Impact of dynamic control format indicator on downlink throughput performance in LTE system

This paper presents an integrated study of dynamic control format indicator impact on downlink throughput in Long Term Evolution (LTE) network based on number of users and configured system bandwidth. CFI (Control Format Indicator) is an indicator notifying number of OFDM symbols used for carrying PDCCH (Physical Downlink Control Channel) ...

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 ...

Partial CSI Acquisition for Size-Constrained Massive MIMO Systems with User Mobility

We propose a low-complexity approach for the downlink of physically-constrained massive multiple-input multiple-output (MIMO) systems with user mobility. We examine a channel state information (CSI) acquisition strategy that exploits both the spatial and temporal correlation among the channels of adjacent base station antennas. The proposed strategy solely collects CSI for ...

On assuring survivability of network operator's services in evolving network environment

At the awakening of the 5G network, efforts of operators and vendors are being put in achieving understandable reliability of services in evolutionary network. The increasing users’ requirements with regard to the received service jointly to the evolving networking environment have introduced many challenges to service reliability. If the network ...

14.5Tb/s Transmission over OM2 Multimode Fiber with Wavelength and Mode Group Multiplexing and Direct Detection

  • Benyahya K.
  • Charlet G.
  • Ghazisaeidi A.
  • Renaudier J.
  • Simonneau C.

We demonstrate 14.5Tb/s bidirectional transmission over 2.2km of OM2 fiber using selective excitation of 4 mode groups, WDM multiplexing and direct detection. 40 wavelengths per mode group are used, each wavelength is modulated with discrete multitone (DMT) scheme with 512 subcarriers. A 88Gs/s digital to analog converter (DAC) is used ...

Probabilistic Eigenvalue Shaping for the Nonlinear Fourier Transform

  • Aref V.
  • Buchberger A.
  • Graell I Amat A.
  • Schmalen L.

We consider an NFT-based system embedding information into the imaginary part of the discrete spectrum. We show that by employing PES we can double the data rate. We validate our findings via Monte-Carlo and SSFM simulation and experimentally.

Interference Reduction in Multi-Cell Massive MIMO Systems with Large-Scale Fading Precoding

  • Ashikhmin A.
  • Li L.
  • Marzetta T.

A wireless massive MIMO system entails a large number (tens or hundreds) of base station antennas serving a much smaller number of users, with large gains in spectral-efficiency and energy-efficiency compared with conventional MIMO technology. Until recently it was believed that in multi-cellular massive MIMO system, even in the asymptotic ...

Performance Analysis of Dense Small Cell Networks with Dynamic TDD

Small cell networks (SCNs) are envisioned to embrace dynamic time division duplexing (TDD) in order to tailor downlink (DL)/uplink (UL) subframe resources to quick variations and burstiness of DL/UL traffic. The study of dynamic TDD is particularly important because it serves as the predecessor of the full duplex transmission technology, ...

SAS-Assisted Coexistence-Aware Dynamic Channel Assignment in CBRS Band

The paradigm of shared spectrum allows secondary devices to opportunistically access spectrum bands underutilized by primary owners. Recently, the FCC has targeted the sharing of the 3.5 GHz (3550-3700 MHz) federal spectrum with commercial systems such as small cells. The rules require a Spectrum Access System (SAS) to accommodate three ...

iTCM: Towards Learning-Based Thermal Comfort Modeling via Pervasive Sensing for Smart Buildings

For decades, ASHRAE Standard 55 has been using the Fanger’s Predicted Mean Vote (PMV) model to evaluate the indoor thermal comfort satisfaction. However, this canonical model has drawbacks in both data inadequacy and lack of inputs from test subjects. In this research, we propose a learning-based solution for thermal comfort ...

Faster Heavy Hitters on Sliding Windows

  • Ben Bassat Ran
  • Einziger G.
  • Waisbard E.

Sliding window measurement is required by network functionalities such as load balancing, traffic engineering and intrusion detection. This work focuses on two fundamental problems -- identifying Heavy Hitters (HH) and Hierarchical Heavy Hitters (HHH) over sliding windows. We introduce two rigorously analyzed algorithms for the HH and HHH problems and ...

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 ...