排序方式: 共有38条查询结果,搜索用时 15 毫秒
1.
Mihajlo C. Stefanovic Jelena A. Anastasov Aleksandra M. Cvetkovic Goran T. Djordjevic 《Wireless Communications and Mobile Computing》2015,15(18):2141-2149
The outage performance of the amplify‐and‐forward relaying strategies over mutually uncorrelated extended generalized‐K fading channels is addressed in this paper. The attention is dedicated to the analyses of the noise‐limited and also interference‐limited environment. The new analytical expression for outage probability of observed relaying system in the presence of thermal noise is derived using the method for approximating equivalent signal‐to‐noise ratio. In addition, the outage performance is studied for the dual‐hop system when only the single dominant co‐channel interference is inherent at the relay and destination node. The correctness of the proposed mathematical derivations is verified by simulations. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
2.
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 相似文献
3.
The authors determine the bit error rate of a digital satellite system with phase modulation when at the input of the satellite only Gaussian noise is added, while at the input of the earth station they assume both Gaussian noise and an interference approximated by the sum of n sinusoidal signals 相似文献
4.
Stojanovic MN Semova S Kolpashchikov D Macdonald J Morgan C Stefanovic D 《Journal of the American Chemical Society》2005,127(19):6914-6915
A complete set (YES, NOT, AND, and ANDNOT) of molecular scale logic gates based on ligase deoxyribozymes was constructed. The activity of these gates was visualized through the formation of cascades with downstream phosphodieseterase YES gates, which performed fluorogenic cleavage. 相似文献
5.
Ivana Petrovic Mihajlo Stefanovic Petar Spalevic Stefan R. Panic Dusan Stefanovic 《Telecommunication Systems》2013,52(1):39-50
In this paper an approach to the performance analysis of signal-to-interference (SIR) based selection combining (SC) operating over the Rayleigh fading channels experiencing an arbitrary number of multiple, Rayleigh co-channel interferers is presented. We have presented a general analysis of multibranch SC where each branch experiences an arbitrary number of multiple equal power co-channel interferers. Useful closed form expressions are derived for the probability density function (PDF) and cumulative distribution function (CDF) at the output of the combiner. Also an outage analysis is performed in order to show the effects of the number of multiple interferers, diversity order and input SIR unbalance to the system performances. 相似文献
6.
Milos Bandjur Nikola Sekulovic Mihajlo Stefanovic Aleksandra Golubovic Petar Spalevic Dejan Milic 《ETRI Journal》2013,35(4):722-725
In this letter, a wireless communication system with microdiversity and macrodiversity reception in gamma‐shadowed Rician fading channels is considered. Exact and rapidly converging infinite‐series expressions for the average level crossing rate and average fade duration at the output of the system are provided. Numerical results are presented graphically to illustrate the proposed mathematical analysis and to examine the effects of the system's parameters on the quantities considered. 相似文献
7.
Deoxyribozyme-based logic gates 总被引:14,自引:0,他引:14
Stojanovic MN Mitchell TE Stefanovic D 《Journal of the American Chemical Society》2002,124(14):3555-3561
We report herein a set of deoxyribozyme-based logic gates capable of generating any Boolean function. We construct basic NOT and AND gates, followed by the more complex XOR gate. These gates were constructed through a modular design that combines molecular beacon stem-loops with hammerhead-type deoxyribozymes. Importantly, as the gates have oligonucleotides as both inputs and output, they open the possibility of communication between various computation elements in solution. The operation of these gates is conveniently connected to a fluorescent readout. 相似文献
8.
The shape of a resulting pulse (coherent interference superimposed to Gaussian pulse) along the linear optical fiber is determined by using attained analytical expressions. These analytical expressions enable the investigation of the influence of arbitrary dispersion order on pulse propagation. Individual and joint influence of second- and third-order dispersion on the transmission quality is examined in this paper. Pulse shape, eye diagram and bit error rate (BER) are used to represent in the best manner the above-mentioned influences. 相似文献
9.
Sager J Young M Stefanovic D 《Langmuir : the ACS journal of surfaces and colloids》2006,22(9):4452-4455
We analyze mathematically a previously reported class of passive microfluidic mixing networks. The networks produce nonhomogeneous concentrations in the output channel, resulting in diverse concentration profiles. We formally prove that all profiles obtainable with this class of networks can be described as polynomials of degree no higher than the number of input channels less one. We derive explicit formulas for the calculation of resultant output concentration profiles and conversely for the calculation of input concentrations needed to obtain set output profiles. 相似文献
10.
Mihajlo C. Stefanovic Goran T. Djordjevic Ivan B. Djordjevic Nebojsa D. Stojanovic 《International Journal of Satellite Communications and Networking》1999,17(1):37-49
The purpose of this paper is to provide the theoretical approach for determining the bit error probability in detecting a coherent quaternary phase-shift-keyed signal transmitted over a soft-limited channel in the presence of the uplink and downlink noise, as well as the noisy carrier reference signal. The uplink noise is considered in the specific way through the envelope variations and the frequency offset of the signal remitted by the satellite station having influence on the variations of the phase-locked loop parameters in the receiving ground station, consequently on the probability density function of the phase error, i.e. the average bit error probability. The downlink noise is also taken into consideration. The determined results are based on the non-linear phase-locked loop model with primary emphasis on the degradations in the system performance produced by the imperfect carrier signal extraction. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献