Modeling of radio link budget with beamforming antennas for evaluation of 5G systems

Development of next generation mobile communication system (5G) is progressing rapidly. Standardization and regulatory bodies like 3rdGeneration Partnership Project (3GPP) or International Telecommunication Union (ITU) are working on definition of requirements which will enable global usage of 5G and ensure sufficient co-existence with previous generations of mobile communication systems like ...

Integrated Hybrid Wavelength-tunable III-V/Silicon transmitter based on ring-assisted Mach-Zehnder interferometer modulator

  • Brenot R.
  • De Valicourt G.
  • Dong P.
  • Eggleston M.
  • Kim K.
  • Lee S.
  • Zhu C.

We demonstrate a wavelength-tunable hybrid III-V/Si transmitter based on a Vernier laser with more than 30 nm tuning range and two microring modulators nested in a Mach-Zehnder interferometer. This transmitter circuit has versatile operating modes. It can be used for OOK generation based on low drive voltage push-pull ring modulators ...

Optimization of code lines and time of access to information through object-relational mapping (ORM) using alternative tools of connection to database management systems (DBMS)

The present article presents a comparison between technologies used in the development of C# language systems for access to information in database management systems. The method used has been the classic for the input of information with some steps of data persistence to perform the modeling of information with the ...

5G RAN optimizations through radio shared data layer (RSDL)

This paper presents the challenges that are currently faced during X2/Xn handovers. Messages are exchanged between source and target eNBs over X2/Xn interface during handovers. This mechanism is quite inefficient due to messaging overheads, timers, retries and failures like message validation and resource unavailability. The paper proposes optimizations in the ...

Field experimental evaluation of higher rank MIMO in quad-directional UE antenna configuration for 5G radio access system

This paper presents field experiments on the downlink performance of a 5G radio access system employing higher rank MIMO in the quad-directional antenna configuration at UE side comparing the uni-directional antenna configuration in typical small cell environments. Each antenna branch of the quad-directional antenna directs for intervals of 90 degrees ...

An RNS-Based Forwarding Approach To Implement SFC

  • Hu Z.
  • Zhao M.

Because of the more and more diversified service, SFC needs to be dynamically and feasibly implemented. Thanks to NFV and SDN ideas, the new SFC architecture is defined to meet the requirements in the IETF. Based on the OpenFlow, the approach of the single flow table is used to implement ...

Virtual reality experience as a stress recovery solution in workplace

This paper reports a study exploring the possibilities of virtual reality (VR) and head mounted display as a stress recovery solution for workplace. Commercially available low-cost head mounted display (HMD) was used for presenting three different 360° videos of nature scenes, -sounds and calm music. Six experiment sessions were arranged ...

Low-Profile Miniaturized Coaxial Cavity Resonators and Filters

  • Bulja S.
  • Dmitry Kozlov
  • Doumanis E.

A new class of coaxial cavity filters with low-profile is proposed. The additional benefits of the technology include: volume reduction, high performance, and superior spurious free-response. The proposed resonator consists of a cavity enclosure and three metallic conductors; an outer hollow cylinder, an inner hollow cylinder protruding the cavity from ...

Typhoon: An SDN Enhanced Real-Time Big Data Streaming Framework

  • Chang H.
  • Cho J.
  • Lakshman T.
  • Mukherjee S.
  • Van Der Merwe J.

Current big data streaming frameworks focus mainly on the scalability of real-time stream data processing, and are not flexible, controllable, and programmable enough to accomodate dynamic streaming application needs. For example, current frameworks do not deal well with use cases like updating routing and computation logic, or enabling live debugging ...

Simple optoelectronic frequency-offset estimator for coherent optical OFDM

  • Corcoran B.
  • Jignesh J.
  • Lowery A.
  • Zhu C.

We propose a carrier frequency-offset estimator for optical OFDM systems using off-the-shelf optical components and simple digital processing as a replacement for the purely digital signal processing using the cyclostationarity property of optical OFDM signals with cyclic prefix. Simulations show the system accuracy of < 4% estimate error within the ...

