Designing Optimal Middlebox Recovery Schemes with Performance Guarantees

  • Kanizo Y.
  • Rottenstreich O.
  • Segall I.
  • Yallouz J.

Enabling functionality in modern network is achieved through the use of middleboxes. Middleboxes suffer from temporal unavailability due to various reasons, such as hardware faults. We design a backup scheme that takes advantage of Network Function Virtualization (NFV), an emerging paradigm of implementing network functions in software, deployed on commodity ...

Optimizing Operational Costs of NFV Service Chaining

  • Caggiani Luizelli M.
  • Raz D.
  • Saar Y.

Network Function Virtualization (NFV) is a novel paradigm that enables flexible and scalable implementation of network services on cloud infrastructure. One of the key factors in the success of NFV is the ability to dynamically allocate physical resources according to the actual demand. Yet, orchestrating service chains that require high ...

Error awareness in a multi-layer transport network operating system

Software-defined control based on a network operating system combined with flexible-bitrate optical transponders allows near zero-margin operation of optical networks to ""squeeze"" as much capacity out of a link as possible. Since their inception, optical transport networks have been designed with the assumption that operational optical links must essentially be ...

Rejuvenating direct modulation and direct detection for modern optical communications

  • Che D.
  • Chen X.
  • Hu Q.
  • Li A.
  • Shieh W.

High-speed transoceanic optical fiber transmission using direct modulation (DM) and direct detection (DD) was one of the most stirring breakthroughs for telecommunication in 1990s, which drove the internet as a global phenomenon. However, the later evolution of optical coherent communications in 2000s gradually took over the long-haul applications, due to ...

A fully integrated scalable W-band phased-array module with integrated antennas, self-alignment and self-test

Advanced SiGe BiCMOS and CMOS processes continue to push the frontier on millimeter-wave (mm-wave) and highly integrated phased-array systems for a variety of communication applications [1,3]. Furthermore, next-generation mobile technology (5G) demands ultra-low latency and high data-rates with ubiquitous deployment supporting multi-users through the use of pico-cells. These cells may ...

Physical Layer Security on Fiber-Optic MIMO-SDM Systems: an Overview

  • Cho J.
  • Guan K.
  • Winzer P.

Fiber-optic transmission systems provide large capacities over enormous distance but are vulnerable to simple eavesdropping attacks at the physical layer. We classify key-based and keyless encryption and physical layer security techniques and discuss them in the context of optical multiple-input-multiple-output space-division multiplexed (MIMO-SDM) fiber-optic communication systems. We show that MIMO-SDM ...

Learning process for reducing uncertainties on network parameters and design margins

  • Delezoide C.
  • Pesic J.
  • Pointurier Y.
  • Seve E.

Using monitored physical parameters in a learning process, we decrease design margins by reducing uncertainties on the input parameters of a Quality of Transmission (QoT) tool, improving the accuracy of the signal-to-noise ratio prediction.

A 0.25â€"1.7-GHz, 3.9â€"13.7-mW Power-Scalable, −10-dBm Harmonic Blocker-Tolerant Mixer-First RF-to-Digital Receiver for Massive MIMO Applications

  • Alon E.
  • Lacaille G.
  • Lu P.
  • Narevsky N.
  • Niknejad A.
  • Nikolic B.
  • Puglielli A.
  • Trotskovsky K.
  • Wang Z.
  • Whitcombe A.
  • Wright G.

To be cost-effective and energy-efficient, massive multiple-input multiple-output (MIMO) arrays must be constructed from radio elements with low power and high linearity, but can tolerate higher noise than conventional stand-alone radios. This letter presents a low-power 0.25â€"1.7-GHz power- and resolution-scalable mixer-first receiver tailored for variable-element massive MIMO systems with digital ...

OpenStack installation using Packstack installer

  • Juszczak G.

For several years, cloud computing has been increasingly appearing in the global IT market, both in corporate infrastructure and among private users. In medium and large companies, they replace the current, not very flexible, poorly scalable and often expensive computer infrastructure, and in the case of small businesses, startups and ...

Low profile concentric distributed resonators and filters

  • Bulja S.
  • Doumanis E.
  • Kozlov D.

In this paper we introduce a new family of low-profile and high quality factor distributed resonators, termed concentric distributed resonators. The study of the proposed resonators commences by the investigation of its key parameters, such as frequency of operation, quality factor and maximum electric fields as a function of the ...

