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Room transfer function (RTF) is the room response observed at a particular listening point due to an impulse generated from an omnidirectional point source. Typically, measured RTFs in practice are often erroneous due to the directivity of the measurement loudspeaker. This paper formulates a spherical harmonic based parameterization of the room response for a directional loudspeaker, and provides...
This paper compares the properties of traditional digital phase-locked loops based on multi-bit, high-resolution time-to-digital converters and those based on bang-bang phase detectors. Novel analysis is presented which show that bang-bang digital PLLs allow better phase noise and spur performance at lower power consumption, area and complexity. It will be also demonstrated that this property can...
This paper is devoted to the development of the extended multi-commodity flow model in order to provide optimal routing based on the criteria of quality of service and minimal maximal channel utilization. Since most of the models consider these criteria separately and do not consider different requirements of flows to quality of service, the proposed model allows to close this gap by allowing to achieve...
In this paper we propose an online, reward-based routing and spectrum assignment (RSA) method for multirate flex-grid optical networks. The method, denoted as MDP-RSA, is derived from a flex-grid optical link model based on the theory of Markov decision processes. Assuming that connections arrive randomly offering a reward to the system, the objective is to take the best decision on admission, routing...
A key principle for optimizing network performances is to understand the relationship between network topology, configuration parameters, and their influence on the behavior of network protocols. While an attractive approach to this problem is to use formal models of protocols in combination with mathematical optimization, such methods are often limited by either poor scalability or approximations...
Equivalent systems method was implemented for designing the resonator slow-wave structures in plasma-beam devices, and non-impact plasma was used for the filling of the transit channel. The collation of the calculation results demonstrates the adequacy of the developed model in comparison with the real devices and structures. The analysis of the slow-wave structure dispersion characteristics was carried...
Polarization diversity is generally achieved by using two orthogonal polarizations on the same link, which enables to double the available bandwidth. In this paper, we study the possibility to connect the nodes of a line-of- sight ring topology network with one single channel for all the links, with the condition that the polarization of any link is orthogonal to the polarization of the two adjacent...
This paper proposes two parallel hybrid heuristics aiming for the reduction of the average bandwidth of sparse matrices, process used in systems of equations preconditioning. Based on a direct processing of the matrix, the first method combines a heuristic inspired from the laws of physics, with a greedy selection of rows/columns to be interchanged. The second one improves the previous heuristic through...
Internet service providers (ISP) are deploying software defined networking (SDN), which enables them to better utilize their resources and increase their revenues by offering on-demand differentiated services. In particular, SDN makes provisioning of dynamically managed video services with multiple levels of service viable, since the controller has complete vision of network resources and can change...
We analyze the merits of modular node architectures in number of line interfaces required, for multi-period planning with and without traffic churn. The impact of supporting traffic re-grooming and increasing slot capacity are highlighted.
A novel method for binaural source localization using a HRTF data model with enhanced frequency diversity is proposed in this work. The method proposed herein is developed in the frequency domain and enhances the directional information in the sound signal for efficient broad band sound source localization even under conditions of low SNR. The directional information is enhanced by cancelling the...
A Wide-Band (WB) radio frequency (RF) system has been thoroughly developed in order to measure the Subcutaneous Fat (SF) thickness in the abdominal region of humans. Recent conducted research has shown that the SF thickness is related to the thickness of internal fat called Visceral Fat (VF), which has important health implications, and therefore cannot be measured accurately by non-invasive techniques...
Network virtualization (NV) is an indispensable approach to handle the ossification of current Internet. Previous research has been conducted concerning the implementation issues like heuristic-based mapping algorithms, yet little has focused on quality of service (QoS) for end users who launch virtual network (VN) requests, and revenue both service providers and infrastructure providers can obtain...
In order to meet the smart distribution grid's demand for communicating, a heterogeneous wireless network selection model is built. This model has 3 goals, real-time services' blocking rate, non-real-time services' mean transmission time, and network load. And the model is simulated by using the quantum clonal immune multi-objective optimization algorithm. Compared to the MLB algorithm and RBF-FNN...
This manuscript represents the two half circular gap coupled disk patch antenna stacked with D.G.S. (Defected Ground Structure) for dual-wideband application. The antenna has an overall size of 40.0×40.0×1.6mm3 and gives the results of dual band performance. The proposed antenna can be used in military communication, wideband global satellite communication systems (WGS) (9.43–10.08 GHz) and in Airport...
This paper presents a framework for the systematic design of inductor-less regulated cascode (RGC) stages. Targeting high-speed fiber optic data receiver front-ends, the technique reported combines the symbolic solution of the small-signal model of the RGC and the use of gm/ID based lookup tables to efficiently explore and optimize the resulting design space. A practical design is discussed and implemented...
VANETs relies on the repetitive exchange of Cooperative Awareness Messages (CAMs) among vehicle's OnBoard Units (OBUs) and vehicles to roadside units (RSUs), thus making CAMs the backbone of the network. This exchange may lead to degradation of network performance caused by the ample amount of data exchange between the vehicles. Therefore, a tradeoff between CAM broadcast within the network and...
Mobile telephony based on UMTS uses finite-state control schemes for wireless channels and for signaling across the network. These schemes are used systematically in various phases of the communication and are vulnerable to attacks that can bring down the network through unjustified bandwidth allocation and excessive signaling across the control plane. In this paper we identify those system parameters...
A fundamental component in the z-axis feedback loop of an atomic force microscope (AFM) operated in dynamic mode is the lock-in amplifier to obtain amplitude and phase of the high-frequency cantilever deflection signal. While this narrowband demodulation technique is capable of filtering noise far away from the carrier and modulation frequency, its performance is ultimately bounded by the bandwidth...
The feasibility of a systematic and effective control design for highly uncertain dynamic systems is tested on the well-known two-mass-spring benchmark problem, based on the active disturbance rejection control (ADRC) framework. The proposed solution is obtained in the absence of a detailed mathematical model, in contrast to all previous model-based solutions. In addition to meeting the design criteria,...
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