Seamless Convergence of Fiber and Wireless Systems for 5G and Beyond Networks

Dat, Pham Tien; Kanno, Atsushi; Yamamoto, Naokatsu; Kawanishi, Tetsuya

doi:10.1109/jlt.2018.2883337

Cited by 88 publications

(27 citation statements)

References 33 publications

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“…This MMW band has gained increasing attention in recent years as part of the 5 th generation (5G) wireless networks [15,16]. In addition, the photonic up-conversion-based technique has been investigated by both the research community and the commercial sector in the past several years [17][18][19]. This is because the OCS offers significant advantages such as (i) relaxed requirements on RF components; (ii) higher tolerance to chromatic dispersion; (iii) wavelength reuse for the uplink; and (iv) lower phase noise due to the fact that the two sidebands are produced by the same laser.…”

Section: Introductionmentioning

confidence: 99%

M-QAM transmission over hybrid microwave photonic links at the K-band

Nguyen¹,

Bohata²,

Spáčil³

et al. 2019

Opt. Express

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Two experimental configurations of a hybrid K-band (25 GHz) microwave photonic link (MPL) are investigated for seamless broadband wireless access networks. Experimental configurations consist of optical fiber, free-space optics (FSO) and radio frequency (RF) wireless channels. We analyze in detail the effects of channel impairments, namely fiber chromatic dispersion, atmospheric turbulence and multipath-induced fading on the transmission performance. In the first configuration, transmission of the 64-quadrature amplitude modulation (QAM) signal with 5, 20 and 50 MHz bandwidths over 5 km standard single-mode fiber (SSMF), 2 m turbulent FSO and 3 m RF wireless channels is investigated. We show that, for QAM with a high bandwidth, the link performance is being affected more by atmospheric turbulence. In the second configuration, the 20 MHz 4/16/64-QAM signals over a 50 km SSMF and 40 m FSO/RF wireless links are successfully transmitted with the measured error vector magnitude (EVM) values of 12, 9 and 7.9%, respectively. It is shown that, for all transmitted microwave vector signals, the bit error rate is lower than the hard-decision forward-error-correction limit of 3.8×10 −3. Moreover, an extended FSO link span of 500 m for 25 GHz hybrid MPL with 16-QAM at 10 Gb/s under the weak and strong turbulence regimes is evaluated via simulation analysis to mimic a practical outdoor system.

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Section: Introductionmentioning

confidence: 99%

M-QAM transmission over hybrid microwave photonic links at the K-band

Nguyen¹,

Bohata²,

Spáčil³

et al. 2019

Opt. Express

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“…Due to the uncertainty of the channel characteristics at very high frequencies far above the current 212 MHz G.fast ceiling, e.g. for 424 or 848 MHz G.mgfast profiles, as well as to the strict power constraints over these bands, 5 the enormous peak-to-average-power ratio (PAPR) of conventional DMT with long CP overhead might not be tolerable for future performance requirements. For the sake of good power efficiency, the generalized frequency-division multiplexing (GFDM) technique [73] may be used as an alternative, due to its reduced CP usage and lower implementation complexity compared to OFDM/DMT yet using a similar structure (as showcased in [74]).…”

Section: ) Modulationmentioning

confidence: 99%

Far-End Crosstalk Mitigation for Future Wireline Networks Beyond G.mgfast: A Survey and an Outlook

