We study the betweenness centrality (BC) of vertices of a graph using random walk paths. Random walk BC (RWBC) provides an alternative measure to the shortest path centrality of each vertex in a graph as it aggregates contributions from possibly all vertex-pairs in the graph and not just from those ...
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 ...
How 64 GBaud optical carriers maximize the capacity in core elastic WDM networks with fewer transponders per Gb/s
Following the extensive investigations of the research community throughout the last 5 years regarding the transmission performance when roughly doubling the channel symbol rate in WDM systems from generic 32 GBaud to more than 60 GBaud, this evolution is about to become a reality in the field by the next ...
This paper proposes a pilot subcarrier allocation approach for OFDM waveforms, which enables construction of phase-noise estimate with high efficiency and low overhead in non-iterative manner. The complexity and the performance of the overall phase-noise suppression algorithm together with the proposed pilot allocation approach are evaluated against a reference algorithm. ...
Licensee MDPI, Basel, Switzerland. This paper demonstrates a high-speed, low-noise dynamic comparator, employing self-calibration. The proposed dual-sided, fully-dynamic offset calibration is able to reduce the input-referred offset voltage by a factor of ten compared to the uncalibrated value without any speed or noise penalty and with less than 5% power ...
At the end of my 6-year tenure as the Editor-in-Chief of the IEEE/OSA Journal of lightwave technology, I would like to take the opportunity to not only reflect on this very special journal that has served our photonics community for the past 35 years, but more generally on the state ...
- Angelakis V.
- Ephremides A.
- Fountoulakis E.
- Liao Q.
- Pappas N.
Wireless devices need to adapt their transmission power according to the fluctuating wireless channel in order to meet constraints of delay sensitive applications. In this paper, we consider delay sensitivity in the form of strict deadlines on packet arriving in a transmission queue. Packets missing the deadline while in the ...
- Fischer T.
- Gao J.
- Knode J.
- Liao Q.
- Naseer F.
- Oechsner C.
To properly determine the severity of an emergency and provide a quick response, information has to be gathered, confirmed, and analyzed. Artificial intelligence assisted UAV can provide a unique perspective and review extensive information for an incident. However, their limited computing capacity and battery duration raise the challenge to compute-intensive ...
Network slicing is one of the main novelty of 5G systems and it is expected to radically change the approach of network operators to the support of vertical applications managed by tenants with specific and stringent performance requirements. Static allocation of resources to slices is a straightforward approach to meet ...
In this paper, we study the performance of ultrareliable low latency communication (URLLC) for cellular standalone systems in unlicensed bands. Our focus is on the 5 GHz band, adopting a system model in coherence with the MulteFire standard, which essentially is a variant of LTE (Long Term Evolution) for unlicensed ...
Through this paper, the performance of uplink transmissions in terms of latency and reliability in unlicensed spectrum is addressed. Our goal is to provide insights into how ultra-reliable and low latency communications behave over the unlicensed spectrum in standalone mode. Our system model is based on the MulteFire radio access ...
In this work, we analyze the throughput of random access multi-user relay-assisted millimeter-wave wireless networks, in which both the destination and the relay have multipacket reception capability. We consider a full-duplex network cooperative relay, which stores the successfully received packets in a queue, whose performance are analyzed. Moreover, we study ...
Spatial and Temporal Channel Characteristics of 5G 3D Channel Model with Beamforming for User Mobility Investigations
High carrier frequencies are an integral part of the upcoming fifth generation (5G) mobile networks as they offer high data rates and increase the quality of experience. To compensate for the high path loss at high carrier frequencies, beamforming is applied resulting in users connecting and switching between beams of ...
- Alvarado-Zacarias J.
- Amezcua Correa R.
- Antonio Lopez J.
- Antonio-López J.
- Chen H.
- Fontaine N.
- Hernández-Cordero J.
- Leon-Saval S.
- Okonkwo C.
- Ryf R.
- Sillard P.
- Velazquez Benitez A.
We present a new technique allowing the fabrication of large modal count photonic lanterns for space division multiplexing applications. We demonstrate mode-selective photonic lanterns supporting 10 and 15 spatial channels by using graded index fibres and microstructured templates. These templates are a versatile approach to position the graded index fibres ...
- Andrekson P.
- Astra E.
- Eliasson H.
- Karlsson M.
- Olsson S.
The capacity and reach of long-haul fiber optical communication systems is limited by in-line amplifier noise and fiber nonlinearities. Phase-sensitive amplifiers add 6 dB less noise than conventional phase-insensitive amplifiers, such as erbium-doped fiber amplifiers, and they can provide nonlinearity mitigation after each span. Realizing a long-haul transmission link with ...
- Capra L.
- Greatorex A.
- Musolesi M.
- Quattrone G.
- Quercia D.
In the hospitality industry, the room and apartment sharing platform of Airbnb has been accused of unfair competition. Detractors have pointed out the chronic lack of proper legislation. Unfortunately, there is little quantitative evidence about Airbnb?s spatial penetration upon which to base such a legislation. In this study, we analyze ...
- Dembeck L.
- Gebhard U.
- Lautenschlaeger W.
Low latency requirements are driving the data center business into the metro area, the so-called Edge Cloud. We investigate the new networking requirements and how they can be served by our Optical Ethernet framework. We elaborate, why the Edge Cloud requires true packet switching in the metro network instead of ...
The current telecommunications business is characterized by fierce competition between Multi System Operators (MSOs) and Communication Service Providers (CSPs) (both called "CSP" in the rest of this paper), flat revenues, and rising network demands and stressing costs. A high percentage of cost is in network OPEX can be attributed to ...
- Chao H.
- Chen K.
- Guo Z.
- Gushchin A.
- Liu R.
- Walid A.
- Xu Y.
Software-Defined Networking (SDN) employs a centralized control with a global network view and provides great opportunities to improve network performance. However, due to the limitation of flow-table space at the switches and unbalanced traffic allocation on links, an SDN may suffer from flow-table overflow and inefficient bandwidth allocation among flows, ...
Erratum to: Long-haul optical transmission link using low-noise phase-sensitive amplifiers (Nature Communications, (2018), 9, 1, (2513), 10.1038/s41467-018-04956-5)
- Andrekson P.
- Astra E.
- Eliasson H.
- Karlsson M.
- Olsson S.
The original version of this Article incorrectly listed an affiliation of Samuel L.I. Olsson as ?Thomas Johann Seebeck Department of Electronics, Tallinn University of Technology, Tallinn 19086, Estonia?, instead of the correct ?Present address: Nokia Bell Labs, 791 Holmdel Road, Holmdel, NJ 07733, USA?. Similarly, Egon Astra had an incorrect ...