Performance analysis of switched-and-stay combining (SSC) and selection combining (SC) diversity receivers operating over correlated Nakagami-m fading channels in the presence correlated Nakagami-m distributed co-channel interference... more
Performance analysis of switched-and-stay combining (SSC) and selection combining (SC) diversity receivers operating over correlated Nakagami-m fading channels in the presence correlated Nakagami-m distributed co-channel interference (CCI) is presented. Novel infinite series expressions are derived for the output signal to interference ratio's (SIR's) probability density function (PDF) and cumulative distribution function (CDF). Capitalizing on them standard performance merasures criterion like outage probabilty (OP) and average bit error probability (ABEP) for modulation schemes such as noncoherent frequency-shift keying (NCFSK) and binary differentially phase-shift keying (BDPSK) are efficiently evaluated. In order to point out the effects of fading severity and the level of correlation on the system performances, numericaly obtained results, are graphically presented and analyzed.
У овом раду приказана је примена едукативних игара у електронском учењу као тренутни и будући правац у образовању. Савремену методику наставе карактерише забава и дух такмичења који се кроз графику високог квалитета све више и више... more
У овом раду приказана је примена едукативних игара у електронском учењу као тренутни и будући правац у образовању. Савремену методику наставе карактерише забава и дух такмичења који се кроз графику високог квалитета све више и више приближава студенту. Утицај нових технологија и медија условио је развој едукативних игра као ефикасног наставног материјала за учење данашње Интернет генерације студената. Кључне речи: едукативне игре, забавно учење, концептуалне мапе, MIMLE, Second Life
Macrodiversity reception containing of macrodiversity selection combining (SC) receiver and two microdiversity SC receivers in the presence of short term fading, long term fading and co-channel interference is considered in this article.... more
Macrodiversity reception containing of macrodiversity selection combining (SC) receiver and two microdiversity SC receivers in the presence of short term fading, long term fading and co-channel interference is considered in this article. Desired signal experiences Weibull short term fading, correlated Gamma long term fading and co-channel interference experiences α-κ-μ short term fading and correlated Gamma long term fading. In this article, probability density function and cumulative distribution function of Weibull random process and α-κ-μ random process ratio are evaluated. Theses expressions are used for evaluation cumulative distribution function of signal to interference ratio at outputs of microdiversity SC receivers and cumulative distribution function of macrodiversity SC receiver output signal to interference ratio. Outage probability can be evaluated from cumulative distribution function. The influence of Weibull short term fading nonlinearity parameter, ακ-μ short term f...
Performance analysis of switched-and-stay combining (SSC) and selection combining (SC) diversity receivers operating over correlated Nakagami-m fading channels in the presence correlated Nakagami-m distributed co-channel interference... more
Performance analysis of switched-and-stay combining (SSC) and selection combining (SC) diversity receivers operating over correlated Nakagami-m fading channels in the presence correlated Nakagami-m distributed co-channel interference (CCI) is presented. Novel infinite series expressions are derived for the output signal to interference ratio's (SIR's) probability density function (PDF) and cumulative distribution function (CDF). Capitalizing on them standard performance merasures criterion like outage probabilty (OP) and average bit error probability (ABEP) for modulation schemes such as noncoherent frequency-shift keying (NCFSK) and binary differentially phase-shift keying (BDPSK) are efficiently evaluated. In order to point out the effects of fading severity and the level of correlation on the system performances, numericaly obtained results, are graphically presented and analyzed.
An output signal from a multi-section wireless relay communication system is equal to the product of the signal envelopes from individual sections. In this paper, a three-sections relay system is considered in the presence of Nakagami-m... more
An output signal from a multi-section wireless relay communication system is equal to the product of the signal envelopes from individual sections. In this paper, a three-sections relay system is considered in the presence of Nakagami-m fading at each section. First, random variable (RV) is formed as the product of three Nakagami-m RVs. For such product, the moments are determined in the closed forms. The first moment is the mean of the signal; the second moment is the average power of the signal, and the third moment is skewness. Then, the Amount of Fading (AoF) is calculated. AoF is a measure of the severity effect of fading in a particular channel model. Besides, all system performance are shown graphically and the parameters influence has been analyzed and discussed.
