scholarly journals A practical method for estimating the headway distribution based on the observed data of the number of flowing vehicles - Gamma distribution model.

1989 ◽  
Vol 10 (6) ◽  
pp. 357-361
Author(s):  
Yuichi Kato ◽  
Shizuma Yamaguchi
Keyword(s):  
Gamma Distribution ◽  
Practical Method ◽  
Distribution Model ◽  
Headway Distribution

scholarly journals Bit Error Rate Analysis of Different Modulation Schemes in Free Space Optics Link using Gamma-Gamma Turbulence Model

2019 ◽  
Vol 8 (4) ◽  
pp. 8292-8295
Keyword(s):  
Phase Shift ◽  
Gamma Distribution ◽  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Channel Model ◽  
Distribution Model ◽  
Phase Shift Keying ◽  
Free Space Optical ◽  
Shift Keying

Free Space Optical (FSO) link using gamma-gamma channel model has been studied in this paper. Comparison of the probability density function of gamma-gamma distribution under weak and strong turbulence regime has been performed. Performance of Bit error rate (BER) using different subcarrier-intensity modulation (SIM) schemes such as binary phase shift keying (BPSK), M-ary phase shift keying (M-PSK) and quadrature amplitude modulation (QAM) have been also investigated. Using MATLAB software, the BER is plotted with respect to normalized signal to noise ratio (SNR) and the link distance. All the analysis has been done using the Gamma-Gamma distribution model. In this work we found that the effectiveness of each modulation technique depends on the environment.

Gill-net mesh selectivities for two species of commercial carcharhinid shark taken in northern Australia

1994 ◽  
Vol 45 (4) ◽  
pp. 521 ◽  
Author(s):  
KJ McLoughlin ◽  
JD Stevens
Keyword(s):  
Gamma Distribution ◽  
Distribution Model ◽  
Northern Australia ◽  
Gill Net ◽  
Commercially Important

Experiments designed to estimate gill-net mesh selectivities for two species of commercially important sharks in northern Australia were carried out between 1983 and 1984. A gamma distribution model was used to obtain length-specific selectivities for Carcharhinus tilstoni and C. sorrah caught in nets with stretched-mesh sizes of 10, 15, 20 and 25 cm. Captured sharks were categorized as gilled or rolled (tangled) in the nets. The model provided a better fit to the data for C. sorrah than for C. tilstoni.

Study and Simulation on Turbulent Atmosphere Modeled by Gamma-Gamma Distributions

2013 ◽  
Vol 760-762 ◽  
pp. 204-208
Author(s):  
Jun Ao ◽  
Yun Zhi Xia ◽  
Long Che ◽  
Tao Zhang ◽  
Chun Bo Ma
Keyword(s):  
Gamma Distribution ◽  
Communication Systems ◽  
Structure Constant ◽  
Distribution Model ◽  
Turbulence Structure ◽  
Free Space Optical ◽  
Gamma Distributions ◽  
Optical Communication Systems ◽  
Space Optical Communication ◽  
The Impact

Gamma-Gamma distribution model is widely used in studying the impact of the atmospheric turbulence on the Free Space Optical communication systems. This study introduces the Gamma-Gamma distribution model, simulates and studies the spot changes over distance, wavelength, turbulence structure constant and transmit aperture, respectively. Finally, the simulation results show that the Gamma-Gamma distribution is more suitable for middle-strong turbulence than weak turbulence.

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