The new flexible mobile fronthaul: Digital or analog, or both?

Gomes, Nathan J.; Assimakopoulos, Philippos; Al-Hares, Mohamed Kenan; Habib, Usman; Noor, Shabnam

doi:10.1109/icton.2016.7550322

Cited by 16 publications

(7 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Fig. 8, at the DU, one part of the optical carrier is intensity modulated by the up-converted multiplex, with an MZM biased at an optimum working point between quadrature and null [4]. The resulting spectrum (one-sided) at the output of the photodiode at the RRU is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The combining process, depicted in Fig. 5, of several single-IFFT stage outputs is carried out in the time domain (discrete or continuous) and is akin to traditional power combining carried out in optical-SCM systems [4], [10]. Significantly, the different single-IFFT stage outputs can be created with different sampling rates allowing different OFDM numerologies to be combined.…”

Section: Signal Multiplexing and Nyquist Zone Mapping Technique Conceptsmentioning

confidence: 99%

“…efficiency and reduced latency, allowing joint processing of signals at the Distributed Unit (DU). Therefore, there is renewed interest in the use of analog Radio over Fiber (RoF) techniques in next generation mobile networks [4]- [7].…”

mentioning

confidence: 99%

See 2 more Smart Citations

A Flexible Subcarrier Multiplexing System With Analog Transport and Digital Processing for 5G (and Beyond) Fronthaul

Noor

Assimakopoulos

Gomes

2019

J. Lightwave Technol.

Self Cite

View full text Add to dashboard Cite

A flexible subcarrier multiplexing system combining analog transport with digital domain processing is presented. By making use of bandpass sampling and applying a systematic mapping of signals into available Nyquist zones, the multiplexing system is able to present multiple signals at the same intermediate frequency at the remote site. This simplifies the processing required for multiple antenna systems. We further propose the use of trackand-hold amplifiers at the remote site. These elements are used to extend the mapping to a mapping hierarchy, offering flexibility in frequency placement of signals and relaxation of analog-to-digital converter bandwidth and sampling rate constraints. The system allows the transport of different numerologies in a number of next generation radio access network scenarios. Experimental results for large signal multiplexes with both generic and 5th-generation mobile numerologies show error-vector magnitude performance well within specifications, validating the proposed system. Simulation results from a system model matched to these experimental results provide performance predictions for larger signal multiplexes and larger bandwidths. Index Terms-Digital signal processing, massive-MIMO (mMIMO), millimeter wave (mmW), mobile fronthaul, radioover-fiber, subcarrier multiplexing (SCM). I. INTRODUCTIONT HE establishment of heterogeneous networking and multiantenna techniques as norms for next generation radio access networks (RANs) means that new network architectures will need to be employed that can seamlessly accommodate such features. These architectures will have to meet differing requirements in terms of data rate, latency constraints, system complexity and cost.Analog transport within the fronthaul, as an alternative to digital transport based either on centralized processing with the Common Public Radio Interface (CPRI) [1], or on alternative functional decompositions [2], [3], can provide high spectral

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Signal Multiplexing and Nyquist Zone Mapping Technique Conceptsmentioning

confidence: 99%

See 1 more Smart Citation

A Flexible Subcarrier Multiplexing System With Analog Transport and Digital Processing for 5G (and Beyond) Fronthaul

Noor

Assimakopoulos

Gomes

2019

J. Lightwave Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, the radio-over-fiber (RoF) technology is effective in MMW wireless systems. [5][6][7] By converting MMW signals into lightwave (LW) signals and transmitting them using a silica optical fiber with extremely low loss (∼0.2 dB=km) and negligible crosstalk, it is possible to transfer high-quality MMW signals over a long distance. 8,9) One drawback of the MMW RoF system is the signal fading caused by the chromatic dispersion effect of the silica optical fiber when the conventional double-sideband (DSB) modulation technique is used for MMW-LW single conversion, although this problem can be overcome by single-sideband (SSB) modulation.…”

Section: Introductionmentioning

confidence: 99%

Millimeter-wave band optical single-sideband modulator using array-antenna-electrode and polarization-reversed structures with asymmetric Mach–Zehnder waveguide

Matsukawa

Inoue

Murata

et al. 2018

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

The radio-over-fiber (RoF) technology is effective in millimeter-wave (MMW) wireless systems for future broadband massive mobile communication. In constructing MMW RoF systems, a device for converting MMW signals into lightwave signals is important. In particular, a conversion device for optical single-sideband (SSB) modulation is rather attractive since the signal fading caused by the chromatic dispersion effect of an optical fiber does not occur. We have proposed a new optical SSB modulator using array-antenna-electrode and polarization-reversed structures with an asymmetric Mach-Zehnder waveguide for MMW band RoF systems. By introducing polarization-reversed structures in electrooptic modulators, it is possible to control the optical modulation phase arbitrarily. Therefore, by combining with an asymmetric Mach-Zehnder waveguide, we can obtain the SSB optical modulation in the MMW band without an external power supply. In the experiment, SSB modulation characteristics and the switching of enhanced sidebands were successfully demonstrated in the 60 GHz band.

show abstract

“…Analog RoF (A-RoF) was then identified among the solutions to this matter [4] [5] [6] [7]. In fact, A-RoF has been of research interest for over 25 years and conducted to commercial solutions deployed mainly indoors (stadiums, subway stations…) known as Distributed Antenna Systems (DAS) [8]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Real time demonstration of fronthaul transport over a mix of analog and digital RoF

Tayq

Neto

Saliou

et al. 2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

View full text Add to dashboard Cite

show abstract

The new flexible mobile fronthaul: Digital or analog, or both?

Abstract: The version in the Kent Academic Repository may differ from the final published version. Users are advised to check http://kar.kent.ac.uk for the status of the paper. Users should always cite the published version of record.

Cited by 16 publications

References 7 publications

A Flexible Subcarrier Multiplexing System With Analog Transport and Digital Processing for 5G (and Beyond) Fronthaul

A Flexible Subcarrier Multiplexing System With Analog Transport and Digital Processing for 5G (and Beyond) Fronthaul

Millimeter-wave band optical single-sideband modulator using array-antenna-electrode and polarization-reversed structures with asymmetric Mach–Zehnder waveguide

Real time demonstration of fronthaul transport over a mix of analog and digital RoF

Contact Info

Product

Resources

About