Zhang

et al. 2020

IEEE Access

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With the escalating demand for high speed, high reliability, low latency, low cost and ubiquitous connectivity, the telecommunications industry is entering a new era where the ultimate optimality of the current wireline-wireless access network has to be achieved. Regarding the current wireline network paradigm, dominated by the copper-based digital subscriber lines (DSL) technology, multi-Gigabit data rate is the ambitious design objective at the customer end for the forthcoming ITU-T G.mgfast standard. In order to prepare for the new challenges in the era of total network convergence, both the wireline and the wireless community must be able to think beyond their respective conventions and learn from each other if necessary. Overall, the current DSL-based wireline network architecture is prone to the mutual interference resulting in far-end crosstalk (FEXT). The newly expanded 424/848 MHz spectrum of the ambitious G.mgfast project introduces far higher FEXT than that over the current 212/30 MHz G.fast/VDSL2 band. Additionally, the coexistence of multiple standards will also cause 'alien' FEXT. In these cases, using the plain zero forcing precoding (ZFP) will no longer attain a sufficiently high performance. However, as shown in the field of wireless communications, using lattice reduction as a signal space remapping technique significantly improves the performance of traditional multiuser detectors (MUD) and of the respective multiuser precoders (MUP). These promising techniques have largely remained unexploited in commercial wireless communications, due to their complexity in the face of the rapidly fluctuating wireless channels. In this survey, we present an overview of the state-of-the-art in wireline access network and an outlook for recent technological advances in the holistic 'wireline + wireless' access network in the context of network convergence, focusing on the dominant challenge of FEXT mitigation in future DSL networks. Against this background, we investigate both the family of linear precoding and of the Tomlinson-Harashima precoding (THP) schemes conceived for classic DSL. Furthermore, we present a tutorial on the family of lattice reduction aided MUPs, as well as quantifying their expected performances in realistic DSL scenarios. As a by-product, we also demonstrate the duality between MUP and MUD, in the hope that the fifty years' history of MUD could be used to accelerate the development of efficient near-optimal MUPs for future DSL. Under the recommended operating conditions of the 212 MHz profile of G.fast, our benchmark comparisons indicate that the lattice reduction aided techniques are very powerful compared to conventional schemes. In particular, their good performances do not rely on optimized spectrum balancing, and they are also shown to be relatively robust against channel state information (CSI) estimation error, under the assumption of perfectly time-invariant DSL channels.

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“…The complexity associated with the electronic generation of the mm-wave carriers hinders its deployment in future mobile networks and hence photonic generation techniques have been proposed. Optical heterodyning, wherein two optical carriers with a spacing equal to the desired RF carrier frequency beat on a high-speed photodetector, has been studied extensively for mm-wave generation [12]- [19]. The optically compatible A-RoF fronthaul network can facilitate the distribution of mmwave carriers to various RRH sites through the same fiber network leading the way for centralization of the resources.…”

Section: Introductionmentioning

confidence: 99%

Optical Heterodyne Analog Radio-Over-Fiber Link for Millimeter-Wave Wireless Systems

Delmade

Browning

Vérolet

et al. 2021

J. Lightwave Technol.

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Optical heterodyne analog radio-over-fiber (A-RoF) links provide an efficient solution for future millimeter wave (mmwave) wireless systems. The phase noise of the photo-generated mm-wave carrier limits the performance of such links, especially, for the transmission of low subcarrier baud rate multi-carrier signals. In this work, we present three different techniques for the compensation of the laser frequency offset (FO) and phase noise (PN) in an optical heterodyne A-RoF system. The first approach advocates the use of an analog mm-wave receiver; the second approach uses standard digital signal processing (DSP) algorithms, while in the third approach, the use of a photonic integrated mode locked laser (MLL) with reduced DSP is advocated. The compensation of the FO and PN with these three approaches is demonstrated by successfully transmitting a 1.95 MHz subcarrier spaced orthogonal frequency division multiplexing (OFDM) signal over a 25 km 61 GHz mm-wave optical heterodyne A-RoF link. The advantages and limitations of these approaches are discussed in detail and with regard to recent 5G recommendations, highlighting their potential for deployment in next generation wireless systems.

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Seamless Convergence of Fiber and Wireless Systems for 5G and Beyond Networks

Cited by 88 publications

References 33 publications

M-QAM transmission over hybrid microwave photonic links at the K-band

M-QAM transmission over hybrid microwave photonic links at the K-band

Far-End Crosstalk Mitigation for Future Wireline Networks Beyond G.mgfast: A Survey and an Outlook

Optical Heterodyne Analog Radio-Over-Fiber Link for Millimeter-Wave Wireless Systems

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