scholarly journals Performance of macro diversity wireless communication system operating in Weibull multipath fading environment

2017 ◽  
Vol 30 (4) ◽  
pp. 599-609
Author(s):  
Suad Suljovic ◽  
Dejan Milic ◽  
Zorica Nikolic ◽  
Stefan Panic ◽  
Mihajlo Stefanovic ◽  
...  
Keyword(s):  
Communication System ◽  
Output Signal ◽  
System Performance ◽  
Multipath Fading ◽  
Cumulative Distribution ◽  
Selection Combining ◽  
Small Scale ◽  
Weibull Fading ◽  
Fading Parameter ◽  
Severity Parameter

In this paper, we consider wireless mobile radio communication system with macro diversity reception. Signal is subject to Weibull small scale fading and Gamma large scale fading resulting in system performance degradation. Receiver uses macro diversity selection combining (SC) technique in order to reduce the impact of long term fading effects, and two micro diversity SC branches are used to mitigate Weibull short term fading effects on system performance. Probability density function (PDF), and cumulative distribution function (CDF), as well as level crossing rate (LCR) and average fade duration (AFD) of the SC receiver output signal envelope are evaluated. The obtained expressions converge rapidly for all considered values of Weibull fading parameter and Gamma shadowing severity parameter. Mathematical results are studied in order to analyze the influence of Weibull fading parameter and Gamma shadowing severity parameter on statistical properties of the SC receiver output signal.

New Results and Applications about the Level Crossing Rate of SC Receiver output Signal in the Presence of Gamma Shadowing and k-μ or Rician Multipath Fading

2021 ◽  
Vol 20 ◽  
pp. 118-127
Author(s):  
DRAGANA KRSTIĆ ◽  
SUAD SULJOVIĆ ◽  
MIHAJLO STEFANOVIĆ ◽  
MUNEER MASADEH BANI YASSEIN ◽  
DANIJELA ALEKSIĆ
Keyword(s):  
Output Signal ◽  
Joint Probability ◽  
Multipath Fading ◽  
Average Level ◽  
Rician Fading ◽  
Level Crossing ◽  
Multipath Fading Channel ◽  
Signal Envelope ◽  
Level Crossing Rate ◽  
Severity Parameter

In this paper,the wireless communication system with dual SC receiver operating over shadowed multipath fading channel is considered. The multipath fadingis k-μor Rician.The received signal experiences the short term fading which is resulting in SC receiver envelope variation and Gamma long term fading resulting in SC receiver envelope power variation. The closed form expressions for joint probability density functions of SC receiver output signal envelope and their first derivative of SC receiver output signal envelope are calculated for both, k-μand Rician fading. These expressions are used for evaluation of average level crossing rate of SC receiver output signal envelopes. The numerical expressions are plotted to show the effect of Rician fading severity parameter and Gamma shadowing severity parameter on the average level crossing rate of SC receiver output signal envelope.

scholarly journals Performance analysis of dual-branch selection diversity system using novel mathematical approach

2017 ◽  
Vol 30 (2) ◽  
pp. 235-244
Author(s):  
Aleksandra Golubovic ◽  
Nikola Sekulovic ◽  
Mihajlo Stefanovic ◽  
Dejan Milic
Keyword(s):  
Performance Analysis ◽  
Fading Channels ◽  
System Performance ◽  
Selection Combining ◽  
Mathematical Approach ◽  
Average Output ◽  
Weibull Fading ◽  
Average Bit Error Probability ◽  
Receiver Performance ◽  
Diversity Receiver

In this paper, novel mathematical approach for evaluation of probability density function (PDF) of instantaneous signal-to-interference ratio (SIR) at the receiver output in interference-limited environment is proposed. Dual-branch selection combining (SC) receiver operating over correlated Weibull fading channels applying SIR algorithm is considered. Analytical expression for joint PDF of desired signal and interference at the receiver output is derived and used for evaluation of PDF of instantaneous SIR. The expression for PDF of SIR is used for system performance analysis via outage probability, average bit error probability (ABEP) and average output SIR as system performance measures. Numerical results are graphically presented showing the effects of fading severity, average SIR at the input and level of correlation on the diversity receiver performance. In addition, results obtained for the PDF of instantaneous SIR in this paper, are compared to the results when the PDF of instantaneous SIR is directly calculated.