In this paper, the wireless system consisting of macrodiversity selection combining (SC) receiver and two microdiversity SC receivers under the influence of small scale fading and large scale fading, as well as co-channel interference is... more
In this paper, the wireless system consisting of macrodiversity selection combining (SC) receiver and two microdiversity SC receivers under the influence of small scale fading and large scale fading, as well as co-channel interference is observed. Small scale fading has Weibull distribution. Correlated large scale fading is described by Gamma distribution. Co-channel interference is disturbed by α-κ-μ fading and Gamma large scale fading. Probability density function (PDF) and cumulative distribution function (CDF) of the ratio of Weibull random variable and α-κ-μ random variable are given. The formula for CDF of macrodiversity SC receiver output signal to interference ratio (SIR) is also presented. Level crossing rates at the outputs of microdiversity SC receivers are determined. Then, the level crossing rate (LCR) of wireless system output signal to interference ratio is derived and shown in some figures. Based on them, the influence of Weibull fading nonlinearity parameter, α-κ-μ ...
In this paper, the performance of macrodiversity system with macrodiversity selection reception and two microdiversity maximum ratio combining (MRC) receivers are derived. In the first microdiversity receiver, received signal suffers... more
In this paper, the performance of macrodiversity system with macrodiversity selection reception and two microdiversity maximum ratio combining (MRC) receivers are derived. In the first microdiversity receiver, received signal suffers correlated Gamma long term fading and Rayleigh short term fading, and in the second microdiversity receiver, received signal experiences correlated Gamma long term fading and κ-μ short term fading. Macrodiversity (MAD) receiver is of selection combining (SC) type and it mitigates Gamma long term fading effects; the first microdiversity (MID) MRC receiver reduces Rayleigh short term fading effects and the second one eliminates κ-μ short term fading effects on system performance. Cumulative distribution functions (CDF) and level crossing rates of signals at outputs of MID receivers are determined. Based on them, the level crossing rate (LCR) of MAD Selection Combining (SC) receiver output signal is calculated. Some figures are presented to show the influe...
In this paper, the ratio of product of two Rayleigh random variables and Rayleigh random variable (RV) is considered. The level crossing rate (LCR) of ratio of product of two Rayleigh random variables and Rayleigh random variable is... more
In this paper, the ratio of product of two Rayleigh random variables and Rayleigh random variable (RV) is considered. The level crossing rate (LCR) of ratio of product of two Rayleigh random variables and Rayleigh random variable is evaluated. Using this result, the average fade duration (AFD) of wireless relay communication system with two sections operating over multipath fading channel in the presence of co-channel interference can be calculated. Then, the LCR of the ratio of Rayleigh RV and product of two Rayleigh RVs is determined. The formula is obtained in the closed form. The influence of Rayleigh fading average power on the LCR is analyzed. By using this formula, the AFD of wireless relay system with two sections working over Rayleigh multipath fading channel in the presence of two Rayleigh co-channel interferences could be evaluated.
Macrodiversity (MAD) with MAD selection combining (SC) receiver and two microdiversity (MID) maximum ratio combining (MRC) receivers is considered in this paper. Received signal in the first MRC receiver experiences Gamma long term fading... more
Macrodiversity (MAD) with MAD selection combining (SC) receiver and two microdiversity (MID) maximum ratio combining (MRC) receivers is considered in this paper. Received signal in the first MRC receiver experiences Gamma long term fading and κ-μ short term fading and received signal in the second MRC receiver experiences correlated Gamma long term fading and Rayleigh short term fading. MAD SC receiver reduces Gamma long term fading effects, the first MID MRC receiver reduces κ-μ short term fading effects and the second MID MRC receiver reduces Rayleigh short term fading effects on system performance. The closed form expressions for level crossing rate of signal envelopes at outputs of MID MRC receivers are calculated. These expressions are used for evaluation the level crossing rate of MAD SC receiver output signal envelope. The influence of Rician factor of κ-μ short term fading, κ-μ short term fading severity parameter, Gamma long term fading severity parameter and Gamma long ter...
Macrodiversity (MAD) with MAD selection combining (SC) receiver and two microdiversity (MID) maximum ratio combining (MRC) receivers is considered in this paper. Received signal in the first MRC receiver experiences Gamma long term fading... more
Macrodiversity (MAD) with MAD selection combining (SC) receiver and two microdiversity (MID) maximum ratio combining (MRC) receivers is considered in this paper. Received signal in the first MRC receiver experiences Gamma long term fading and κ-μ short term fading and received signal in the second MRC receiver experiences correlated Gamma long term fading and Rayleigh short term fading. MAD SC receiver reduces Gamma long term fading effects, the first MID MRC receiver reduces κ-μ short term fading effects and the second MID MRC receiver reduces Rayleigh short term fading effects on system performance. The closed form expressions for level crossing rate of signal envelopes at outputs of MID MRC receivers are calculated. These expressions are used for evaluation the level crossing rate of MAD SC receiver output signal envelope. The influence of Rician factor of κ-μ short term fading, κ-μ short term fading severity parameter, Gamma long term fading severity parameter and Gamma long ter...
