Achieving Ultra-Reliable Low-Latency Communications: Challenges and Envisioned System Enhancements

Ultra-reliable low-latency communications (URLLC) have the potential to enable a new range of applications and services: from wireless control and automation in industrial environments, to self-driving vehicles. The fifth generation (5G) wireless systems are faced by different challenges for supporting URLLC. Some of the challenges, particularly in downlink direction, are ...

SDN-based Wi-Fi Direct Clustering for Cloud Access in Campus Networks

  • Hamidouche L.
  • Iskounen S.
  • Mathieu F.
  • Monnet S.
  • Nguyen T.

Mobile cloud is changing the way to enroll teaching activities in university campus. Lectures and lab sessions can be carried out directly from tablets in a class room by accessing a server in the cloud. In this paper, we address the problem of high density cloud access with wireless devices ...

Collaborative Energy and Information Transfer in Green Wireless Sensor Networks for Smart Cities

  • Gong Y.
  • Liu X.
  • Lu W.
  • Peng H.
  • Wu J.

Smart city is able to make the city source and infrastructure more efficiently utilized, which improves the quality of life for citizens. In this framework, wireless sensor networks (WSNs) play an important role to collect, process, and analyze the corresponding information. However, the massive deployment of WSNs consumes a significant ...

Coded Tandem Spreading Multiple Access for Massive Machine-Type Communications

  • Ai B.
  • Chen X.
  • Guan H.
  • Ma G.
  • Wang F.
  • Zhao Z.
  • Zhong Z.

Future IoT applications provoke the connectivity and reliability requirements of machine-type communications, which yield mMTC and URLLC, respectively. In mMTC, grant-free NOMA is adopted to serve massive machine-type devices with low signaling overhead. The challenge of grantfree NOMA for mMTC is the collision induced by non-orthogonal resource allocation. Various grantfree ...

Channel estimation and throughput evaluation for 5G wireless communication systems in various scenarios on high speed railways

  • He R.
  • Wang G.
  • Wang X.
  • Zhao Y.
  • Zhao Z.
  • Zou Y.

The fifth generation (5G) wireless communication is currently a hot research topic and wireless communication systems on high speed railways (HSR) are important applications of 5G technologies. Existing studies about 5G wireless systems on high speed railways (HSR) often utilize ideal channel parameters and are usually based on simple scenarios. ...

UL SRS Coordination in 5G Massive MIMO Systems

  • Baracca P.
  • Campanalonga L.
  • Galati Giordano L.
  • Garcia Rodriguez A.
  • Geraci G.
  • Lopez-Perez D.
  • Magarini M.

In massive multiple input multiple output (MIMO) systems operating in time division duplex (TDD), users connected to different base stations (BSs) transmit uplink (UL) pilot sequences to allow channel estimation for both UL and downlink (DL) directions. The ongoing standardization activity around the fifth generation (5G) of communication systems is ...

Scheduling in multi-wavelength ring-based optical networks-on-chip

Synchronous networks-on-chip (NoC) require tailored schedulers achieving low latency, high throughput, and fairness while avoiding packet collisions. Efficient schedulers exist for rearrangeable non-blocking NoC. However, NoCs fabricated in integrated photonics typically suffer a blocking behavior due to the limitations of the switching capabilities in the space and wavelength domains. This ...

Variable-rate ultra-reliable and low-latency communication for industrial automation

Ultra-reliable and low-latency communications (URLLC) is an increasingly important aspect of wireless communications in the 5th generation mobile networks (5G) era, specifically in the context of wireless mission-critical communications for factory automation. This paper proposes a pilot-assisted variable rate URLLC scheme for the downlink (DL) of a factory automation network ...

Benefit of progressive deployment of regenerators along with traffic growth in WDM elastic networks

  • Morea A.
  • Pesic J.
  • Zami T.

We present a new strategy of regenerator placement along with traffic growth in the elastic WDM networks, by introducing additional regenerators on the already allocated connections only from when needed to accommodate extra demand of capacity

MIMO Equalization for High-Speed Communication Under Channel Variability

  • Dries Vande Ginste
  • Guenach M.
  • Jelle Bailleul
  • Lennert Jacobs
  • Marc M.
  • Paolo Manfredi

High-speed communication over mutually coupled channels can be severely affected by intersymbol interference (ISI) and crosstalk (XT). Multiple-input multiple-output (MIMO) equalization is known to mitigate both ISI and XT, but requires accurate channel information at the receiver (RX) and/or transmitter (TX) when the channel is stochastic. However, since adjusting the ...