scholarly journals LEVEL CROSSING RATE OF MACRODIVERSITY OUTPUT PROCESS IN THE PRESENCE OF η-μ SHORT TERM FADING AND GAMMA LONG TERM FADING

2017 ◽  
Vol 16 (2) ◽  
pp. 157
Author(s):  
Srđan Milosavljević ◽  
Dejan Milić ◽  
Slaviša Trajković ◽  
Petar Spalević ◽  
Bojana Milosavljević
Keyword(s):  
Multipath Fading ◽  
Selection Combining ◽  
Output Process ◽  
Level Crossing ◽  
Short Term ◽  
Signal Process ◽  
Multipath Fading Channel ◽  
Level Crossing Rate ◽  
Severity Parameter

In this paper macrodiversity reception with macrodiversity selection combining (SC) receiver and two microdiversity MRC receivers operating over shadowed multipath fading channel is studied. Received signal experiences  short term fading and correlated Gamma long term fading resulting in system performance degradation. Level crossing rate (LCR) of η-μ random process and level crossing rate of signals at outputs of microdiversity MRC receivers are efficiently calculated. By using these derived formulas, level crossing rate of macrodiversity SC receiver output signal process is calculated. By using this result, average fade duration (AFD) of the proposed wireless communication system can be calculated. The influence of  η-μ  short term fading severity parameter, Gamma long term fading severity parameter and Gamma long term correlation coefficient on level crossing rate is analysed and studied.

scholarly journals LCR of SC receiver output signal over α-κ-μ multipath fading channels

2016 ◽  
Vol 29 (2) ◽  
pp. 261-268 ◽  
Author(s):  
Suad Suljovic ◽  
Dejan Milic ◽  
Stefan Panic
Keyword(s):  
Fading Channels ◽  
Output Signal ◽  
Multipath Fading ◽  
Selection Combining ◽  
Multipath Fading Channels ◽  
Signal Envelope ◽  
Transmission Parameters ◽  
Dominant Component ◽  
Level Crossing Rate ◽  
Wireless Mobile Communication

Wireless mobile communication system with selection combining (SC) diversity receiver is investigated in this paper. Received signal envelope experiences ?-?-? short term fading resulting in system performance degradation. Level crossing rate (LCR) and average fade duration (AFD) of SC receiver output signal envelope are obtained as rapidly converging infinite series expressions. Numerically evaluated results are presented graphically, in order to discuss the effects of transmission parameters: multipath fading severity, dominant component power and nonlinearity propagation parameter on observed LCR performance of dual SC.

scholarly journals Performance analysis of system with triple selection combining over correlated Weibull fading channel in the presence of cochannel interference

2010 ◽  
Vol 23 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Petar Spalevic ◽  
Nikola Sekulovic ◽  
Georgios Zachos
Keyword(s):  
Fading Channels ◽  
Cochannel Interference ◽  
Cumulative Distribution ◽  
Performance Criteria ◽  
Selection Combining ◽  
Wireless System ◽  
Average Output ◽  
Weibull Fading ◽  
Average Bit Error Probability ◽  
Correlated Weibull Fading

In this paper, closed-form expressions for probability density function (PDF) and cumulative distribution function (CDF) of the signal-to-interference ratio (SIR) at the output of the triple selection combining (SC) receiver over correlated Weibull fading channels in the presence of correlated cochannel interference (CCI) are derived. These expressions are used to study wireless system performance criteria, such as outage probability, average bit error probability and average output SIR. .

scholarly journals Efficient Numerical Methods for Analysis of Square Ratio of κ-μ and η-μ Random Processes with Their Applications in Telecommunications

