Linearity Measurements on a 5G mmWave Fiber Wireless IFoF Fronthaul Link With Analog RF Beamforming and 120° Degrees Steering

Vagionas, Christos; Ruggeri, Eugenio; Tsakyridis, Apostolos; Kalfas, George; Leiba, Yigal; Miliou, Amalia; Pleros, Nikos

doi:10.1109/lcomm.2020.3019733

Cited by 17 publications

(13 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, several mmWave RAUs implementing electrical beamforming [43], [50]- [53] have been proposed. In [50], [51], each dipole AE of the 32-element planar array is connected to a phase shifter and amplifier, enabling high beamforming flexibility at the cost of complexity. The adopted intermediate-frequency-over-fiber (IFoF) architecture requires local oscillator (LO) distribution to each RAU and burdens the RAU with frequency translation, thereby increasing its cost and power consumption.…”

Section: State Of the Art And Future Workmentioning

confidence: 99%

Air-Filled SIW Remote Antenna Unit With True Time Delay Optical Beamforming for mmWave-Over-Fiber Systems

Paula

Bogaert

Caytan

et al. 2022

J. Lightwave Technol.

View full text Add to dashboard Cite

A low-complexity and efficient mmWave-over-fiber remote antenna unit (RAU) is proposed that enables broadband transmission and wide-angle squint-free beam steering in the full [26.5-29.5] GHz n257 5G band. It leverages an in-house developed optical beamforming network (OBFN), implemented on a silicon photonics integrated circuit, and a broadband optically enabled 1x4 uniform linear array (ULA), enabling grating-lobe-free beam steering between [-50 • , 50 • ]. The antenna elements (AEs) of the ULA are implemented in air-filled substrate-integratedwaveguide technology. They adopt a novel improved aperturecoupled feeding scheme to achieve high efficiency, high isolation and minimal back radiation over a broad frequency band. Each AE is compactly integrated and co-optimized with a dedicated opto-electrical transmit chain, maximizing the RAU's performance, including beamforming flexibility and energy efficiency, while minimizing its size. The separately packaged OBFN implements true-time-delay beamforming by means of four switchable optical delay lines that are capable of discretely tuning the delay difference between AEs with a resolution of 1.6 ps, up to a maximum delay of 49.6 ps to fully exploit the ULA's full grating-lobe-free scan range. Measurements show that the AEs are excellently matched in the [25.1-30.75] GHz band, exhibit high isolation (>15 dB) in the operating band, and feature a stable peak gain of 6.8±0.72 dBi with a beamwidth of at least 95 • . Additionally, optical beamforming was successfully demonstrated by steering the RAU's beam towards angles up to 51.8 • , with a maximum gain degradation below 0.6 dB. Finally, the optically enabled 1×4 ULA successfully establishes a 64-QAM wireless communication link at 2.2 Gbaud (13.2 Gbps) while beam steering up to 50 • with an error vector magnitude below 7.6%.

show abstract

Section: State Of the Art And Future Workmentioning

confidence: 99%

Air-Filled SIW Remote Antenna Unit With True Time Delay Optical Beamforming for mmWave-Over-Fiber Systems

Paula

Bogaert

Caytan

et al. 2022

J. Lightwave Technol.

View full text Add to dashboard Cite

show abstract

“…However, while considering the long‐range networks, the nonlinearities due to the combination of fiber chromatic dispersion and laser frequency chirp are usually the main cause of signal impairment 7 . However, the non‐idealities owing to laser and possibly to photodiode are of paramount importance as discussed in 18–23 …”

Section: Introductionmentioning

confidence: 99%

“…7 However, the non-idealities owing to laser and possibly to photodiode are of paramount importance as discussed in. [18][19][20][21][22][23] In this paper, multiband 5G NR based Radio over Fiber link equipped with MSA-DPD is presented as an OFH solution to cover enhanced mobile broad band (eMBB) scenarios for 3 and 20 GHz, respectively. A dual drive Mach-Zehnder modulator (MZM) is used with a 1310 nm distributed feedback (DFB) laser for a fiber link length of 22 km.…”