Ultra-High Bandwidth Integrated Lithium Niobate Modulators with Record-Low Vpi

  • Bertrand M.
  • Chen X.
  • Loncar M.
  • Sethumadhavan C.
  • Shams-Ansari A.
  • Wang C.
  • Winzer P.
  • Zhang M.

We demonstrate integrated lithium niobate electro-optic modulators with up to 100-GHz electro-optic bandwidth and Vpi as low as 1.4 V. We show 70 GBaud and 100 GBuad m-ASK modulation with the fabricated modulator.

Record-High 17.3-bit/s/Hz Spectral Efficiency Transmission over 50 km Using Probabilistically Shaped PDM 4096-QAM

  • Burrows E.
  • Chen X.
  • Cho J.
  • Olsson S.
  • Sethumadhavan C.
  • Winzer P.

We demonstrate transmission of a 10-subcarrier superchannel with a record-high intra-channel spectral efficiency of 17.3 bit/s/Hz over 50-km backward Raman amplified Corning Vascade EX2000 fiber using 3-GBd probabilistically shaped PDM 4096-QAM.

Scalable Mode sorter supporting 210 Hermite-Gaussian modes

  • Carpenter J.
  • Chen H.
  • Fontaine N.
  • Kim K.
  • Neilson D.
  • Ryf R.

We demonstrate a multi-plane light conversion device based on 7 planes which maps Hermite-Gaussian spatial modes with indices (m,n) onto a Cartesian grid (x,y) of diffraction limited spots for 210 spatial modes.

Balancing Probabilistic Shaping and Forward Error Correction for Optimal System Performance

  • Cho J.

We review probabilistic shaping (PS) and forward error correction (FEC) and study the interplay between the two to jointly maximize the overall information rate.

SOA for future PONs

  • Bonk R.

SOA applicability to provide up to 35 dB power budget for high-rate T(W)DM-PON is analyzed. Booster and pre-amplifier in PON-applications will have utmost importance in 50 Gbit/s/wavelength IM-DD and could also be applied in coherent access solutions.

Nonlinear propagation equations for arbitrary levels of random linear coupling between modes

  • Agrawal G.
  • Buch S.
  • Essiambre R.
  • Mumtaz S.
  • Tulino A.

We derive expressions that enable the study of the impact of arbitrary levels of linear coupling between spatial modes on nonlinear propagation in space-division multiplexed transmission systems, valid for both multimode and coupled-core fibers.

First Demonstration of an Ultra-Low-Latency Fronthaul Transport Over a Commercial TDM-PON Platform

  • Bidkar S.
  • Galaro J.
  • Pfeiffer T.

We demonstrate for the first time, feasibility of latency-critical mobile fronthaul (CPRI) transport over a 6 km PON infrastructure with co-existing residential broadband traffic using a standards-compliant commercial TDM-PON platform with a sub-200 µs round trip delay.

Using Raman Gain to Offset Excess Losses of an Intelligent Optical Distribution Network in a TWDM PON

  • Iannone P.
  • Straub M.

We use bi-directional distributed Raman amplification to offset the excess losses of an intelligent splitter module. We demonstrate this technique in a 42-km, 1:32 split, TWDM PON.

Observe-Decide-Act: Experimental Demonstration of Self-Healing Network

  • Delezoide C.
  • Kostas Christodoulopoulos
  • Nicola Sambo

We experimentally demonstrate a self-healing network using monitoring information to reconfigure faulty links through SDN

Fiber type dependent benefits when deploying up-to-300Gb/s elastic transponders adapting to ageing of margins

  • Pesic J.
  • Rossi N.
  • Zami T.

We compare cost savings when planning a WDM French backbone network based on SSMF or LEAF, with 32 GBaud elastic optical transponders adapting their capacity from 100 Gb/s to 300 Gb/s to the actual ageing margins.