Virtual Massive MIMO Beamforming Gains for 5G User Terminals

  • Amin M.
  • Haardt M.
  • Zirwas W.

For future 5G systems significant performance benefits are expected from massive MIMO, especially in combination with tight inter-cell cooperation including joint-transmission using cooperative multi-point transmission. Most massive MIMO evaluations concentrate on the base station side with the goal to achieve high spectral efficiency by MU-MIMO or large coverage by strong ...

HARQ Enriched Feedback Design for 5G Technology

  • Bakowski K.
  • Khosravirad S.
  • Mudolo L.
  • Pedersen K.

It is well recognized in the literature that the performance of the hybrid automatic repeat request (HARQ) transmission can be improved by adapting the transmission parameters through exploiting extra information from the receiver over the feedback channel. This introduces new degrees of freedom for a more flexible per-link optimized transmission. ...

A New Design and Multiport Performance Evaluation for 3D Massive MIMO System

  • Jin Y.
  • Li N.
  • Li X.
  • Zhang H.
  • Zhong C.

This paper reports a novel design and system performance evaluation of 3D MIMO under LTE-A framework based on 3GPP FD MIMO channel model.We exhibit a creative design of centralized configuration for data processing convenience on BS side considering massive MIMO antenna structure, we also present analysis of three main risks ...

Design of a Wideband and Dual-Polarized CPW-Fed Monopole Antenna for Future 5G Communications

  • Mahe Y.
  • Razban T.
  • Sun H.
  • Yang T.
  • Zhang H.

As fast development in communication field, sub-6 GHz spectrum band becomes ultra crowd. Even though Carrier Aggregation (CA) and higher order modulation used, available spectrum is still the bottleneck of communication speed and network latency. Nowadays, more and more companies and institutes are paying more attention to over 6GHz communication ...

Uplink Contention Based Transmission with Non-Orthogonal Spreading

  • Li H.
  • Miao D.
  • Pedersen K.
  • Sun J.
  • Zhang Y.
  • Zhao Z.

The contention-based (CB) transmission is a promising solution for small data packets transmission in 5G uplink. In this paper, a Non-Orthogonal Coded Access (NOCA) scheme, called ZC-NOCA, is proposed for CB transmission in 5G uplink. For ZC-NOCA, the codes generated by Zadoff-Chu (ZC) sequences is used to spread the data ...

Integrating 3D Channel Model and Grid of Beams for 5G mMIMO System Level Simulations

  • Ganesan R.
  • Panzner B.
  • Pedersen K.
  • Valkealahti K.
  • Zirwas W.

Massive MIMO (mMIMO) antenna array and Grid of Beams (GoB) are one of the key components for 5G to achieve high spectral efficiency and coverage. System level simulations are necessary to optimally intergrate the components of 5G system. Simulations with mMIMO antenna array involve handling large matrices, which results in ...

Enabling RAN Moderation and Dynamic Traffic Steering in 5G

  • Bulakci Ö.
  • Ericson M.
  • Fantini R.
  • Moya F.
  • Prasad A.

The exponential increase in capacity and data rate demands, along with the diversification of use cases and verticals that are planning to use cellular radio access networks (RANs) to provide connectivity, has prompted the development of the fifth generation (5G) of radio access technology. Traffic steering, which aims at optimum ...

Coverage and Capacity Analysis of LTE-M and NB-IoT in a Rural Area

  • Holst S.
  • Kovacs I.
  • Lauridsen M.
  • Mogensen P.
  • Sorensen M.

The 3GPP has introduced the LTE-M and NB-IoT User Equipment categories and made amendments to LTE release 13 to support the cellular Internet of Things. The contribution of this paper is to analyze the coverage probability, the number of supported devices, and the device battery life in networks equipped with ...

A Simple Statistical Signal Loss Model for Deep Underground Garage

  • Gimenez L.
  • Kovacs I.
  • Mogensen P.
  • Nguyen H.
  • Rodriguez I.
  • Sorensen T.

In this paper we address the channel modeling aspects for a deep-indoor scenario with extreme coverage conditions in terms of signal losses, namely underground garage areas. We provide an in- depth analysis with regard to the path loss (gain) and large-scale signal shadow fading, and propose a simple propagation model ...

Optical filter requirements in an EML-based single-sideband PAM4 intensity-modulation and direct-detection transmission system

  • Chen J.
  • Chen H.
  • Chen Y.
  • Kaneda N.
  • Lee S.

The feasibility of a single sideband (SSB) PAM4 intensity-modulation and direct-detection (IM/DD) transmission based on a CMOS ADC and DAC is experimentally demonstrated in this work. To cost effectively build a >50 Gb/s system as well as to extend the transmission distance, a low cost EML and a passive optical ...

