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Pollinators play a crucial role in ecosystems globally, ensuring the seed production of most flowering plants. They are threatened by global changes and knowledge of their distribution at the national and continental levels is needed to implement efficient conservation actions, but this knowledge is still fragmented and/or difficult to access.
As a step forward, we provide an updated list of around...
In this paper, a wireless three-hop relay communication system operating in a Rayleigh multipath fading environment is analyzed. The output signal from such a system is a product of signal envelopes from all sections, meaning that it is actually a product of three random variables (RVs) with Rayleigh distribution. We considered here the first-order characteristics: probability density function (PDF),...
In this paper, the product of three random variables (RVs) will be considered. Distribution of the product of independent random variables is very important in many applied problems, including wireless relay telecommunication systems. A few of such products of three random variables are observed in this work: the level crossing rate (LCR) of the product of a Nakagami-m random variable, a Rician random...
The expressions for probability density function (PDF) of the Switch and Stay Combiner (SSC) output signal to noise ratio (SNR) at one time instant and the joint probability density function of the SSC combiner output signal to noise ratio at two time instants in the presence of α-μ fading are determined in this paper. Then, these expressions are used for calculation of the Outage probability and...
In this paper, the probability density function (PDF) of complex dual SSC/MRC combiner output signal at two time instants, in the presence of Gamma fading, will be determined in closed form expressions. Then, the bit error rate (BER) will be calculated and shown graphically combiners versus parameter Ω, for different types of combiners and different values of correlation coefficient ρ.
The second order statistics for switch and stay combining (SSC) receiver is analyzed in this paper. The level crossing rate and the average fade duration of the SSC combiner output signal are determined in the presence of α-μ fading at the input. The obtained expressions are in closed form. The results are shown graphically for different fading parameters.
The probability density function (PDF) of the Switch and Stay Combiner (SSC) output signal at one time instant and joint probability density function of the SSC combiner output signal at two time instants in the presence of gamma fading will be determined in the closed form expressions. The results will be shown graphically for different variance values and decision threshold values. The bit error...
The performances of Maximal Ratio Combining (MRC) receivers in the presence of G fading over L independent diversity reception paths are presented in this paper. Coherent Binary Phase Shift Keying (BPSK) modulation is applied. For the bit error rate (BER) determination, the approach with moment generating function (MGF) and alternative representation of Gaussian Q-function are used. The bit error...
The performance of the MRC receiver in the presence of composite fading that consists of multipath Nakagami-m fading and shadowing is considered in this paper. The shadowing is modeled by log-normal distribution for composite Nagami-m - lognormal, gamma distribution for generalized-K and inverse-Gaussian distribution for G distribution. The probability density function, the outage probability and...
In this paper, the satellite communication system consisting of the earth transmitting station and the satellite transponder is considered. Switch and stay combining (SSC) diversity technics are used on receiving satellite and receiving earth stations to reduce fading influence to the system performances. The presence of Nakagami-m fading on receiving satellite and receiving earth stations is observed...
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