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//Variable Declaration
alpha=1.9 //Rain attenuation(dB)
CNR=20 //Downlink carrier to noise ratio(dB)
Tn=400 //Effective Noise temperature(Kelvin)
Ta=280 //Reference temperature(Kelvin)
//Calculation
alpha1=10**(alpha/10) //Converting alpha to ratio
Trn=Ta*(1-1/alpha1) //Equivalent noise temperature of rain(kelvin)
Ts=Tn+Trn //New system noise temperature
delp=10*log10(Ts/Tn) //Decibel increase in noise power
CNRN=CNR-delp-alpha //Value below which CNR falls(dB)
//Result
printf("The value below which C/N falls for 0.1 percent of time is %.2f dB",CNRN)
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