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// Exa 8.1
// To calculate coverage gain in dB.
clc;
clear all;
Pdiff=-3; //in dB
AMR1=12.2; //in kbps
AMR2=7.95; //in kbps
AMR3=4.75; //in kbps
//solution
//CG(dB)=10log{(DPDCH(kbps)+DPCCH)/(DPDCH(AMR bit rate (kbps))+ DPCCH)}
CG1=10*log10((AMR1+AMR1*10^(Pdiff/10))/(AMR2+AMR1*10^(Pdiff/10)));
CG2=10*log10((AMR1+AMR1*10^(Pdiff/10))/(AMR3+AMR1*10^(Pdiff/10)));
printf('By reducing the AMR bit rate from 12.2 to 7.95 kbps coverage gain becomes %.2f dB \n ',CG1);
printf('By reducing the AMR bit rate from 7.95 to 4.75 kbps coverage gain becomes %.2f dB \n ',CG2);
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