Diversity Trade-Offs and Joint Coding Schemes for Highly Reliable Wireless Transmissions

  • Awada A.
  • Fettweis G.
  • Ohmann D.
  • Simsek M.
  • Viering I.

High reliability and low latency are key requirements for a number of upcoming use cases and applications in mobile communication networks. In order to address the requirements, we present statistical models which capture the most important radio propagation phenomena, such as path loss, shadowing, and small scale fading. The models ...

High Speed Electronics

  • Chen Y.

Short course at OFC 2017 on High Speed Electronics

Athermal operation of a multi-section laser

  • Bello F.
  • Donegan J.
  • Enright R.
  • O'Reilly Meehan R.
  • Wallace M.

Two distinct athermal bias current control procedures are demonstrated for a low-cost, monotlithic, three section slotted single mode laser, achieving wavelength stability of ±0.01 nm over a temperature range of 10-85C. This is the first time that athermal performance has been demonstrated for a three-section slotted laser with simple fabrication, ...

Can Metro Networks Be the Next Playground for (True) Elastic Optical Networks

  • Bigo S.
  • Dupas A.
  • Layec P.
  • Verchere D.

Metro networks, being at the meeting point between telecom operators and over-the-top service providers, are particularly well-suited to the introduction of some level of dynamics in the optical networks, leveraging elastic building blocks such as transponders and optical nodes. We review some metro networks challenges appealing for innovative solutions in ...

Recent Progress on Standardization of Next Generation 25, 50 and 100G EPON

  • Harstead E.
  • Houtsma V.
  • Van Veen D.

In this paper an overview is given on the recent developments in next generation high speed PON. A summary is presented on the progress being made by the IEEE P802.3ca task force on the standardization of 25, 50 and 100G EPON. An outline of the physical layer specification for next ...

Optical Ethernet - Flexible Optical Metro Networks

  • Benzaoui N.
  • Buchali F.
  • Dembeck L.
  • Dischler R.
  • Franz B.
  • Gebhard U.
  • Lautenschlaeger W.
  • Leven A.
  • Milbrandt J.
  • Pointurier Y.
  • Roesener D.
  • Schmalen L.

Enhanced flexibility in optical transport networks is a key requirement to support dynamic traffic load in packet based networks. Today, flexibility is reached by packet switches connected by static point-to-point transport connections. Wide-stretched synchronization patterns, line coding schemes, and Forward Error Correction frames (FEC) prohibit flexibility right in the transport. ...

Proposals for Cost-Effectively Upgrading Passive Optical Networks to a 25G Line Rate

  • Houtsma V.
  • Van Veen D.

Bandwidth demands keep increasing, inspiring researchers to continue to find cost-effective ways to increase the line rate in PON systems. In this paper we present and discuss proposals to upgrade 10G PONs with a 25 Gbps line rate at low cost and with low power consumption. Our proposals are based ...

Hybrid integrated wavelength and reflectivity tunable III-V/Silicon transmitter

  • Bolle C.
  • Brenot R.
  • Chang C.
  • Chen Y.
  • De Valicourt G.
  • Dong P.
  • Earnshaw M.
  • Eggleston M.
  • Kaneda N.
  • Maho A.
  • Melikyan A.

We demonstrate a novel wavelength-tunable hybrid silicon-based transmitter with integrated reflectivity tunable mirror. First, designs of a novel hybrid laser based on reflective symmetric and asymmetric Mach-Zehnder interferometer based mirrors are studied with single and double ring intra-cavity filters respectively. Asymmetric configuration is used in order to increase the tuning ...

Computational Study of the Noise Radiation in a Centrifugal Pump with Varying Flow Rate

  • Lei S.

In this paper, a three-dimensional unsteady hydro/aero acoustic model with Large Eddy Simulation (LES) closure is developed to explore noise radiation patterns in a centrifugal pump at different flow rates. Specifically, the Ffowcs Williams-Hawkings model (FW-H) is employed to predict noise generation by the blades as well as the volute. ...

Analysis and Diagnosis of SLA Violations in a Production SaaS Cloud

  • Ganesan R.
  • Iyer R.
  • Kalbarczyk Z.
  • Martino C.
  • Sarkar S.

A software-as-a-service (SaaS) needs to provide its intended service as per its stated service-level agreements (SLAs). While SLA violations in a SaaS platform have been reported, not much work has been done to empirically characterize failures of SaaS. In this paper, we study SLA violations of a production SaaS platform, ...