Dejan N. Milic

Thermal Energy Harvesting Wireless Sensor Node in Aluminum Core PCB Technology

This paper reports the design of a self-powered telemetric wireless sensor node for temperature measurement. The device is realized with a conventional off-the-shelf thermoelectric generator as a power source. It is sandwiched between two aluminum core printed circuit boards (PCBs). One board is exposed to the heat source and has the role of a heat collector, whereas another one with the mounted low profile heatsink acts as a heat spreader. Electronic components of the node are placed on the inner surfaces of the boards. Implemented step-up circuitry is accommodated to achieve stabile cold boot of the node at a low temperature difference between its hot side and ambient (less than 15 °C), even when it is in thermally inefficient position. Operational autonomy of the node in the absence of the heat source is extended by 30% comparing with the common step-up circuitry implementation. The aluminum core PCBs provide node simplicity and compactness, with small overall dimensions.

A New Class of Low Complexity Low-Pass Multiplierless Linear-Phase Special CIC FIR Filters

This letter presents a new class of selective low-pass multiplierless linear-phase special CIC FIR filter functions of low complexity given in an explicit cascaded compact form. Several examples of the proposed filters are illustrated. They are compared in a fair way with conventional CIC FIR filters for the equal values of group delay and the same number of cascade sections. An example of the new class of the proposed seventh order filter with nine cascades is presented, where its stopband attenuation has high value of 143.82 dB, while corresponding conventional CIC FIR filter with the same filter order and the number of cascades has only 115.18 dB.

SOLITONS IN ALPHA-HELIX PROTEINS BY HE'S VARIATIONAL PRINCIPLE

This paper studies the dynamics of solitons due to solitons in α-helix proteins. The analysis is going to be carried out by the aid of Hes semi-inverse variational principle. The constraint relation between the soliton parameters will also be determined in order for the soliton to exist.

PERFORMANCE OF DUAL-HOP RELAYING OVER SHADOWED RICEAN FADING CHANNELS

Performance of Dual-Hop Relaying Over Shadowed Ricean Fading Channels In this paper, an analytical approach for evaluating performance of dual-hop cooperative link over shadowed Ricean fading channels is presented. New lower bound expressions for the probability density function (PDF), cumulative distribution function (CDF) and average bit error probability (ABEP) for system with channel state information (CSI) relay are derived. Some numerical results are presented to show behavior of performance gain for the proposed system. Analytical exact and lower bound expression for the outage probability (OP) of CSI assisted relay are obtained and required numerical results are compared.

New CIC Filter Architecture: Design, Parametric Analysis and Some Comparisons

ABSTRACT A new CIC filter architecture, i.e. CIC (cascaded-integrator-comb) FIR (finite impulse response) filter functions, designed by introducing spreading of the delays in the comb stages is presented here. The design forms of modified CIC filters that approximate simultaneously both magnitude and group delay specifications are given. The benefit of the novel filter class is demonstrated by a few example filter functions and their comparisons with existing classical CIC structures and one technique given in the literature. The effect of the compensation filter on the frequency response (reduction of the passband droop) is also shown. The novel cascaded-filter architecture has valuable benefits: wider passband range, higher insertion loss in stopband, as well as smaller values of integer coefficients of the impulse response.

An approximation of filtered signal envelope with phase noise in coherent optical systems

We examine the approximation of the probability density of a filtered signal envelope in the presence of phase noise. The probability density function (pdf) is of practical interest, especially for the performance evaluation of coherent optical systems employing envelope detection. We consider a few possibilities for approximate pdf construction, and develop simple, yet very accurate, expressions to describe the envelope of a filtered signal influenced by phase noise. To check the accuracy, we use the approximation for performance evaluation of a coherent optical frequency-shift keying (FSK) receiver, and compare the results with those obtained from existing methods.

Evaluation of optimal bandwidth in optical FSK system influenced by laser phase noise

In this paper, an optical frequency shift keying (FSK) system with TFS (two-filter structure), also known as dual-filter FSK, is observed in the presence of laser phase noise. Sensitivity of the receiver is shown as a function of intermediate frequency (IF) bandwidth and a bandwidth of the low-pass postdetection filter. It is shown that there is an optimal pair of bandwidths which minimizes required sensitivity; a few figures for different amounts of phase noise are given. The results in this paper are based on truncated Taylor expansion method and a method based on complex analysis is used to evaluate the integrals involved.

ABER performance of dual-hop system over asymmetric fading channels with interference at the relay

This paper studies the performance of a dual-hop amplify-and-forward (AF) system where the source-relay and relay-destination channels experience Rayleigh and Rician fading, respectively. The relay node is corrupted by Rayleigh faded multiple co-channel interferences. Based on proposed system model, new closed-form expression for the average bit error rate (ABER), in the case of several modulation formats, is derived. Numerical results are performed in order to verify analytical approach.

Comparison of certain methods for performance evaluation of coherent optical FSK systems

In this paper, we examine the use of different methods for performance evaluation of coherent optical FSK systems. Taylor expansion method (TE), numerical solution of Fokker-Planck (FP) equation and Gausian quadrature rule (GQR) are compared in terms of system error probability. A method for numerical solution of FP equation is proposed. Construction of GQR from moments and modified moments is considered and the numerical stability of GQR is investigated.

Performances of the novel modified CIC FIR filter functions

Design of novel selective multiplerless Cascaded-Integrator-Comb (CIC) finite impulse response (FIR) filter functions with applications in modern communication systems is presented here. Performance comparisons of the modified CIC filter functions and the classical CIC filter functions through a few design examples are also presented. Novel designed filter functions show substantial performance improvements compared to classical CIC filters. Depending on the chosen filter order, the achieved improvements are from 6.70 % up to 43.44 %.