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.

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 Second order statistics of SC receiver over k-μ multipath fading channel

2014 ◽  
Vol 11 (3) ◽  
pp. 391-401 ◽  
Author(s):  
Milos Bandjur ◽  
Dragan Radenkovic ◽  
Vladeta Milenkovic ◽  
Suad Suljevic ◽  
Danijel Djosic
Keyword(s):  
Fading Channel ◽  
Multipath Fading ◽  
Average Level ◽  
Selection Combining ◽  
Level Crossing ◽  
Multipath Fading Channel ◽  
Second Order Statistics ◽  
Level Crossing Rate ◽  
Diversity Receiver ◽  
Average Fade Duration

In this paper wireless communication system with dual branch selection combining (SC) diversity receiver operating over k-? multipath fading environment is considered. Closed form expressions for average level crossing rate of SC receiver output signal envelope and average fade duration of proposed system are evaluated. Numerical results are presented graphically to show the influence of Rican factor k and fading severity ? on average level crossing rate and average fade duration.

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.

scholarly journals Level Crossing Rate of Macrodiversity System in the Presence of Multipath Fading and Shadowing

2015 ◽  
Vol 24 (1) ◽  
pp. 185-191 ◽  
Author(s):  
B. Jaksic ◽  
D. Stefanovic ◽  
M. Stefanovic ◽  
P. Spalevic ◽  
V. Milenkovic
Keyword(s):  
Multipath Fading ◽  
Level Crossing ◽  
Level Crossing Rate ◽  
Fading And Shadowing
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