Deadline Constrained Traffic Handling under Average Power Constraints

  • Angelakis V.
  • Ephremides A.
  • Fountoulakis E.
  • Liao Q.
  • Pappas N.

Wireless devices need to adapt their transmission power according to the fluctuating wireless channel in order to meet constraints of delay sensitive applications. In this paper, we consider delay sensitivity in the form of strict deadlines on packet arriving in a transmission queue. Packets missing the deadline while in the ...

A Secure End-to-End Cloud Computing Solution for Emergency Management via UAVs

  • Fischer T.
  • Gao J.
  • Knode J.
  • Liao Q.
  • Naseer F.
  • Oechsner C.

To properly determine the severity of an emergency and provide a quick response, information has to be gathered, confirmed, and analyzed. Artificial intelligence assisted UAV can provide a unique perspective and review extensive information for an incident. However, their limited computing capacity and battery duration raise the challenge to compute-intensive ...

Long-haul optical transmission link using low-noise phase-sensitive amplifiers

  • Andrekson P.
  • Astra E.
  • Eliasson H.
  • Karlsson M.
  • Olsson S.

The capacity and reach of long-haul fiber optical communication systems is limited by in-line amplifier noise and fiber nonlinearities. Phase-sensitive amplifiers add 6 dB less noise than conventional phase-insensitive amplifiers, such as erbium-doped fiber amplifiers, and they can provide nonlinearity mitigation after each span. Realizing a long-haul transmission link with ...

Analyzing and predicting the spatial penetration of Airbnb in U.S. cities

  • Capra L.
  • Greatorex A.
  • Musolesi M.
  • Quattrone G.
  • Quercia D.

In the hospitality industry, the room and apartment sharing platform of Airbnb has been accused of unfair competition. Detractors have pointed out the chronic lack of proper legislation. Unfortunately, there is little quantitative evidence about Airbnb?s spatial penetration upon which to base such a legislation. In this study, we analyze ...

Scaling photonic lanterns for space-division multiplexing

  • Alvarado-Zacarias J.
  • Amezcua Correa R.
  • Antonio Lopez J.
  • Antonio-López J.
  • Chen H.
  • Fontaine N.
  • Hernández-Cordero J.
  • Leon-Saval S.
  • Okonkwo C.
  • Ryf R.
  • Sillard P.
  • Velazquez Benitez A.

We present a new technique allowing the fabrication of large modal count photonic lanterns for space division multiplexing applications. We demonstrate mode-selective photonic lanterns supporting 10 and 15 spatial channels by using graded index fibres and microstructured templates. These templates are a versatile approach to position the graded index fibres ...

Design and measurement of a 5G mmW mobile backhaul transceiver at 28 GHz

  • Destino G.
  • Korvala A.
  • Kursu O.
  • Leinonen M.
  • Pärssinen A.
  • Pettissalo M.
  • Rahkonen T.
  • Sonkki M.
  • Tammelin S.
  • Tervo N.

High throughput and ultra low latency are the main requirements for fifth generation (5G) mobile broadband communications. Densely populated urban environments require utilization of previously underutilized millimeter wave frequency spectrum for higher data rates. The Ka-band, previously used in satellite applications, is of particular interest to terrestrial 5G mobile networks. ...

Fast Approximation Algorithms for p-Centers in Large ? -Hyperbolic Graphs

  • Edwards K.
  • Kennedy W.
  • Saniee I.

© 2018, Springer Science+Business Media, LLC, part of Springer Nature. We provide a quasilinear time algorithm for the p-center problem with an additive error less than or equal to 3 times the input graph?s hyperbolic constant. Specifically, for the graph G= (V, E) with n vertices, m edges and hyperbolic ...

Balancing flow table occupancy and link utilization in software-defined networks

  • Chao H.
  • Chen K.
  • Guo Z.
  • Gushchin A.
  • Liu R.
  • Walid A.
  • Xu Y.

Software-Defined Networking (SDN) employs a centralized control with a global network view and provides great opportunities to improve network performance. However, due to the limitation of flow-table space at the switches and unbalanced traffic allocation on links, an SDN may suffer from flow-table overflow and inefficient bandwidth allocation among flows, ...

Erratum to: Long-haul optical transmission link using low-noise phase-sensitive amplifiers (Nature Communications, (2018), 9, 1, (2513), 10.1038/s41467-018-04956-5)

  • Andrekson P.
  • Astra E.
  • Eliasson H.
  • Karlsson M.
  • Olsson S.

The original version of this Article incorrectly listed an affiliation of Samuel L.I. Olsson as ?Thomas Johann Seebeck Department of Electronics, Tallinn University of Technology, Tallinn 19086, Estonia?, instead of the correct ?Present address: Nokia Bell Labs, 791 Holmdel Road, Holmdel, NJ 07733, USA?. Similarly, Egon Astra had an incorrect ...

