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CHANNEL MODEL FOR SATELLITE COMMUNICATION LINKS ABOVE 10GHZ BASED ON WEIBULL DISTRIBUTION
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CHANNEL MODEL FOR SATELLITE COMMUNICATION LINKS ABOVE 10GHZ BASED ON WEIBULL DISTRIBUTION

Category : Communication


Sub Category : MIMO


Project Code : ITCM16


Project Abstract

Modern satellite communication networks will employ frequencies above 10GHz. At these frequency bands, rain attenuation is the dominant fading mechanism. In this paper, a novel channel model, a synthesizer for generating rain attenuation time series for satellite links operating at 10GHz and above is presented. The proposed channel model modifies Maseng- Bakken (M-B) model since it generates rain attenuation time series that follow the Weibull distribution. The new stochastic dynamic model is based on the first-order Stochastic Differential Equations (SDEs) and considers rain attenuation induced on a slant path as a Weibull-based stochastic process. Moreover, the theoretical expressions for the computation of the exceedance probability of hitting time random variable are presented. The hitting time statistics may be employed for the optimum design of Fade Mitigation Techniques (FMTs). The synthesizer is verified in terms of the exceedance probability and the theoretical CCDF of hitting time comparing to these derived from the simulations in the numerical results section.

EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING  CONCEPT:

·         A time series synthesizer is evaluated based on SDEs assuming that rain attenuation follows the lognormal distribution and that the rate of change of rain attenuation is proportional to the instantaneous value of rain attenuation.

PROPOSED CONCEPT:

·         By the application of SDEs it is shown that rain attenuation can be also described with the Weibull distribution. The basic assumptions are that first-order statistics of rain follow Weibull distribution and that the rate of change of rain attenuation is proportional to the instantaneous value of rain attenuation.

         Hitting time statistical properties have been used for the development of an analytical method for the calculation of the rain attenuation dynamic parameter

EXISTING TECHNIQUE :

·         Maseng- Bakken (M-B) model is used.

PROPOSED TECHNIQUE:

         Weibull distribution technique is used.

TECHNIQUE DEFINITION:

·         The long-term distribution of rain attenuation is log-normal, respectively the mean m and the standard deviation σ of its natural logarithm.

TECHNIQUE DEFINITION:

·         It was found that the RMS value of the relative error was 13.47% for Weibull distribution and 13.8% for lognormal distribution.

DRAWBACKS:

·         Rain attenuation is just assumed as lognormal distribution.

 

ADVANTAGES:

·         System is analytical.Gives much better prediction than other prediction models.


 
 
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