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This paper is focused on input impedance optimization of a stripline. The stripline for electromagnetic susceptibility testing represents a radiating structure which is composed of one active and one or more grounded conductors. The characteristic impedance of the stripline is given by the dimension and the material between conductors. If the characteristic impedance does not match to the output impedance...
The utilization of the de-embedding method for Electromagnetic Compatibility (EMC) component measurements in automotive applications presents a practicable solution approach for improved attenuation measurement results of the device under test (DUT). The attenuation of a component prevents the passing on of conducted emissions inside the car from the mostly screened high-voltage level to the unshielded...
Adaptive or Active Noise Control System (ANC) is now widely used in many applications. The problem of interference or noise cancellation is one of the main focuses of the ANC solutions. In this paper, two classic ANC systems called a single-channel feedforward system and a single-channel feedback system will be simulated in MATLAB/Simulink environment for a demonstrative university classroom. This...
Indoor localization technique is very helpful for rescuing people in disaster relief. However, since the existing communication facilities may shut down and the indoor environment can be changed (damaged) under disaster conditions, the traditional localization scheme is likely to cause a large estimation error and even may not work. In this paper, we propose a new indoor localization scheme for disaster...
In this paper, we investigate the impact of different parameters on channel characteristics in a high-speed train (HST) ray tracing tunnel channel model. Signal propagation in HST tunnel scenarios differs much from that of other HST scenarios due to the unique construction of tunnels. Ray-tracing method is applied to analyze the received power and power delay profile (PDP) of tunnel channel models...
Electrical parameter such as conductivity and permittivity of the ground are varies depends on terrain conditions. These parameters can affects lightning electromagnetic fields (LEMFs) observed at particular point from the striking location. In this study, the results of LEMFs in the presence of vertically stratified ground arereported. Lightning return stroke channel current is modeled using the...
This paper studies the effects of foam on the transmission and reflection of microwave signals for radar instruments used in level measurement. A test scenario consisting of a periodic two-dimensional wet monodispersed foam layer at the separation boundary between two media was modeled. The bubble size, number of layers and material properties were parametrically controlled to cover a wide range of...
The performance of wireless cellular networks in indoor scenarios is in large parts characterized by the blockage objects such as walls. These objects can be included in the system model in several ways. We present in this paper different wall generation methods, ranging from approaches from random shape theory (in 1-D and 2-D) to semideterministic and heuristic approaches. To attain comparable results,...
The Free Space Optics (FSO) proves to be a very effective and efficient technology for wireless communication. This emerging field basically uses invisible beams of light such as ultraviolet, infrared, etc. in order to provide optical bandwidth connections providing a high data rate than other technologies. This work exclusively deals with the designing of FSO systems using the simulation software...
A new DC cancellation technique for a mixer-first receiver in UHF RFID reader is presented in this paper. A band-pass filter composed of an inductor and a capacitor is proposed to cancel the large DC component caused by the carrier leakage at the output of the passive mixer where the mixer is the input stage of the receiver to achieve a high 1dB compression point. Simulation results indicate that...
The capability of relatively high-speed short-range communications of Autonomous Underwater Vehicles (AUVs) in underwater scenarios, for example, for communication between vehicles or when the AUV is approaching a docking station for downloading of data gathered during a survey mission, is becoming a relevant application in the context of sea exploration and mining. In this paper the analysis of the...
Narrow-beam laser communication (lasercom) can enable high-rate, long-range undersea communication. Light in the beam is absorbed and scattered by suspended particulates, altering the spatial, angular, and temporal properties of the transmitted light. Development of high quality data links is aided by accurate simulations that can be adapted to different water conditions, from turbid harbors, to clear...
This paper presents possible solution of fractional-order high-pass filter (FHPF) with electronically adjustable order between 1 and 2 and also with electronically adjustable pole frequency. It is based on well-known Follow-the-Leader Feedback (FLF) topology adjusted for utilization with operational transconductance amplifiers (OTAs) and adjustable current amplifiers (ACAs). This 3rd-order topology...
A coaxial coupler for 6–18GHz wide-band helical traveling wave tube (HTWT) is designed and simulated using CST Microwave Studio. A simulation model with a section of helical slow wave structure as well as a hypothetical attenuation is adopted to test the performance of the coupler. VSWR less than 1.4 through 6–18GHz is successfully realized. Furthermore, the shape of the inserted attenuation pattern...
Machine-to-Machine communications networks for Smart Grids must meet specific requirements from both technical and economic perspectives. Power Line Communications are indeed winning momentum in this area because they provide a great trade-off between both dimensions. In particular, Broadband Power Line Communications over Medium-Voltage distribution grids are of special interest to Distribution System...
Wireless Underground Networks (WUN) have many applications, such as border surveillance, agriculture monitoring, and infrastructure monitoring. Recent studies have shown that they are feasible and have deployment advantages over wired networks, but only a few WUN evaluations in multiple access scenarios have been done. This paper presents a simulation study on medium access for a WUN with 4 nodes...
Full-duplex wireless communication is deemed to have remarkable application prospect for the possibility in enhancing the spectrum efficiency by 2 times. However, the strong transmitted leakage signal causes serious self-interference for the full-duplex system. To address this question, a new sectional type full-360° phase-shifter and a gm-tunable LNA are proposed for the feed-forward self-interference...
This paper investigates the eavesdropping attacks in underwater acoustic networks (UANets). In particular, we propose an analytical framework to model the eavesdropping attacks in UANets in terms of the eavesdropping probability. Results of extensive simulations match the analytical results, indicating the effectiveness and accuracy of our model. Besides, we also find that the eavesdropping probability...
With the continuous expansion of international terrorist organizations, terrorists have been looking for ways to cause massive destruction, in which one of dangerous weapons is a radiological source. The explosion of radiological sources makes radioactive particles scattered over a vast area, causing radiation contamination. To avoid radiation disasters, there should be autonomous mobile robots that...
Background: In this paper, the phase modulation coding/decoding technology is discussed for the application in the high attenuation medium based on the simulation and the experiment. Methods: For the decoding perspective, the matched filter and the inverse filter are compared. An extra processing is introduced right after the matched filtering to restrain the range sidelobes. Furthermore, in the latter...
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