Sunday, May 29, 2011

Matlab code for Satellite link design


CODING
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')
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 dBW\n',c1);

cn0=c1+gte-(10*log10(1.38*(10^(-23))));
fprintf('C/No at the satellite = %f dB\n',cn0);

ebn0=cn0-(10*log10(br));
fprintf('Eb/No : = %f dB\n',ebn0);

cn=ebn0-10*(log10((40*(10^6))/(br)));
fprintf('for a minimum bandwidth system, C/N = %f dB\n',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 dBW\n',c12);

cn02=c12+gte2-(10*log10(1.38*(10^(-23))));
fprintf('C/No at the earth station receiver = %f dB\n',cn02);

ebn02=cn02-(10*log10(br2));
fprintf('Eb/No : = %f dB\n',ebn02);

cn2=ebn02-10*(log10((40*(10^6))/(br2)));
fprintf('for a minimum bandwidth system, C/N = %f dB\n',cn2);

a=10^(ebn0/10);
b=10^(ebn02/10);
ebn0all=(a*b)/(a+b);
ebn02db=10*log10(ebn0all);
fprintf('Eb/No(overall) : = %f dB\n',ebn02db);



 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
>> 
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