 5G 新无线电(NR)正交频分复用(OFDM)信号时,我们实现了低至 5.2% 的下行链路 EVM 值和 6.9% 的上行链路 EVM 值,进一步凸显了我们提出的解决方案的功效和鲁棒性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Centralized full-duplex seamless photonic mmW fronthaul link based on phase modulation
We experimentally demonstrate a photonic full-duplex seamless millimeter wave fronthaul link, based on phase modulation, to address the challenges arising from the increased demands on the mobile fronthaul capacity and network densification toward 5G and beyond. The proposed system relies on phase modulation techniques, implemented at both the central office (CO) and remote radio head (RRH), to achieve optical frequency up-conversion of the downlink (DL) signal and optical modulation of the down-converted uplink (UL) signal. Furthermore, our approach includes the frequency down-conversion of the 40 GHz UL signal through an optically generated local oscillator (LO) signal in the RRH, while the laser employed for UL data transmission is situated at the CO, simplifying the remote site’s equipment. An optical waveshaper serves here as a programmable optical filter to provide signals for DL frequency up-conversion, LO generation, and also the optical carrier for UL transmission. In our experimental validation, we have tested our proposed system using 64-quadrature amplitude modulation (64-QAM) for the DL at a frequency of 41 GHz and quadrature phase shift keying (QPSK) for the UL at a frequency of 40 GHz. Notably, our results demonstrate the successful transmission of up to 200 MHz bandwidth for both digital modulation schemes, all while maintaining the error vector magnitude (EVM) well below the specified threshold. Additionally, when employing 5G new radio (NR) orthogonal frequency-division multiplexing (OFDM) signals with the same modulation formats for both links in full-duplex communication, we achieved EVM values as low as 5.2% for the DL and 6.9% for the UL, further highlighting the efficacy and robustness of our proposed solution.
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来源期刊
CiteScore
9.40
自引率
16.00%
发文量
104
审稿时长
4 months
期刊介绍: The scope of the Journal includes advances in the state-of-the-art of optical networking science, technology, and engineering. Both theoretical contributions (including new techniques, concepts, analyses, and economic studies) and practical contributions (including optical networking experiments, prototypes, and new applications) are encouraged. Subareas of interest include the architecture and design of optical networks, optical network survivability and security, software-defined optical networking, elastic optical networks, data and control plane advances, network management related innovation, and optical access networks. Enabling technologies and their applications are suitable topics only if the results are shown to directly impact optical networking beyond simple point-to-point networks.
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