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Gradimir V. Milovanović ◽  
Suad Suljović ◽  
Stefan R. Panić ◽  
Ismet Kalčo ◽  
Mihajlo Č. Stefanović
Keyword(s):  
Multipath Fading ◽  
Computational Procedure ◽  
Random Processes ◽  
Cumulative Distribution ◽  
Performance Criteria ◽  
Selection Combining ◽  
Weight Functions ◽  
Quadrature Formulas ◽  
Transmission Parameters ◽  
Probability Density Function Pdf

We will provide statistical analysis of the square ratio of κ-μ and η-μ random processes and its application in the signal-to-interference ratio (SIR) based performance analysis of wireless transmission subjected to the influence of multipath fading, modelled by κ-μ fading model, and undesired occurrence of co-channel interference (CCI), distributed as η-μ random process. First contribution of the paper is deriving exact closed expressions for the probability density function (PDF) and cumulative distribution function (CDF) of square ratio of κ-μ and η-μ random processes. Further, a verification of accuracy of these PDF and CDF expressions was given by comparison with the corresponding approximations obtained by the high-precision quadrature formulas of Gaussian type with respect to the weight functions on (0,+∞). The computational procedure of such quadrature rules is provided by using the constructive theory of orthogonal polynomials and the MATHEMATICA package OrthogonalPolynomials created by Cvetković and Milovanović (2004). Capitalizing on obtained expression, important wireless performance criteria, namely, outage probability (OP), have been obtained, as functions of transmission parameters. Also, possible performance improvement is observed through a glance at SC (selection combining) reception employment based on obtained expressions.

scholarly journals Moments Of Microdiversity EGC Receivers And Macrodiversity SC Receiver Output Signal Over Gamma Shadowed Nakagami–m Multipath Fading Channel

2015 ◽  
Vol 66 (6) ◽  
pp. 348-351
Author(s):  
Nebojša Djordjević ◽  
Branimir S. Jaksić ◽  
Ana Matović ◽  
Marija Matović ◽  
Marko Smilić
Keyword(s):  
Closed Form ◽  
Output Signal ◽  
Fading Channel ◽  
Multipath Fading ◽  
Selection Combining ◽  
Signal Power ◽  
Equal Gain Combining ◽  
Multipath Fading Channel ◽  
Signal Envelope ◽  
System Output

Abstract A system with macrodiversity selection combining (SC) receiver and for microdiversity equal gain combining (EGC) receivers is considered. Received signal is subjected, simultaneously to multipath fading and shadowing, resulting in signal envelope and signal power variation. Closed form expressions for moments of macrodiversity SC receiver output signal envelope are calculated. Numerical expressions are plotted to present the influences of Gamma shadowing severity and Nakagami-m severity on moments of proposed system output signal.

scholarly journals Performance Analysis of MIMO STBC System in Flat Fading and Frequency Selective Fading Channels

2019 ◽  
Vol 3 (1) ◽  
pp. 19
Author(s):  
Pebri Yeni Samosir ◽  
Nyoman Pramaita ◽  
I Gst A. Komang Diafari Djuni Hartawan ◽  
Ni Made Ary Esta Dewi Wirastuti
Keyword(s):  
Fading Channels ◽  
System Performance ◽  
Mimo System ◽  
Multipath Fading ◽  
Delay Spread ◽  
Selective Fading ◽  
Frequency Selective Fading ◽  
Flat Fading ◽  
Frequency Selective ◽  
Frequency Selective Fading Channels

Multiple Input Multiple Output (MIMO) technology is a technique that can be used to overcome multipath fading. The multipath fading is caused by signals coming from several paths that experience different attenuations, delays and phases. In a multipath condition, an impulse that sent by the transmitter, will be received by the recipient not as an impulse but as a pulse with a spread width that called delay spread. Delay spread can cause intersymbol interference (ISI) and bit translation errors from the information received. To determine the effect of delay spread on the MIMO system, then MIMO system performance research was performed on flat fading and frequency selective fading channels using the Space Time Block Code (STBC) coding technique. This research was conducted using MatLab 2018a software. The simulation results show that the MIMO STBC system performance on flat fading channels is better than the MIMO STBC system performance on the frequency selective fading channel. This result is analyzed based on the value of BER vs. Eb/No and eye diagram.

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