Section: Introductionmentioning

confidence: 99%

Enhancing5Gmulti‐bandlong haul optical fronthaul links performance by magnitude‐selective affine digital predistortion method

Hadi

Soin

Kausar

2022

Micro & Optical Tech Letters

View full text Add to dashboard Cite

This paper presents a novel magnitude-selective affine (MSA) based digital predistortion (DPD) method for the performance investigation of multiband 5G new radio (NR) based analog radio over fiber link. The proposed MSA-DPD method is derived from the canonical piecewise linear (CPWL) based model by employing MSA functions, which can result in reduction of the number of multiplication operations and the model complexity. The 5G NR standard at 20 GHz with 50 MHz bandwidth and flexible-waveform signal at 3 GHz with 20 MHz bandwidth is used. A dual drive Mach Zehnder modulator having two distinct RF signals modulates a 1310 nm optical carrier using distributed feedback laser for 22 km of standard single mode fiber. The proposed MSA-DPD method is compared with the CPWL and generalized memory polynomial method. The experimental results are presented in terms of adjacent channel power ratio, error vector magnitude, number of estimated coefficients and multiplications suggesting that MSA-DPD method achieves a better performance as compared to CPWL and GMP models with much lesser complexity meeting the 3GPP Release 17 requirements.

show abstract

“…Moreover, in fiber‐wireless integrated systems, the nonlinearities become serious when the analog fiber and wireless links are cascaded together 8 . They may arise due to nonlinear laser transfer function, 9,10 combined effect of laser chirp and fiber chromatic dispersion, 11 fiber kerr nonlinearity, 12 and due to various non‐linearities attributed to the microwave photonic link, expected to be further exacerbated by the radio frequency chain of beamforming phased array antennas 13 . The generation of inadmissible specious terms is due to nonlinear characteristics of laser and perhaps PD.…”

Section: Introductionmentioning

confidence: 99%

Enhancing distributed feedback‐standard single mode fiber‐radio over fiber links performance by neural network digital predistortion

Hadi

Murtaza

2021

Micro & Optical Tech Letters

View full text Add to dashboard Cite

This letter presents a novel neural network (NN) based digital predistortion (DPD) technique to obliterate the signal impairments and nonlinearities in radio over fiber (RoF) systems. DPD is generally performed with volterra based procedures that utilizes indirect learning architecture (ILA) that can become complex and expensive computationally. The proposed method using NNs evades issues associated with ILA and utilizes a NN to first model the RoF link and then training a NN based predistorter by backpropagating through the RoF NN model. Furthermore, the experimental evaluation is carried out for long term evolution 20-MHz 256-QAM modulation signal using 1310 nm distributed feedback laser, and standard single-mode fiber to establish a comparison between NN based RoF link and volterra based generalized memory polynomial using ILA. The efficacy of the DPD is examined by reporting adjacent channel power ratio, mean square error, and error vector magnitude. The experimental findings imply that NN-DPD convincingly learns the RoF nonlinearities which may not suit a volterra based model, and hence may offer a favorable trade-off in terms of computational overhead and DPD performance.

show abstract

Linearity Measurements on a 5G mmWave Fiber Wireless IFoF Fronthaul Link With Analog RF Beamforming and 120° Degrees Steering

Cited by 17 publications

References 36 publications

Air-Filled SIW Remote Antenna Unit With True Time Delay Optical Beamforming for mmWave-Over-Fiber Systems

Air-Filled SIW Remote Antenna Unit With True Time Delay Optical Beamforming for mmWave-Over-Fiber Systems

Enhancing5Gmulti‐bandlong haul optical fronthaul links performance by magnitude‐selective affine digital predistortion method

Enhancing distributed feedback‐standard single mode fiber‐radio over fiber links performance by neural network digital predistortion

Contact Info

Product

Resources

About