The fifth generation (5G) of mobile radio technologies has been defined as a new delivery model where services are tailored to specific vertical industries. 5G supports three types with different and heterogeneous requirements, i.e. enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC) massive Machine-Type (mMTC). These directly related exemplary verticals such media, vehicular communications or the Industry 4.0. This work provides detailed analysis performance...

Cellular networks assisted by flexibly placed high-maneuverability unmanned aerial vehicles (UAVs) have attracted virtual interests recently. In this paper, the utility maximization problem is investigated to determine how improve performance of multi-UAV enabled software-defined cellular (SDCNs) with wireless backhaul. The formulated jointly optimizes three dimensional (3D) UAV placement, user scheduling and association, spectrum resource allocation. proposed intractable since it a...

A survey of multi-resonant antennas is comprehensively presented, with emphasis on theoretical framework, design approaches, and practical examples. This article begins a brief history the dipole theory, then concentrates approaches that have been developed to typical, basic antenna elements, for example, electric antenna, slotline loop complementary microstrip patch antenna. Design examples different applications are raised. In final, approach summarized compared some relevant techniques.

A design approach to miniaturized, dual-resonant microstrip circular sector patch antenna with tilted circularly polarized (CP) beam is proposed. As mathematically laid down at first, the range of an asymmetric multiresonant prototype dipole's length should be set as positive odd-integer multiples one-quarter wavelength, such that resonant frequency could accordingly reduced by one-half symmetric case. In this way, radiator can then employed realize a unique CP simultaneously exciting two...

In this article, a novel design approach to triple-resonant, circular sector patch antenna with wideband null frequency scanning functionality is advanced. At first, the operation principle of revealed by simplest, straight electric dipole under multiple resonances. Then, triple-resonant designed based on double-wavelength prototype magnetic synthesizing it usable resonant modes. As synthesized, TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

The explosive growth of mobile data traffic and the scarcity available licensed spectrum make resource allocation in heterogeneous networks a critical issue. A distributed algorithm for software defined cellular future 5G is proposed. adoption integrated femto-WiFi small cells used to alleviate shortage, by permitting simultaneous access both bands (via interface) unlicensed WiFi interface). weighted utility maximization problem formulated optimize allocation, utilizing network controller’s...

Low-power devices have manifested their crucial roles in manifold green Internet of Things (IoT) applications, including healthcare, smart home, industrial sensors, and wearable apparatuses. However, to prolong the operation time these devices, significantly enhancing battery capacity turns out be an intractable challenge due mandatory constraint limited form factors. Achieving this goal thus inevitably relies on new designs physical-layer (PHY)and medium access control (MAC) schemes. This...

In this article, a novel design approach to wide beamwidth dual-resonant, wideband sectorial dipole antennas is advanced. At first, 1-D, full-wavelength evolved into 2-D, dipole, so as determine its two usable resonant modes. Then, both and characteristics are simultaneously attained under dual-mode resonance. Next, dual-resonant with flared angle of 270° 240° designed studied. As experimentally validated, the proposed antenna exhibits an omnidirectional pattern impedance bandwidth over...

Although some scaling law-based studies have been conducted for describing the asymptotic capacity of Vehicular Ad Hoc Networks (VANETs), obtained results are not easy to directly use estimating actual a communication link or entire network. To overcome this drawback, an interference-based analysis is carried out in letter abstracted 1-dimensional VANETs scenario. For reasonable and tractable modeling, classic Car-Following model applied represent dynamic change inter-vehicle distance, which...

In this paper, we investigate multi-cell coordinated scheduling and power allocation in downlink long term evolution advanced (LTE-A) systems, where orthogonal frequency division multiple-access (OFDMA) is used. The proposed scheme performs joint scheduling, allocation, modulation coding (MCS) selection to maximize the overall weighted throughput with proportional fairness. Our considers practical constraints LTE-A systems. Since optimization problem a combinatorial non- convex one high...

A promising solution to satisfying the demand for flexible and elastic networks in an unexpected or temporary event is constitute drone-cells, which are formed by quick deployment of unmanned aerial vehicles (UAVs). The multidimensional ground-air resources drone-assisted make resource allocation a critical issue future cellular networks. UAV placement algorithm proposed that utilizes global view characteristics software defined (SDCNs). utility maximization problem formulated study...

