matlab code for satellite link budget calculation

1. EX NO 6 Simulation of satellite link budget analysis
AIM
To simulate satellite link budget using MATLAB
APPARATUS REQUIRED
MATLAB software, PC
SOURCE CODE:
clear all;
clc;
disp('ENTER UPLINK PARAMETERS')
disp('---------------------------------------')
pt=input('Earth station Transmitter output power :');
lbo=input('Earth Station back-off loss : ');
lbf=input('Earth station branching and feeder losses :');
at=input('Earth station Transmit antenna gain : ');
lu=input('Additional uplink atmospheric losses : ');
lp=input('Free-space path loss : ');
gte=input('Satellite receiver G/Te ratio : ');
bfb=input('Satellite branching and feeder losses : ');
br=input('Bit rate : ');
disp('---------------------------------------')
disp('ENTER DOWNLINK PARAMETERS')
disp('---------------------------------------')
disp('')
pt2=input('Satellite transmitter output power :');
lbo2=input('Satellite back-off loss : ');
lbf2=input('Satellite branching and feeder losses :');
at2=input('Satellite Transmit antenna gain : ');
ld=input('Additional downlink atmospheric losses : ');
lp2=input('Free-space path loss : ');
gte2=input('Earth station receiver G/Te ratio : ');
bfb2=input('Earth station branching and feeder losses : ');
br2=input('Bit rate : ');
disp('---------------------------------------')
EIRP=pt+at-lbo-lbf;
disp('UPLINK BUDGET')

2. disp('---------------------------------------')
%EIRP (Earth Station)
fprintf('EIRP (Earth Station) = %f dBW n',EIRP);
c1=EIRP-lp-lu;
%Carrier power density at the satellite antenna :
fprintf('Carrier power density at the satellite antenna = %f dBWn',c1);
cn0=c1+gte-(10*log10(1.38*(10^(-23))));
fprintf('C/No at the satellite = %f dBn',cn0);
ebn0=cn0-(10*log10(br));
fprintf('Eb/No : = %f dBn',ebn0);
cn=ebn0-10*(log10((40*(10^6))/(br)));
fprintf('for a minimum bandwidth system, C/N = %f dBn',cn);
disp('---------------------------------------')
disp('DOWNLINK BUDGET')
disp('---------------------------------------')
%EIRP (satellite transponder)
EIRP2=pt2+at2-lbo2-lbf2;
fprintf('EIRP (satellite transponder) = %f dBW n',EIRP2);
c12=EIRP2-lp2-ld;
%Carrier power density at the earth station antenna :
fprintf('Carrier power density at earth station antenna = %f dBWn',c12);
cn02=c12+gte2-(10*log10(1.38*(10^(-23))));
fprintf('C/No at the earth station receiver = %f dBn',cn02);
ebn02=cn02-(10*log10(br2));
fprintf('Eb/No : = %f dBn',ebn02);
cn2=ebn02-10*(log10((40*(10^6))/(br2)));
fprintf('for a minimum bandwidth system, C/N = %f dBn',cn2);
a=10^(ebn0/10);
b=10^(ebn02/10);
ebn0all=(a*b)/(a+b);
ebn02db=10*log10(ebn0all);
fprintf('Eb/No(overall) : = %f dBn',ebn02db);

3. SAMPLE INPUT
ENTER UPLINK PARAMETERS
---------------------------------------
Earth station Transmitter output power :33
Earth Station back-off loss : 3
Earth station branching and feeder losses :4
Earth station Transmit antenna gain : 64
Additional uplink atmospheric losses : .6
Free-space path loss : 206.5
Satellite receiver G/Te ratio : -5.3
Satellite branching and feeder losses : 0
Bit rate : 120*(10^6)
---------------------------------------
ENTER DOWNLINK PARAMETERS
---------------------------------------
Satellite transmitter output power :10
Satellite back-off loss : .1
Satellite branching and feeder losses :.5
Satellite Transmit antenna gain : 30.8
Additional downlink atmospheric losses : .4
Free-space path loss : 205.6
Earth station receiver G/Te ratio : 37.7
Earth station branching and feeder losses : 0
Bit rate : 120*(10^6)
OUTPUT
---------------------------------------
UPLINK BUDGET
---------------------------------------
EIRP (Earth Station) = 90.000000 dBW
Carrier power density at the satellite antenna = -117.100000 dBW
C/No at the satellite = 106.201209 dB
Eb/No : = 25.409397 dB
for a minimum bandwidth system, C/N = 30.180609 dB
---------------------------------------
DOWNLINK BUDGET
---------------------------------------
EIRP (satellite transponder) = 40.200000 dBW
Carrier power density at earth station antenna = -165.800000 dBW
C/No at the earth station receiver = 100.501209 dB
Eb/No : = 19.709397 dB
for a minimum bandwidth system, C/N = 24.480609 dB
Eb/No(overall) : = 18.674255 dB