Self-Healing and Resilience in Future 5G Cognitive Autonomous Networks

In the Self-Organizing Networks (SON) concept, self-healing functions are used to detect, diagnose and recover degraded states in the managed Network Functions (NFs) or other resources. Such methods are increasingly important in future network deployments, since ultra-high reliability is one of the key requirements for the future 5G networks, for ...

Time brings all things to pass

When testing asynchronous and parallel software one can run into different race conditions. One can experience races between different parts of system or races between test environment and system under test. When wombined with arbitrary timeouts used extensively in the system complexity becomes hard to harness. Imperfect solutions include waiting ...

Silicon Photonics Enabled Hyper-Wideband RF Receiver With >85% Instantaneous Bandwidth

We demonstrate the first-ever silicon photonics enabled hyper-wideband RF spread-spectrum link. A hybrid III/V-silicon photonic mode-locked laser encoded with a four-channel silicon photonic phase encoder is used to generate optical carriers that coherently demodulate a received RF signal spanning an instantaneous bandwidth greater than 85% of the center frequency (12/14 ...

Delta probing policies for redundancy

We consider job dispatching in systems with N parallel servers. In redundancy-d policies, replicas of an arriving job are assigned to d?N servers selected uniformly at random (without replacement) with the objective to reduce the delay. We introduce a quite general workload model, in which job sizes have some probability ...

Adaptive Step-size Iterative Algorithm for Sparse Signal Recovery

  • Yuan X.

We develop the variational Bayesian plus Euclidean projection (VB-EP) algorithm for sparse signal recovery from compressed measurements. This algorithm is formulated as an iteratively alternating projection strategy. The first step projects the measurements/residuals to the signal level, which is implemented via a Bayesian model; the second step projects the results ...

User level performance analysis of multi-hop in-band backhaul for 5G

  • Drozdy A.
  • Kapanen J.
  • Manner J.

In recent years, mobile access networks operating at millimeter wavelengths have received a great deal of attention, as they promise previously unattainably high mobile data rates. At these frequencies, mobile access links are expected to use highly directional beamforming antennas, which are also well suited to backhaul links. Therefore, access ...

Energy Saving via Efficient Allocation of Paging Frames

  • Awada A.
  • Michalopoulos D.

We propose an alternative design for paging in next generation networks, and investigate its potential for increasing the energy efficiency of base stations. The proposed design allocates the paging frames in certain radio frames, aiming at providing longer sleep opportunities to the base stations. This allows more hardware components to ...

Slow Food, Slow Code

  • Latuszek G.

Have you met term slow-food?. Look at https://en.wikipedia.org/wiki/Slow_Food. It came to life as reaction for fast-food. Its manifesto is "everyone has the right to good, clean and fair food" (Carlo Petrini - Slow Food Founder & President). How it maps to software engineering, especially test automation? I'm sure you have ...

Non-convex weighted ?<inf>p</inf>nuclear norm based ADMM framework for image restoration

  • Liu X.
  • Tang L.
  • Wang Q.
  • Wu Y.
  • Yuan X.
  • Zha Z.
  • Zhang X.

© 2018 Inspired by the fact that the matrix formed by nonlocal similar patches in a natural image is of low rank, the nuclear norm minimization (NNM) has been widely used in various image processing studies. Nonetheless, nuclear norm based convex surrogate of the rank function usually over-shrinks the rank ...

ApproxJoin: Approximate Distributed Multi-way Joins

  • Akkus I.
  • Bhatotia P.
  • Blanas S.
  • Chen R.
  • Fetzer C.
  • Le Quoc D.
  • Strufe T.

The join operation is a fundamental building block of parallel data processing. Unfortunately, it is very resource-intensive to compute an equi-join across massive datasets. The approximate computing paradigm allows users to trade accuracy and latency for expensive data processing operations. The equi-join operator is thus a natural candidate for optimization ...

Integrated lithium niobate electro-optic modulators operating at CMOS-compatible voltages

  • Bertrand M.
  • Chandrasekhar S.
  • Chen X.
  • Lon?Ar M.
  • Shams-Ansari A.
  • Wang C.
  • Winzer P.
  • Zhang M.

Electro-optic modulators translate high-speed electronic signals into the optical domain and are critical components in modern telecommunication networks1,2and microwave-photonic systems3,4. They are also expected to be building blocks for emerging applications such as quantum photonics5,6and non-reciprocal optics7,8. All of these applications require chip-scale electro-optic modulators that operate at voltages compatible ...