Volume 59, Nº 7 (2016)

A new general approach to building the filtering methods has been created on the basis of minimum duration principle.Aclass of filtering methods for noisy fixed signals was developed within the framework of this approach. The specified class depends on three freely adjustable parameters and includes the known methods of averaging, median, myriad, and meridian filtering. The efficiency of the proposed approach is achieved by the adjustment of free parameters to their optimal values that depend on the noise scale (dispersion), magnitude of the weight of tails and distribution law waveforms. The general statement and partial statements of the problem of filtering the noisy fixed signal were formulated for a discrete case. The above statements were presented in the form of appropriate optimization problems. Numerical simulation results for the filtering problem of fixed signal distorted by the Gaussian, Laplace, Cauchy noises and mixtures of these noises were also presented.

Paper presents the simulation of processes of spatial localization of objects using systems of radio-frequency identification (RFID systems). The simulation technique for simulation modeling the measuring data of proximity type, received signal strength (RSS) type, and read rate (RR) type obtained from passive RFID-tags has been developed. The technique allows us to carry out the preliminary comparison of localization accuracy ensured in case of using different algorithms of localization and types of measuring data for arbitrary regions of localization. The testing of this technique indicated that the relative error of simulation results as compared to experimental results amounted on average to 8% and did not exceed 28%.

In this paper we propose and investigate a unique compact FR4 based CPW-fed tri-band antenna for wireless applications. The antenna comprises frequency shifting strips and a defected ground structure (formed by combining of metallic strips and cutting of an L-shaped slot from the ground). The proposed antenna provides three different impedance bandwidths of 0.57, 0.98 and 1.59 GHz which are sufficient to cover the frequency band of GSM 1800/1900, WLAN 5.5/5.8 GHz and WiMAX applications. The developed antenna has a size of 17-20 mm and operates over frequency ranges 1.50–2.08, 5.25–6.23 and 9.10–10.69 GHz centered at 1.702, 5.802 and 10.102 GHz, respectively. The antenna was designed and simulated using Ansoft HFSS software. The antenna’s characteristics such as reflection coefficient, radiation pattern, impedance bandwidth and VSWR are presented.