Experimental Investigations on Power Spectral Density Estimation in Heterogeneous Dispersion Unmanaged Transmissions

In this paper, we present and we verify by experiments a semi-analytical model to estimate the power spectral density of the noise-to-signal ratio in heterogeneous dispersion unmanaged transmissions. The model combines an experimental step and an analytical formula. After a one-span profiling calibration, the overall system performance is assessed by ...

Cache-Friendly IP Reassembly Network Function

In the emerging SD-WAN environments, network packets are heavily encapsulated to support various policy-driven network slices and secure connectivity. While such heavy encapsulation increases the chance of IP fragmentation in SD-WAN traffic, existing mechanisms to avoid IP fragmentation such as path MTU discovery, TSO/GSO and pre-fragmentation are often not sufficient. ...

Phase Retrieval with Fast Convergence Employing Parallel Alternative Projections and Phase Reset for Coherent Communications

Phase-retrieval (PR) receivers can reconstruct complex valued signals using only direct detection without the use of any optical carriers. We propose and demonstrate two PR receiver solutions with faster and better convergence. First, we demonstrate a PR receiver based on parallel alternative projections that are produced by propagating the signal ...

Deep Learning for Video Compressive Sensing

We investigate deep learning for video compressive sensing within the scope of snapshot compressive imaging (SCI). In video SCI, multiple high-speed frames are modulated by different coding patterns and then a low-speed detector captures the integration of these modulated frames. In this manner, each captured measurement frame incorporates the information ...

Experimental characterization of Sigma Delta Radio over fiber system for 5G C-RAN downlink

© 2020 The Korean Institute of Communications and Information Sciences (KICS) Radio over Fiber is a promising technology for the 5G Cloud Radio Access Network. We demonstrate experimentally Sigma Delta Radio over Fiber by means of Sigma Delta Modulator (SDM) subsequently replacing expensive digital to analog converters. A second order ...

Impact of Channel Non-Reciprocity in Cell-Free Massive MIMO

In cell-free (CF) massive MIMO, a large number of access points (APs) distributed over the coverage area jointly serve a set of users over the same time/frequency resources. In this letter, we study the impact of channel non-reciprocity (NRC) and imperfect channel state information in CF massive MIMO systems. We ...

Realistic phase screen model for forward multiple-scattering media

© 2020 Optical Society of America Existing random phase screen (RPS) models for forward multiple-scattering media fail to incorporate ballistic light. In this Letter, we redesign the angular spectrum of the screen by means of Monte Carlo simulation based on an assumption that a single screen should represent all the ...

Blockchain moderated by empty blocks to reduce the energetic impact of crypto-moneys

© 2020 While cryptocurrencies and blockchain applications continue to gain popularity, their energy cost is evidently becoming unsustainable. In most instances, the main cost comes from the required amount of energy for the Proof-of-Work, and this cost is inherent to the design. In addition, useless costs from discarded work (e.g., ...

Temporal and spectral coding over amplified spontaneous emission for secure optical coherent communications

© 2020 Optical Society of America We demonstrate secure optical coherent communications employing low-coherence matched detection based on the randomness of amplified spontaneous emission (ASE) noise. Two-level physical-layer optical encryption is achieved through temporal and spectral coding over a broadband ASE source. An ASE-carried signal and unmodulated carrier are polarization ...

High Heat Flux Evaporation of Low Surface Tension Liquids from Nanoporous Membranes

Water is often considered as the highest performance working fluid for liquid-vapor phase change due to its high thermal conductivity and large enthalpy of vaporization. However, a wide range of industrial systems require using low surface tension liquids where heat transfer enhancement has proved challenging for boiling and evaporation. Here, ...

Epitaxial Growth of High-Quality AlGaInAs-based Active Structures on a Directly-Bonded InP-SiO2/Si Substrate

Hybrid integration of III-V materials onto silicon by wafer bonding technique is one of the mature and promising approaches to develop advanced photonic integrated devices into the Silicon Photonics Platform (SPP). Epitaxial regrowth of III-V materials on InP bonded to an oxidized silicon wafer (InPoSi) is the next step to ...

A Channel Model for Indoor Time-of-Arrival Ranging

We executed an indoor measurement campaign to statistically characterize the bias in time of arrival (ToA) estimates incurred by multipath in the 5.5 GHz industrial, scientific and medical band by transmitting 10 and 100 MHz bandwidth waveforms. Measurements in three buildings with different propagation conditions are performed to analyze ToA ...

Video Multimethod Assessment Fusion (VMAF) on 360VR Contents

© 1975-2011 IEEE. This paper describes the process carried out to validate the application of one of the most robust and influential video quality metrics, Video Multimethod Assessment Fusion (VMAF), to 360VR contents. VMAF is a full reference metric initially designed to work with traditional 2D contents. Hence, at first, ...

Editorial (JLT Special Issue on DSP in Next Generation Optical Access Networks)

This IEEE/OSA Journal of Lightwave Technology Special Issue was inspired by a workshop titled DSP for next generation optical access, which we organized for the European Conference on Optical Communication in 2018 in Rome, Italy.

Multiplierless Filtered-OFDM Transmitter for Narrowband IoT Devices

In cyclic-prefix orthogonal frequency-division multiplexing (CP-OFDM)-based radio access, the coexistence of different technologies without precise time-frequency synchronization is limited due to high out-of-band (OOB) emissions. Therefore, the spectrum enhancement techniques play a key role in relaxing the synchronization and power control requirements. This allows a higher degree of opportunistic spectrum ...

Input Pattern Classification Based on the Markov Property of the IMBT with Related Equations and Contingency Tables

In this contribution, we provide a detailed analysis of the search operation for the Interval Merging Binary Tree (IMBT), an efficient data structure proposed earlier to handle typical anomalies in the transmission of data packets. A framework is provided to decide under which conditions IMBT outperforms other data structures typically ...

Nonlinear Lattice-Reduction Based Precoding Design for Downstream G.fast Transmission

As a non-linear precoding alternative to Tomlinson-Harashima precoding (THP), in this paper, so-called lattice reduction aided precoding (LRP) is considered as a crosstalk precompensation technique for downstream transmission in G.fast DSL networks. First, a practically achievable bit-rate expression for LRP is proposed in function of the precoder and integer matrix. ...

Feasibility and Health Benefits of an Individualized Physical Activity Intervention in Women With Metastatic Breast Cancer: Intervention Study

©Lidia Delrieu, Vincent Pialoux, Olivia Pérol, Magali Morelle, Agnès Martin, Christine Friedenreich, Olivia Febvey-Combes, David Pérol, Elodie Belladame, Michel Clémençon, Eva Roitmann, Armelle Dufresne, Thomas Bachelot, Pierre Etienne Heudel, Marina Touillaud, Olivier Trédan, Béatrice Fervers. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 28.01.2020. BACKGROUND: There is limited knowledge regarding ...

Improved Deterministic Strategy for the Canadian Traveller Problem Exploiting Small Max-(s,t)-Cuts

The k-Canadian Traveller Problem consists in finding the optimal way from a source s to a target t on an undirected weighted graph G, knowing that at most k edges are blocked. The traveller, guided by a strategy, sees an edge is blocked when he visits one of its endpoints. ...

Open loop control theory algorithms for high-speed 3D MEMS optical switches

© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement There is a world-wide push to create the next-generation all-optical transmission and switching technologies for exascale data centers. In this paper we focus on the switching fabrics. Many different types of 2D architectures are ...