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Development of modern infocommunication and radiotechnical systems demands creating of postcorrelation theory for adequate representing of signal-noise situation when signals and noises have non-Gaussian distributions. In the report, the proof of the existence of integral transformation of one-dimension variate is presented. Conditions of existence and properties of stochastic spectra are shown. The...
Received signal strength indicator (RSSI) are mostly used to measure distance in wireless sensor networks (WSNs). It is difficult to avoid the error of RSSI ranging due to the complexity of the indoor environment. However, the localization error of the existing localization algorithm will increase greatly with the increase of ranging error. In order to improve the positioning accuracy, stability as...
Networked Music Performance (NMP) constitutes a class of ultra-low delay sensitive applications, allowing geographically separate musicians to perform seamlessly as a tele-orchestra. For this application type, the QoS indicator is the mouth-to-ear delay, which should be kept under 25 milliseconds. The mouth-to-ear delay comprises signal processing latency and network delay. We propose a strong collaboration...
In this paper, a transfer function that models Molecular Communication via Diffusion (MCvD) between a point transmitter and a fully absorbing circular receiver in an unbounded 2-D environment is analytically derived. The analytical derivation of the transfer function of the 2-D channel in MCvD is proposed for the first time in the literature. The transfer function is obtained by solving the molecule...
A novel approach to simulation of communication channel in the presence of intersymbol interference is introduced in the paper. The distinctive feature of the approach is accurate defining of information parameter at the output of communication channel. A new model for additive white Gaussian noise is presented.
Modern wireless communication raise the demand for higher spectral efficiency, faster-than-Nyquist (FTN) signaling is able to increase transmission rate without expanding signaling bandwidth. In this paper, we develop a graph-based iterative FTN detector in the presence of phase noise (PHN). Wiener process is employed to model the time evolution of nonstationary channel phase. The colored noise imposed...
Human activity recognition based on wireless signals emerges as a research hotspot recently. Though tremendous efforts have been devoted and significant progresses have been achieved, one fundamental issue still remains open, i.e., theoretical modeling between signal dynamics and human activities. This paper fills in the blank by addressing several theoretical issues and providing insightful mathematical...
We present a three-dimensional scheme that can be used to compute the electromagnetic impulse response between any two subsurface points from surface reflection data measured at a single surface of a lossless medium. The scheme first computes a virtual vertical radar profile using the Marchenko scheme from which focusing wavefields are computed. With the aid of the Green's functions of the virtual...
This paper looks into the modelling of the ACUREX distributed solar collector field at the Plataforma Solar de Almería (PSA). ACUREX possesses resonance characteristics that lie well within the desired control bandwidth and quite commonly is modelled by dividing the receiver tube in the solar collector field into a number of segments. However, the number of segments has varied significantly in the...
Passive radar detection systems based on Global Navigation Satellite System (GNSS) signals have the advantages of wide coverage, long detecting distance and good concealment. If effectively combined with the forward scatter radar (FSR) principle, it can be used to monitor an important area, which is of great significance to national defense security. This paper mainly focused on the analysis of signal...
The structure of the back-scattered radiation of ground based on radio-electronic equipment from space facilities system is described. The utilize methods and separate parts of devise system of back-scattered radiation from space debris is considered. The simulating model of the system in the Simulink/Matlab software, allowing to develop and analyze system processes, as well as to study the operation...
In many CMOS analog/RF circuits, such as passive mixers or N-path filters, the transistor operates as a switch. Switching circuits often experience source-drain reversal, and most transistor models exhibit discontinuities in second and higher-order derivatives of the drain current around zero drain-source bias. This introduces fundamental challenges in performing third-order inter-modulation distortion...
Low noise receivers are critical in telecommunication systems. Lower the noise, the less transmission power is required to receive a signal within a given distance. This has a major impact on energy consumption and hence longer battery life. Noise contribution of a receiver is often specified by its noise figure. It is the ratio of the signal to noise power ratio at the input, Si/Ni, to the signal...
This paper discusses a model for the harmonic analysis of full bridge diode rectifiers in Wireless Power Transfer Systems (WPTSs). The proposed model is based on an iterative algorithm which identifies the zero crossing of diodes currents, including the threshold voltage, the state-dependant differential resistance and the parasitic capacitance of diodes. The algorithm has been solved in MATLAB and...
Small unmanned aerial systems (UAS) require constant, safety-critical connectivity for telemetry, command-and- control, and collision avoidance. Today, dedicated, short-range pilot-to-aircraft links provide this connectivity for UAS operation. For UAS operating in fleets and beyond line-of-sight, a robust multi-transmitter network to provide connectivity over a wide area will be needed. However, networks...
The through-the-wall inverse scattering problem is analyzed via the linear sampling method. The reciprocity gap formulation of the linear sampling method is used to reconstruct an object within a closed-off room. In order to apply this method, a numerical method to model a point source is needed, along with knowledge of how the numerical fundamental solution differs from the analytic one. Application...
This paper proposes a model based approach to the development of a wireless biotelemetry communications system model that enables early architecture trades and optimization for safety, performance and power efficiency. This integrated system model is constructed using a model based engineering framework which enables the digital integration of requirements, architecture and disparate performance models...
The objective of this paper is to find a way for simulating the channel in molecular communication. In molecular communication, transporting the data happens through propagation of the micro-scale particles in a fluid or gaseous medium. Molecules move through the channel due to diffusion and thus transfers the data between receiver and transmitter. In order to model this type of communication channel,...
Molecular Communication (MC) is an enabling paradigm for the interconnection of future devices and networks in the biological environment, with applications ranging from bio-medicine to environmental monitoring and control. The engineering of biological circuits, which allows to manipulate the molecular information processing abilities of biological cells, is a candidate technology for the realization...
This paper studies and implements the existing encryption algorithm on 16-bit DICOM images using quaternions as the key, around which, the pixels of an image are rotated to get another image suitable for transmission over a network, such as internet, to the intended receiver. The existing algorithm is a strong encryption method that gives commendable results for random number sequence generation performed...
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