A novel design approach to wideband, dual-resonant microstrip annular sector patch antenna (MASPA) is proposed. As mathematically revealed by the dominant eigen-equation, MASPA with increased backfire radiation can be evolved from a truncated leaky-wave antenna. Then, general relationships between ratios of outer/inner radii, flared angles, and operational modes are deduced. The outer arc set as magnetic wall or open-circuited while inner one an electric short-circuited, such that patch's...

In this paper, we investigate the scheduling and power allocation for coordinated multi-point transmission in downlink long term evolution advanced (LTE-A) systems, where orthogonal frequency division multiple-access is used. The proposed scheme jointly optimizes user selection, allocation, modulation coding (MCS) selection to maximize weighted sum throughput with fairness consideration. Considering practical constraints LTE-A MCSs resource blocks assigned same need be same. Since...

Circular sector patch antenna with circumferential short-circuited, wide beamwidth characteristic and low profile is presented studied. Two radial-resonant magnetic dipoles asymmetric boundary have been placed the radiation principle analyzed. As will be seen, resultant would exhibit a E-plane of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{90^{\circ}}$</tex> maintain greatly 0.036-guide wavelength.

Designs of wideband, dual-resonant circular sector patch antennas with very low profiles no higher than 0.03-wavelength are presented. A set approximate formulas based on multiple eigenmode-resonant theory provided to determine the initial size antenna. Pin-loaded technique is employed tune antenna and lead a low-profile characteristic. As validations, prototype air substrate thickness 2mm (i.e., 0.019-wavelength) fabricated, measured verified at 2.8GHz-band. Compared conventional same...

Amtrak launched the first high-speed Acela Express passenger train service in USA 2000 on Northeast Corridor (NEC) between Washington, D.C, New York, and Boston. The NEC infrastructure is used by several other railroad/transit agencies that operate commuter services under operating access agreements with Amtrak. With such an arrangement, all contribute to electrical demands of traction power system southern division particular, D.C. conduct periodic reviews cost-sharing arrangements for...

We investigate the energy efficiency in downlink of a two-tier heterogeneous cellular network with quality service consideration. By modeling distributions macrocell and small cell base stations follow two independent homogeneous Poisson point processes, we derive analytical expressions mean achievable rate assumption that mobile user connects to closest BS. In addition, evaluate subject constraint blocking probability. Considering dynamic variation traffic load, use numerical results show...

The radiation behavior of multi-resonant wideband null frequency scanning microstrip patch antennas is studied in this paper. relationships between the range, antenna heights and flared angles have been intensively discussed. study reveal that little influence on tendency angle range will be widened with increase while decrease available bandwidth (ARB). tradeoff ARB sensitivity (NFSS) specifically studied. In order to obtain wider higher sensitivity, height should carefully optimized.

In view of the various quality service (QoS) requirements raised by different applications vehicular ad hoc networks (VANETs), characteristic communication capacity is vital for design and implement Intelligent Transportation System (ITS). Although some scaling law-based results had already been obtained VANETs to describe general performance changing pattern when total number network nodes goes infinity, they cannot be used directly estimate actual a pair or entire network. To make up with...

Considering the different quality of service (QoS) requirements posed by various applications vehicular ad hoc networks (VANETs), characteristic communication capacity is vital for design Intelligent Transportation System (ITS). Although some scaling law-based results had already been obtained VANETs to describe general performance changing pattern when total number network nodes goes infinity, they cannot be used directly estimate actual a pair or entire network. To make up with this...

In this paper, a novel linear polarized cavity-backed antenna based on normal InP HBT technology is proposed and simulated. design, half-mode substrate integrated waveguide (HMSIW) technique used to create radiating aperture, which helps minify the reduce cost. The numerically investigated using HFSS. simulated results show that has an impedance bandwidth about 3 GHz at center frequency of 60 GHz, in gain radiation efficiency antennas beyond 3.8 dBi 89%, respectively. Compared with...

This paper presents a bandpass switchable filter for 6–11GHz applications which is housed in machined aluminum chassis. The circuit consists of three fixed interdigital microstrip filters and two single-pole triple-throw (SP3T) microelectromechanical systems (MEMS) switching networks achieved by the individual series-shunt MEMS switch chips. A tuning range 36.6% was from 6.7 to 9.7 GHz with fractional bandwidth 21.1±2.7%, low mid-band insertion loss ranging 2.6 dB 3.0 dB. Rejection below -50...