Coordinated Multi-Point Massive MIMO Cellular Systems with Sectorized Antennas

Non-cooperative cellular Massive MIMO, combined with max-min power control, is known to give huge improvements in per-user service compared with conventional 4G technology. We investigate further refinements to Massive MIMO, first, in the form of three-fold sectorization, which can be viewed as an e ective reduction in cell size, and ...

5G New Radio: Overview and Performance

The 3GPP New Radio (NR) is a unified, flexible air interface that supports the three main categories for 5G communications as de-fined by the ITU: enhanced mobile broadband, ultra-reliable low-latency communication, and massive internet of things. NR can also support various 5G vertical applications such as those in the automotive ...

H-BLADE: A Bayesian Probabilistic GNSS/LTE-OTDOA Hybrid Localization Algorithm for Harsh Environments

For global navigation satellite systems (GNSS), performance in harsh environments such as urban canyons and indoors can be improved by leveraging cellular localization systems. In this paper, we propose an algorithm, known as the Hybrid Bell Labs Localization Algorithm with channel bias Distribution Estimation (H-BLADE), which fuses measurements from GNSS ...

Performance Evaluation of an Adaptive Self-Organizing Frequency Reuse Approach for OFDMA Downlink

Orthogonal frequency division multiple access (OFDMA) is extensively utilized for the downlink of cellular systems such as long term evolution (LTE) and LTE Advanced (LTE-A). In OFDMA cellular networks, orthogonal resource blocks (RBs) can be used within each cell. However, the available resources are rare and so those resources have ...

Getting type name at compile time

C++ language contains standard __func__ variable which is a string naming the function where it is used. Major vendors offer even more expressive symbols in their compilers (__PRETTY_FUNCTION__ in GCC and clang, __FUNCSIG__ in VC). What is missing, however, is a similar solution to get a type name without using ...

Uplink Pilot Allocation for Multi-Cell Massive MIMO Systems

Pilot contamination due to the pilot reuse in adjacent cells is a very serious problem in massive multi-input multiple-output (MIMO) system. Therefore, the pilot allocation is significant for improving the performance of the system. In this paper, we formulate the pilot allocation optimization problem for maximizing uplink sum rate of ...

Transparent Tx and Rx waveform processing for 5G new radio mobile communications

Several different waveform processing techniques have been studied and proposed for the 5G new radio (NR) physical layer, to support new mixed numerology and asynchronous services. The evaluation and comparison of these different techniques is commonly based on matched waveform processing in the transmitter and receiver units. In this article, ...

Investigating the polarization of an omni-directional patch antenna

The ever-present need for higher data rates in telecom networks has a profound effect on what is required from the ideal antenna. In Ultra Dense Networks (UDN), for example, the challenge is to find an omnidirectional, yet orthogonally polarized, antenna of reasonable size. For this purpose, a new antenna type, ...

Wavelength-stable burst-mode laser for next-generation PONs

We developed a novel wavelength-stable burst-mode (BM) laser based on a multi-electrode distributed-feedback (DFB) laser. Our main use-case for the multi-electrode laser (MEL) is a time- and wavelength-division multiplexed passive optical network (TWDM-PON) (NG-PON2), but the wavelength-stable BM laser might also enable future coherent TDM-PON systems and high-rate PON systems ...

Mining competition in a multi-cryptocurrency ecosystem at the network edge: A congestion game approach

Copyright is held by author/owner(s). We model the competition over several blockchains characterizing multiple cryptocurrencies as a non-cooperative game. Then, we specialize our results to two instances of the general game, showing properties of the Nash equilibrium. In particular, leveraging results about congestion games, we establish the existence of pure ...

Communication Aspects of a Modified Cooperative Adaptive Cruise Control Algorithm

This paper investigates the ability of modified Cooperative Adaptive Cruise Control to support high-density car platooning. We first use a simplistic communication model to study the impact of actuation lag, message periodicity, and communication delay on the minimum feasible inter-car spacing. We then use a detailed IEEE 802.11p simulation model ...

Security Witnesses for Compiler Transformations

Compiler optimizations can be correct and yet be insecure. Program changes made during optimization may weaken security guarantees -- for instance, by introducing new ways to leak secret data. This work presents a methodology for ensuring that security properties are preserved during compilation. Properties are expressed as automata operating over ...

Precoding and Detection for Broadband Single Carrier Terahertz Massive MIMO Systems Using LSQR Algorithm

The terahertz (THz) communication utilizes the frequency spectrum above 300 GHz and is widely considered as a promising solution to the future high-speed shortrange wireless communication beyond millimeter wave (mmWave) communication. While providing tens of gigahertz bandwidth, it is subjected to high propagation path loss, intersymbol and inter-user interferences. The ...

The paradigm-shift of social spambots: Evidence, theories, and tools for the arms race

  • Cresci S.
  • Petrocchi M.
  • Pietro R.
  • Spognardi A.
  • Tesconi M.

© 2017 International World Wide Web Conference Committee (IW3C2), published under Creative Commons CC BY 4.0 License. Recent studies in social media spam and automation provide anecdotal argumentation of the rise of a new generation of spambots, so-called social spambots. Here, for the first time, we extensively study this novel ...

Survey on UAV Cellular Communications: Practical Aspects, Standardization Advancements, Regulation, and Security Challenges

The rapid growth of consumer Unmanned Aerial Vehicles (UAVs) is creating promising new business opportunities for cellular operators. On the one hand, UAVs can be connected to cellular networks as new types of user equipment, therefore generating significant revenues for the operators that guarantee their stringent service requirements. On the ...

400 Gbps Dual-Polarization Non-linear Frequency-Division Multiplexed Transmission with b-Modulation

We demonstrate in simulation a 400 Gbps polarisation-multiplexed 1050x32-QAM NFDM transmission using b-modulation on the continuous nonlinear spectrum. A significant improvement in Q-factor over $q_c$-modulation is observed.

Cache-Aided Interference Channels

Over the past decade, the bulk of wireless traffic has shifted from speech to content. This shift creates the opportunity to cache part of the content in memories closer to the end users, for example in base stations. Most previous paper focuses on the reduction of load in the backhaul ...

Security for 5G and Beyond

The development of the Fifth Generation (5G) wireless networks is gaining momentum to connect almost all aspects of life through the network with much higher speed, very low latency and ubiquitous connectivity. Due to its crucial role in our lives, the network must secure its users, components, and services. The ...

An Overview of the OMAF Standard for 360° Video

Omnidirectional MediA Format (OMAF) is arguably the first virtual reality (VR) system standard, recently developed by the Moving Picture Experts Group (MPEG). OMAF defines a media format that enables omnidirectional media applications, focusing on 360° video, images, and audio, as well as the associated timed text, supporting three degrees of ...

Increasing the Speed of an InP-Based Integration Platform by Introducing High Speed Electroabsorption Modulators

We report high speed electroabsorption modulators (EAMs), designed, fabricated and characterized within an open access generic foundry process. The EAM as a new building block is optimized in the existing platform, in which other BBs are established. By optimizing the EAM design layout, we show a static extinction ratio (static ...