Real-time all-digital radio-over-fiber LTE transmission

Kerrebrouck, Joris Van; Breyne, Laurens; Li, Haolin; Bauwelinck, Johan; Torfs, Guy; Demeester, Piet; Bøhn, Thomas

doi:10.1109/rtuwo.2017.8228510

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…Despite their benefits, such as minimal electromagnetic intrusions, lower loss rates and larger bandwidth, RoF links suffer from channel and linear distortions caused by system components, which can be rectified using linearization methods [4][5][6][7][8][9]. Analog radio over fibre (A-RoF) [1][2][3][4][5][6][7][8][9][10], digital radio over fibre (D-RoF) [11,12] and sigma delta radio over fibre (S-DRoF) [13][14][15][16][17] are all different types of RoF implementations.…”

Section: Motivationmentioning

confidence: 99%

Experimental Evaluation of Hybrid Fibre–Wireless System for 5G Networks

Hadi

Song

Kumar

et al. 2022

Telecom

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This article describes a novel experimental study considering a multiband fibre–wireless system for constructing the transport network for fifth-generation (5G) networks. This study describes the development and testing of a 5G new radio (NR) multi-input multi-output (MIMO) hybrid fibre–wireless (FiWi) system for enhanced mobile broadband (eMBB) using digital pre-distortion (DPD). Analog radio over fibre (A-RoF) technology was used to create the optical fronthaul (OFH) that includes a 3 GHz supercell in a long-range scenario as well as a femtocell scenario using the 20 GHz band. As a proof of concept, a Mach Zehnder modulator with two independent radio frequency waveforms modifies a 1310 nm optical carrier using a distributed feedback laser across 10 km of conventional standard single-mode fibre. It may be inferred that a hybrid FiWi-based MIMO-enabled 5G NR system based on OFH could be a strong competitor for future mobile haul applications. Moreover, a convolutional neural network (CNN)-based DPD is used to improve the performance of the link. The error vector magnitude (EVM) performance for 5G NR bands is predicted to fulfil the Third Generation Partnership Project’s (3GPP) Release 17 standards.

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Section: Motivationmentioning

confidence: 99%

Experimental Evaluation of Hybrid Fibre–Wireless System for 5G Networks

Hadi

Song

Kumar

et al. 2022

Telecom

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“…2) Remote Radio Unit (RRU): At each RRU, the received optical signal is converted back to the electrical domain using a GaAs PIN photodiode with a responsivity around 0.4 A/W; the photodiode is impedance-matched to the low-noise amplifier (LNA), Mini-Circuits PMA3-83LN+, to maximize the power transfer at 3.5 GHz [27]. The LNA amplifies the electrical signal coming from the photodiode; it has a low noise figure of 1.3 dB and 20.8 dB gain when operating at 5V supply.…”

Section: A Mu-mimo Ofdm Signalmentioning

confidence: 99%

Distributed Multi-User MIMO Transmission Using Real-Time Sigma-Delta-Over-Fiber for Next Generation Fronthaul Interface

Caytan

et al. 2020

J. Lightwave Technol.

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To achieve the massive device connectivity and high data rate demanded by 5G, wireless transmission with wider signal bandwidths and higher-order multiple-input multiple-output (MIMO) is inevitable. This work demonstrates a possible function split option for the next generation fronthaul interface (NGFI). The proof-of-concept downlink architecture consists of real-time sigma-delta modulated signal over fiber (SDoF) links in combination with distributed multi-user (MU) MIMO transmission. The setup is fully implemented using off-the-shelf and in-house developed components. A single SDoF link achieves an error vector magnitude (EVM) of 3.14% for a 163.84 MHz-bandwidth 256-QAM OFDM signal (958.64 Mbps) with a carrier frequency around 3.5 GHz transmitted over 100 m OM4 multi-mode fiber at 850 nm using a commercial QSFP module. The centralized architecture of the proposed setup introduces no frequency asynchronism among remote radio units. For most cases, the 2×2 MU-MIMO transmission has little performance degradation compared to SISO, 0.8 dB EVM degradation for 40.96 MHzbandwidth signals and 1.4 dB for 163.84 MHz-bandwidth on average, implying that the wireless spectral efficiency almost doubles by exploiting spatial multiplexing. A 1.4 Gbps data rate (720 Mbps per user, 163.84 MHz-bandwidth, 64-QAM) is reached with an average EVM of 6.66%. The performance shows that this approach is feasible for the high-capacity hot-spot scenario.

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“…Various RoF variants have been proposed in recent years, including Analog Radio over Fiber (A-RoF) [1][2][3][4][5], Digital transport over Fiber (D-RoF) [6][7][8][9], Sigma Delta transport/Radio over Fiber (SD-RoF) [10][11][12], and others (see Figure 2). A-RoF links are, to some extent, the simplest and most cost-effective option; nonetheless, they suffer from nonlinearities generated from signal impairments and components such as laser modules, fiber, and photodiodes.…”

Section: Introductionmentioning

confidence: 99%

Practical Demonstration of 5G NR Transport Over-Fiber System with Convolutional Neural Network

Hadi

2022

Telecom

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This study describes an experimental realization using digital predistortion (DPD) for a fifth generation (5G) multiband new radio (NR) optical front haul (OFH) based Radio over Fiber (RoF) link. For the performance enhancement and complexity reduction of RoF links, a novel Convolutional Neural Network (CNN) based DPD technique is proposed, followed by comparisons with the generalised memory polynomial (GMP) based DPD method. To support enhanced mobile broad band scenario, the experimental testbed uses the 5G NR waveforms at 10 GHz with 20 MHz bandwidth and a flexible-waveform signal at 3 GHz with 20 MHz bandwidth. For 10 km of typical single mode fiber, a Mach Zehnder Modulator with two distinct radio frequency waveforms modulates a 1310 nm optical carrier utilizing distributed feedback laser. The error vector magnitude and number of estimated coefficients, and multiplications are all used to describe the experimental outcomes. The goal of the research is to see if CNN-based DPD improves performance while lowering complexity levels to meet 3GPP Release 17 criteria.

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Real-time all-digital radio-over-fiber LTE transmission

Cited by 6 publications

References 12 publications

Experimental Evaluation of Hybrid Fibre–Wireless System for 5G Networks

Experimental Evaluation of Hybrid Fibre–Wireless System for 5G Networks

Distributed Multi-User MIMO Transmission Using Real-Time Sigma-Delta-Over-Fiber for Next Generation Fronthaul Interface

Practical Demonstration of 5G NR Transport Over-Fiber System with Convolutional Neural Network

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