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In this paper we address the power allocation problem for a system of distributed passive radar sensor network, where the location of the source is relatively constant, aiming at lifetime maximization and power consumption minimization. It is known that for a network in which the source location changes independently at each observation step, a nearly-optimal strategy can be obtained by minimizing...
In this papers we address the optimal power allocation problem in a distributed passive radar sensor network system, where closely located nodes are capable of distributed beamforming. In this setup, the network of sensor nodes is viewed as a combination of node clusters, where each cluster is capable of time synchronization, and coordinated transmission. The goal of the network is to provide a reliable...
This paper regards a network of wireless passive sensors, suitable for radar applications. The network observes multiple number of target signals to be estimated. We propose an unbiased estimator whose error is minimized by optimizing both the power allocation at sensor nodes and the fusion coefficients at the fusion center. Since the underlying optimization problems are subject to both the individual...
In this paper we study a wireless passive sensor network. The sensors are deployed to estimate the true values of multiple active target signals. The sensors forward their observation to a fusion center, which processes the observation of each sensor by a set of fusion rules. One achievement of this paper is proposing an unbiased estimator with minimized variance of errors. To do so, we optimize both...
The paper discusses three main adaptive filtering algorithms with partial updates and low computational complexities that converge fast and have a significantly better mean square error (MSE) performance than their non selective-update versions when they are tuned well. The algorithms are set-membership normalized least mean squares (SM-NLMS), SM affine projection (SM-AP) and SM recursive least squares...
In this work the design of low power infrared transceiver ASIC with AMS350nm technology is presented. There are two different types of transceiver designs that have been developed. The first design is based on IrDA 9600 baud serial infrared (SIR) standard physical signal layer that uses split-phase Manchester coding technique and the second design is using uni-polar return zero coding (RZ) technique...
Light-Fidelity (LiFi) is the communication technology, which utilizes LEDs for both illumination and data transmission with a bidirectional link. In order to enhance the users mobility for indoor or outdoor environment, it is essential to choose the most appropriate receiver. LiFi systems suffer of a lack of receiver solutions about two great LiFi problematics: the integration of the receiver into...
This paper proposes applying optical wireless communications (OWC) for electrical equipment monitoring in high-voltage power grid. The fast development of power grid urgently requires reliable, efficient, and broadband wireless communication techniques for monitoring, protection, and control. High-voltage equipment and power-line, however, generate strong electro-magnetic (EM) field in its neighboring...
Technological advances in the miniaturization of millimeter-sized sensor motes facilitate new application cases where the motes' inherent energy constraints enforce radical changes with respect to the sensors' communication procedures. An upcoming application scenario is the surveying and exploration of hardly permeable and hardly accessible underground environments such as those of oil-sand mining...
Pressurized space modules of all types are at risk of depressurization due to leaking air. Leaks may be caused by space debris impact or structural aging and failure overtime. This paper addresses the issue of leak type detection by analyzing airborne ultrasonic waves through Fourier Decomposition and Singular Spectrum Analysis. Depending on the vessel material, size of the leak, and pressure gradient,...
Trajectory models have numerous applications in the area of wiewlwss communications. The aim of this paper is to develop an empirical trajectory model for drifted motions. Recently, a highly flexible trajectory model based on the primitives of Brownian fields (TramBrown) was proposed by A. Borhani and M. Pätzold. This paper provides an empirical proof for TramBrown using global positioning system...
Data Centers (DC) consume an enormous amount of energy, now accounting for about 1.5% of US electrical usage. However, part of this energy (server operation and cooling) can be saved by turning off idle servers. This can be achieved by rerouting workloads from partially loaded servers, and thus allowing additional idle servers to shut down. Workload rerouting could be done by optical wireless communication...
Data Center (DC) servers consume a huge amount of energy. However, a part of this energy (cooling and information technology devices) can be saved by shutting down racks containing idle servers. This can be achieved by rerouting workloads from partially loaded racks, and thus allowing additional racks to switch into idle mode. Workload rerouting requires additional wired links or by optical wireless...
1-D array of silicon nitride grating couplers is investigated in order to be used for point to point communications providing wide beam steering and large-radiated power. Both single antenna and phased array designs are studied numerically. Beam steering ability of up to 40° is achieved using a proper design of the antenna array.
The deep-space Ka-band channels are very sensitive to the weather conditions of the ground station area, where the data link will be suffered by high dynamic bit error rate and even occurred random interruption. Moreover, the huge distance of the deep-space communications caused that the transmitter can only have delayed channel state information (CSI) feedback. We modeled the noise temperature of...
Routing in Delay-/Disruption-Tolerant Networking (DTN) has long been recognized as a challenging research topic. The difficulty lies in the fact that link intermittency and network partitioning, possibly coupled with long delays, prevent the use of Internet solutions based on an up-to-date comprehensive knowledge of network topology, as communicated by routing protocols. In the literature on DTN routing,...
Due to the constraints of satellite platforms and Inter-Satellite Links (ISL), very limited ISLs can be equipped on the satellites, making the ISLs intermittently available. Meanwhile, the Ground-Satellite Links (GSL) are also intermittent due to the rotation between the constellation and the earth. Intermittent connectivity of both ISLs and GSLs makes the satellite constellation network a typical...
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