Thermal memory effect characterization of GaN based class ABJ power amplifier using intrinsic temperature measurement

Enhancing power efficiency and bandwidth of RF power amplifiers (PAs) is always a challenge for future mobile basestation transceivers. Static and especially dynamic nonlinear effects are mainly responsible for decreasing before mentioned parameters. Static effects can be usually characterized by measuring the PA output with a defined input signal. Fast ...

Scalable Monitoring of End-to-End Delay in Live Video Services

  • Lopez Poncela J.
  • Perez P.
  • Ruiz Alonso J.
  • Villegas A.

In this article, we propose a simple method to monitor the end-to-end live lag in a way which is scalable and meaningful for the service providers. The proposal is based on detecting the wall-clock timestamp of the video frames at capture time and inserting it in-band, so that it is ...

Viability analysis of content preparation configurations to deliver 360VR video via MPEG-DASH technology

We present a viability analysis of a content preparation scheme used to smartly distribute mono-and stereoscopic 360VR video using the MPEG-DASH paradigm. Several configurations in which the portion of the scene that is located at the opposite side of the viewport is set to black have been studied. The main ...

Linear Programming Bounds for Entanglement-Assisted Quantum Error-Correcting Codes by Split Weight Enumerators

  • Ashikhmin A.
  • Lai C.

Linear programming approaches have been applied to derive upper bounds on the size of classical and quantum codes. In this paper, we derive similar results for general quantum codes with entanglement assistance by considering a type of split weight enumerator. After deriving the MacWilliams identities for these enumerators, we are ...

138 Tbit/s Mode- and Wavelength Multiplexed Transmission over 6-Mode Graded-Index Fiber

  • Alvarado-Zacarias J.
  • Alvarez-Aguirre R.
  • Amezcua Correa R.
  • Chen H.
  • Fontaine N.
  • Gruner-Nielsen L.
  • Jensen R.
  • Koonen T.
  • Lingle R.
  • Okonkwo C.
  • Ryf R.
  • Sun Y.
  • Van Weerdenburg J.

We report on the multiplexing of 12 spatial channels and 120 wavelength channels in the C-band, each carrying 16-QAM symbols at 30 Gbaud over graded-index few-mode fiber. A combination of multiple fiber spools with positive and negative modal dispersion values are exploited to form a 59 km link with 0.35 ...

Kramers-Kronig Receivers for 100-km Datacenter Interconnects

  • Antonelli C.
  • Chen X.
  • Mecozzi A.
  • Raybon G.
  • Sethumadhavan C.
  • Shtaif M.
  • Winzer P.

In this paper, we review in detail experimental demonstrations of Kramers-Kronig (KK) based direct detection systems with high per-carrier interface rates, high spectral efficiencies, and ~100-km reach. Two realizations of KK based receivers are demonstrated, including single-polarization and dual-polarization versions. Critical aspects of the KK receiver such as the carrier-to-signal ...

Directly Reflectivity Modulated Laser

  • Brent R.
  • Chen Y.
  • Dong P.
  • Maho A.
  • Melikyan A.

We report a novel directly reflectivity modulated laser (DRML) whose output is modulated through a Michelson interferometer reflector of the laser cavity. 25/40 Gb/s on-off-keying and 25 Gb/s binary phase-shift keying signals are generated and the wavelength tunability is >20 nm.

Massive MIMO has Unlimited Capacity

  • Bjornson E.
  • Hoydis J.
  • Sanguinetti L.

The spectral efficiency (SE) of cellular networks can be improved by the unprecedented array gain and spatial multiplexing offered by Massive MIMO. Since its inception, the coherent interference caused by pilot contamination has been believed to create a finite SE limit, as the number of antennas goes to infinity. In ...

QoS-aware protection in flexgrid optical networks

Elastic optical networks generally rely on protection and restoration mechanisms to prevent the detrimental effect of fiber cuts. In particular, we investigate optical protection in flexgrid optical networks where the symbol rate is varied as a complementary approach to modulation format. We propose a novel protection scenario, whereby premium traffic ...

Modulation over Nonlinear Fourier Spectrum: Continuous and Discrete Spectrum

Nonlinear Frequency Division Multiplexed (NFDM) systems are considered when data is modulated in both parts of the nonlinear Fourier spectrum: continuous spectrum and discrete spectrum. An efficient algorithm is introduced to generate a time-domain signal from a given nonlinear spectrum. The transmission of such NFDM symbols is experimentally demonstrated over ...