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The design and performance of two compact monolithic spiral quadrature couplers are presented, employing a novel configuration of mutually coupled coils. The first, designed at 20.35 GHz, occupies 131 × 142 μm and achieves 0.5 dB fractional bandwidth of 19%, with phase error and intrinsic loss below 2.6° and 0.92 dB, respectively. The second, designed at 30.15 GHz with 5.24 dB coupling coefficient,...
Increasing bulk data transfers have been overwhelming the Internet. To overcome this, optical circuit-switched (OCS) networks are equipped with assistive storage, so that bulk data that are delay tolerant can be temporarily stored at intermediate nodes and forwarded at later times. But, the use of storage greatly complicates the routing problem, since data storage must be incorporated into routing...
This paper introduces an analog bandwidth mismatch compensation technique for Time-Interleaved Analog-to-Digital Converters (TI-ADCs). It takes advantage of a Fully Depleted Silicon On Insulator (FD-SOI) technology to compensate for the bandwidth mismatch errors among channels. Our technique utilizes the body-effect to adjust the on-resistance of the sampling switch, by means of a 6-bit Digital-to-Analog-Converter...
In this paper the mathematical model of multicast routing of flows with support shared explicit reservation of link resources is proposed. The proposed model consists of a linear expressions, which are responsible for providing the connectivity of the calculated multicast routes, and also the absence of loops in them. The novelty of the model is the using of conditions of prevention the congestion...
SMA connector is widely used in the high-speed interconnection system. As more designs move toward high-speed serial links with picosecond edge rate, the signal integrity problems caused by the transition structure from SMA connector to the PCB cannot be neglected, especially for precise AFR calibration. To solve this problem, we present four optimization methods, including optimizing the size of...
Notch identification is a major challenge in Frequency Coded (FC) chipless RFID. The main objective of this contribution is to introduce three signal processing techniques for notch identification and detection. The three algorithms are Matched Filter(MF), Window Based- Singular Value Decomposition (WB-SVD) and Dynamic Time Warping (DTW). The algorithms should be able to detect both notch bandwidth...
In this paper we consider the necessary condition for the recoverability with probability close to one (3 sigma criterion) of a band-limited band-passed signal from event-based samples. Specifically, we consider sampling events derived from non-zero level crossings of a stochastic differentiable signal on a finite time interval. Using a Fourier approach we write the system in matrix form allowing...
Magnetic interaction can be utilized for remote actuation of surgical manipulators. However, platforms currently available for that purpose have limited workspaces, inadequate field strength or very low bandwidth of the electrical subsystem. In this paper, we present BigMag, a novel platform capable of magnetic steering of continuum manipulators for medical purposes. BigMag comprises of 6 mobile coils...
Multiscale systems are characterized by dynamics that evolve over different times scales and are encountered frequently in process industries. Conventional identification techniques yield poor results when applied directly to MS systems because of their inherent assumption that the system evolves at a single scale. In this paper, we discuss the key challenges in the discrete-time (DT) identification...
One of the goals of 5G wireless systems stated by the NGMN alliance is to provide moderate rates (50+ Mbps) everywhere and with very high reliability. We term this service Ultra-Reliable Ubiquitous-Rate Communication (UR2C). This paper investigates the role of frequency reuse in supporting UR2C in the downlink. To this end, two frequency reuse schemes are considered: user-specific frequency reuse...
A compact wideband quarter-wave transformer using microstrip lines is presented. The design relies on replacing a uniform microstrip line with a multi-stage equivalent circuit. The equivalent circuit is a cascade of either T or π networks. Design equations for both types of equivalent circuits have been derived. A quarter-wave transformer operating at 1 GHz is implemented. Simulation results indicate...
The rapid revolution of cloud computing model is accompanied by huge amounts of energy consumed by the cloud data centers. So, enhancing the energy efficiency of those data centers has become a major challenge. This paper tackles the problem of enhancing the energy consumption of cloud data centers by proposing a novel virtual machine placement strategy. The proposed strategy suits both static and...
LTE networks are deployed to increase capacity and coverage especially for the indoor and cell-edge mobile users. However, such deployment comes with major challenges, radio resource management and inter-cell interferences. Fractional Frequency Reuse mechanism (FFR) is one of the most effective interference avoidance techniques. In this paper, we evaluate an existing adaptation process that adjusts...
This article, the FM bandwidth scaling technique under injection locked and super-harmonic injection locked phenomenon, which explained by forcing oscillation perspective with multi-time variable technique is presented. By forcing FM signal to harmonic oscillator, the FM bandwidth can be scaled. This scaling technique separated in two situations, the first one is an expansion technique under injection...
A new type of broadband miniature antenna consists of helical dipole folded by central conductor is presented in this paper. Besides a brief analysis, the experimental results show the good performances of wider bandwidth (25%–40%), higher input impedance(about 200 Ohms), and flexible for designing, it is suitable to be used as both mobile vertical antenna and excitor of Yagi antenna.
The extraction of weak signals from noisy backgrounds is an important part of the modern information theory. Traditional methods based on linear systems such as filtering have limitation in such applications while Chaos theory has more advantage, which becomes an important research direction. In this paper, the nonlinear chaotic Duffing oscillator is studied and simulated for its phase trajectory,...
In this paper, we consider the event triggered control of the singularly perturbed linear system, where the communication between sensor and the controller/actuator is through a digital communication network and the transmission is based on some state dependent criterion. The models of slow and fast subsystems of the plant are added at the controller and are used for the estimation of states between...
This paper discusses a cost-effective technique for dynamic testing of DC-DC power supplies, based on the injection of a signal into the feedback loop of a DC-DC regulator, which makes it operating as a dynamic source or a dynamic load. The theoretical background and the practical implementation of the technique are investigated. Guidelines are provided to determine the static set-up and the bandwidth...
New developments in energy efficient wireless communications systems and indoor location and tracking algorithms have created a greater demand for accurate propagation models. In this paper a frequency domain full wave propagation model is used to produce accurate power delay profile information. The propagation model is based on the volume electric field integral equation (VEFIE). The VEFIE is solved...
This paper focuses on placement and chaining of virtualized network functions (VNFs) in Network Function Virtualization Infrastructures (NFVI) for emerging software networks serving multiple tenants. Tenants can request network services to the NFVI in the form of service function chains (in the IETF SFC sense) or VNF Forwarding Graphs (VNF-FG in the case of ETSI) in support of their applications and...
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