Bojana Nikolic

On the Effect of Imperfect Cophasing in MRC and EGC Receivers Over Correlated Weibull Fading

This paper presents a comparative analysis of dual-branch maximal-ratio combining (MRC) and equal-gain combining (EGC) receivers with coherent modulations over correlated Weibull fading channels. The numerical and simulations results show the influence of imperfect cophasing, branch unbalancing and correlation on the error performance. It is interestingly shown that EGC has lower irreducible error floor than MRC in the presence of incoherent combining, while the higher value of the correlation coefficient results to lower irreducible error floor. Furthermore, the unbalance parameter has practically no influence on the irreducible error floor.

Application of wireless sensors within a traffic monitoring system

The work describes a sensor system to monitor traffic-related data such as the number, type, and speed of vehicles on a road. Essential components like networked intelligent embedded systems for sensor data acquisition and aggregation and the antenna configuration are described and explained. Results of the application are illustrated.

Pdf of Dual EGC Diversity System for the M-ary FSK Demodulation in the Presence of Nakagami Fading and Intersymbol Interference

In this paper the receiver for the demodulation of M-FSK signals in the presence of Gaussian noise, intersymbol interference and Nakagami fading is considered. The communication systems performance can seriously be degraded by these interferences.

Outage probability of correlated SIR-based SSC diversity systems over composite K_G fading/shadowing channels

In this paper, the effects of multipath fading and shadowing over the propagation channel are observed through the performance analysis of switch and stay selection combining (SSC) technique. The short term fading (multipath fading) in conjunction with the long term fading (shadowing) are both modeled by Generalized-K (KG) distribution. The proposed system is considered as interference-limited system in correlated fading environment. The probability density function (PDF) of signal-to-interference ratio (SIR) at the output of SSC receiver is derived in form of Meijer G functions. According to this new expression, the outage probability is considered and the effects of fading and shadowing parameters and correlation coefficients on the performance gain are analyzed.

Vjerojatnost ispada koreliranih SIR prijemnika sa SSC raznolikosti putem kanala s kompozitnim K_G slabljenjem/zasjenjivanjem signala

In this paper, the effects of multipath fading and shadowing over the propagation channel are observed through the performance analysis of switch and stay selection combining (SSC) technique. The short term fading (multipath fading) in conjunction with the long term fading (shadowing) are both modeled by Generalized-K (KG) distribution. The proposed system is considered as interference-limited system in correlated fading environment. The probability density function (PDF) of signal-to-interference ratio (SIR) at the output of SSC receiver is derived in form of Meijer G functions. According to this new expression, the outage probability is considered and the effects of fading and shadowing parameters and correlation coefficients on the performance gain are analyzed.

Analysis of patch antenna with director in FDTD simulation environment

In this paper the influence of dimensions, geometry and position of the conductive director on the radiation and matching characteristics of the patch antenna are analyzed using an own developed simulation tool that is based on finite difference time domain (FDTD) method. The possibility of gain enhancement and broadening of the antenna bandwidth is investigated.

Effect of phase noise on error performance of DE-QPSK receiver over k-μ fading channel

This paper presents the error performance analysis of differentially encoded coherent quadrature phase-shift keying (DE-QPSK) transmission over k-μ fading channel. The imperfections of the carrier signal recovery are taken into consideration through the phase-locked loop error, which is described by Tikhonov distribution. Based on novel derived expression for average bit-error probability (BEP), numerical results are obtained. The influence of loops bandwidth-bit time product and fading depth on the system performance is investigated.

One efficient implementation of CPML in CE-FDTD algorithm

In this paper a modification of conventional convolutional perfectly matched layer (CPML) is performed in order to support termination of complex-envelope finite difference time domain (CE-FDTD) computational domain. The modified CPML, along with CE-FDTD algorithm has been implemented in an own developed simulation environment. The functionality of the proposed CPML is illustrated on the example of a planar excitation.

Implementation and accuracy analysis of ETD method in FDTD simulation environment

In this paper, the influence of two different time approximation techniques on the accuracy of the finite difference time domain (FDTD) method has been analysed. The following approximation techniques have been considered: time-average (TA) and exponential time differencing (ETD). Both algorithms have been implemented in an own developed FDTD simulation environment. In particular, an example of an on-body antenna on the human tissue is considered, as a possible case of interest.

On the effect of imperfect reference signal recovery on BER performance of PSK receiver in composite fading channel

This paper presents an analysis of the quaternary phase-shift keying (QPSK) signal reception over the composite KG fading channel in the presence of imperfect reference signal recovery. Two cases are considered: the reception over a single channel and diversity reception. In the case of diversity technique applied, selection combining (SC) and dual branch switched-and-stay combining (SSC) were employed. The simultaneous influences of the imperfect reference signal recovery, composite fading severity and average signal-to-noise ratio in the channel on bit-error rate (BER) performance are determined and discussed.