Optimal Control of Storage Regeneration with Repair Codes

  • De Pellegrini F.
  • El-Azouzi R.
  • Hassani O.
  • Silva A.

High availability of containerized applications requires to perform robust storage of applications' state. Since basic replication techniques are extremely costly at scale, storage space requirements can be reduced by means of erasure and/or repairing codes. In this paper we address storage regeneration using repair codes, which is a robust distributed ...

Service-aware Network Slice Trading in a Shared Multi-tenant Infrastructure

  • Akgul O.
  • Capone A.
  • Malanchini I.
  • Suryaprakash V.

Maintaining service guarantees in a dynamic multi-tenant network, while ensuring an economically sustainable sharing platform, is a non-trivial problem. This paper, extending on our previous work, develops a dynamic slicing and trading framework that can satisfy a variety of service guarantees. This framework not only determines the size of the ...

Coverage and Capacity Impact of Mobility and Human Body Blocking at Millimeter Waves

  • Kaya A.
  • Viswanathan H.

We investigate the impact human body blocking on the performance of millimeter wave wireless systems in an urban hotspot scenario. The effects of human body blocking at higher frequency bands are expected to be more severe than at traditional cellular bands because of worse signal propagation through the human body. ...

System-Level Performance Evaluation for 5G mmWave Cellular Network

  • Gacanin H.
  • Jonathan Rodriguez
  • Kazi M. S. Huq
  • Shahid Mumtaz
  • Sherif A. Busari

Cellular networks with hyper-dense deployment of small cells have been identified as the performance-optimizing architecture for fifth-generation (5G) mobile systems. A thousandfold capacity increase is projected when such networks benefit from aggressive spatial multiplexing and huge bandwidth, realizable with massive antenna arrays and millimeter-wave (mmWave) spectrum, respectively. As a precursor ...

Robust Regularised Channel Inversion for Massive MIMO Unlicensed

  • Ding M.
  • Garcia Rodriguez A.
  • Geraci G.
  • Qiang H.
  • Yuan J.

In this paper, we propose a robust regularised channel inversion (RRCI) approach to improve the downlink performance of massive multiple-input multiple-output unlicensed (mMIMO-U) under imperfect channel state information (CSI). We first derive the optimal parameter $alpha$ for regularised channel inversion (RCI). We then compare the beamforming performance among our proposed ...

LTE-M Evolution Towards 5G Massive MTC

  • Bhatoolaul D.
  • Ghosh A.
  • Mangalvedhe N.
  • Ratasuk R.

Massive machine type communication (mMTC) has been identified as an important use case for 5G New Radio wireless technology. In 4G Long-Term Evolution (LTE), 3GPP has previously introduced LTE-M for low-power, wide-area networks supporting the Internet of Things. Rel-13 specifications for LTE-M were completed in 2016. Rel-14 enhancements were completed ...

Massive MIMO Unlicensed for High-Performance Indoor Networks

  • Claussen H.
  • Ding M.
  • Garcia-Rodriguez A.
  • Geraci G.
  • Giordano L.
  • Lopez-Perez D.

We propose massive MIMO unlicensed (mMIMO-U) as a high-capacity solution for future indoor wireless networks operating in the unlicensed spectrum. Building upon massive MIMO (mMIMO), mMIMO-U incorporates additional key features, such as the capability of placing accurate radiation nulls towards coexisting nodes during the channel access and data transmission phases. ...

Multigroup Multicast Precoding in Massive MIMO

Optimal physical layer multicasting (PLM) is an NP-hard problem that for simplicity has been studied under idealistic assumptions, e.g., availability of perfect channel state information (CSI), both at the base station (BS) and at the user terminals (UTs). With the advent of massive multiple-input-multiple-output (MIMO), PLM has become more challenging, ...

What is the Optimal Network Deployment for a Fixed Density of Antennas?

  • Guoqiang Mao
  • Lopez-Perez D.
  • Ming Ding
  • Xuefeng Yao
  • Zihuai Lin

In this paper, we answer a fundamental question: when the total number of antennas per square kilometer is fixed, what is the optimal network deployment? A denser network with a less number of antennas per base station (BS) or the opposite case. To evaluate network performance, we consider a practical ...