نتایج جستجو برای: rayleigh distribution

تعداد نتایج: 621841  

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2009
Miguel Escobedo Manuel A Valle

We study the four-wave kinetic equation of weak turbulence linearized around the Rayleigh-Jeans spectrum when the collision integral is associated with short-range interactions between nonrelativistic bosonic quasiparticles. The technique used for the analysis of the stability is based on the properties of the Mellin transform of the kernel in the integral equation. We find that any perturbatio...

2011
Yurong He Cong Qi Yanwei Hu Bin Qin Fengchen Li Yulong Ding

A lattice Boltzmann model is developed by coupling the density (D2Q9) and the temperature distribution functions with 9-speed to simulate the convection heat transfer utilizing Al2O3-water nanofluids in a square cavity. This model is validated by comparing numerical simulation and experimental results over a wide range of Rayleigh numbers. Numerical results show a satisfactory agreement between...

In this paper, an exact analytical solution for free vibration of rotating bi-layered cylindrical shell composed of two independent functionally graded layers was presented. The thicknesses of the shell layers were assumed to be equal and constant. The material properties of the constituents of bi-layered FGM cylindrical shell were graded in the thickness direction of the layers of the shell ac...

ژورنال: پژوهش های ریاضی 2018

Introduction      In classical methods of statistics, the parameter of interest is estimated based on a random sample using natural estimators such as maximum likelihood or unbiased estimators (sample information). In practice,  the researcher has a prior information about the parameter in the form of a point guess value. Information in the guess value is called as nonsample information. Thomp...

Journal: :Int. J. Communication Systems 2011
Aniruddha Chandra Chayanika Bose Manas Kr. Bose

Following a unified analytical framework, the bit error rate (BER) of several coherent and non-coherent binary modulation schemes are derived for a switched diversity system. The two variants of switched combining (SWC) that have been investigated are switch and stay combining (SSC) and switch and examine combining (SEC). For channel modelling, at first a simple slow flat fading channel is assu...

2012
VETRISELVAM GOPAL Vetriselvam Gopal Ehsan Taghavi

Real-time fading channels are affected by multipath fading as well as shadowing. In this thesis, we propose the Inverse-Gaussian distribution as a less complex alternative to the classical Log-normal model to describe shadowing effects in composite multipath fading/shadowing environments and to get closed-form solutions for the most important figures of merit. A main motivation for this selecti...

2004
David B. Smith Thushara D. Abhayapala Tim Aubrey

This paper extends a recently proposed space-time model for Rayleigh fading to include an arbitrary transmit antenna configuration of any shape and size transmitting simultaneously in a multiple-input multiple-output (MIMO) channel. The space-time correlation function and space-frequency cross spectrum function for a non-isotropic scatterer distribution around the receiver is derived for the ar...

2013
Bilal Shoaib I. M. Qureshi Ihsan ul Haq

This study presents a square root version of extended kernel recursive least square algorithm. Basically main idea is to overcome the divergence phenomena arise in the computation of weights of the extended kernel recursive least squares algorithm. Numerically stable givens orthogonal transformations are used to obtain the next iteration of the algorithm. The usefulness of the proposed algorith...

1999
FRANK LAUE

This paper describes a procedure for the design of fast simulation models for Rayleigh fading channels. The presented method is based on an eecient implementation of Rice's sum of sinusoids by using table look-up techniques. The proposed channel simulator is composed of a few number of adders, storage elements, and simple modulo operators, whereas time-consuming operations like multiplications ...

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