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 ...

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 ...

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 ...

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 ...

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 ...

A Radio Resource-Efficient Paging Method in High Frequency 5G Networks

  • Awada A.
  • Michalopoulos D.

Conventional paging methods are associated with increased radio resource overhead when deployed in high frequency networks. This is due to the beam sweeping involved, which, particularly for large number of beams, renders conventional paging inefficient. This work provides an assessment in terms of radio resource usage efficiency of an alternative ...

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. ...

Machine-Learning Identification of Airborne UAV-UEs Based on LTE Radio Measurements

  • Amorim R.
  • Kovacs I.
  • Mogensen P.
  • Nguyen H.
  • Wigard J.

The overall cellular network performance can be optimized for both ground and aerial users, if different treatment is given for the two user classes. Airborne UAVs experience different radio conditions that terrestrial users due to clearance in the radio path, which leads to strong desired signal reception, but at the ...

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, ...

Ultra-Dense Networks: A New Look at the Proportional Fair Scheduler

  • Amir H. Jafari
  • Guoqiang Mao
  • Lopez-Perez D.
  • Ming Ding
  • Zihuai Lin

In this paper, we theoretically study the proportional fair (PF) scheduler in the context of ultra-dense networks (UDNs). Analytical results are obtained for the coverage probability and the area spectral efficiency (ASE) performance of dense small cell networks (SCNs) with the PF scheduler employed at base stations (BSs). For the ...

Towards a cognitive warning system for safer hybrid traffic

  • Csépe V.
  • Honbolygó F.
  • Mallet P.
  • Mestre D.
  • Pergandi J.
  • Török Á.
  • Varga K.

Technological development brings increasingly closer the era of widely available self-driving cars. However, presumably there will be a time where human drivers and self-driving cars would share the same roads. In the current paper, we propose a cognitive warning system that utilizes information collected from the behaviour of the human ...

Scaling Deep Learning-based Decoding of Polar Codes via Partitioning

  • Cammerer S.
  • Gruber T.
  • Hoydis J.
  • Ten Brink S.

The training complexity of deep learning-based channel decoders scales exponentially with the codebook size and therefore with the number of information bits. Thus, neural network decoding (NND) is currently only feasible for very short block lengths. In this work, we show that the conventional iterative decoding algorithm for polar codes ...

Dynamic TDD: the Asynchronous Case and the Synchronous Case

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

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, ...

Efficiency of Cloud-Based Application Services

  • Bauer E.

This theoretical work deeply analyzes operational and economic efficiency of producing services for end users from applications executing on cloud computing platforms. Operational efficiency is factored into service production efficiency, capacity utilization efficiency and VNF efficiency. A dynamic, time-driven, activity-based cost model of service production is derived. Six efficiency improvement ...

Agent composition for 5G management and orchestration

  • Raisanen V.

Virtualized execution environments in 5G network call for a linkage between network management and orchestration. Execution of 3GPP functionalities and management applications in the cloud also presents an opportunity to innovate outside of traditional paradigms. We describe a framework focusing on a virtual execution environment and utilizing agent composition to ...

Connectivity extraction in cloud infrastructures

  • Dubus S.
  • Kanoun W.
  • Mensah P.
  • Morin C.
  • Piolle G.
  • Totel E.

For management and security purposes, cloud providers should know the connectivity graph between virtual machines. Since traditional methods used in physical networks produce incomplete results and are hardly usable in the Cloud, we propose to use information provided by a Cloud Management Software and an SDN controller, to compute the ...

Impact of timing mismatch in multicarrier spectral-slicing transmission system using single coherent receiver

  • Le S.
  • Nguyen D.
  • Nguyen H.
  • Nguyen T.
  • Truong D.

Summary form only given. Strong light-matter coupling has been recently successfully explored in the GHz and THz [1] range with on-chip platforms. New and intriguing quantum optical phenomena have been predicted in the ultrastrong coupling regime [2], when the coupling strength Ω becomes comparable to the unperturbed frequency of the ...