pls its urgent. who can solve it, using matlab. i need the source code. thanks.......

[ericiland]

use matlab to plot the graph of the received power as a function of distance between transmitter and receiver, use simplified free space pathloss (including antenna gains) choose two different carrier frequency and disscus the obtained graph. set all parameters in a reasonable way.


question2: use matlab to illustrate the outage probability due to the combine effect of pathloss and shadowing, set the necessary parameters, including the minimum requried received power in a resonable way. plot the graph of the outage probability as a function of the varing distance between the tansmitter and receiver.

 

[milind.a.kulkarni]

In order to do this all you need to have relation of the transmitter and receiver, path loss, distance and carrier frequency ( mathematical models) then one can do the loop based coding for obtaining the result and those can be plotted

 

[ericiland]

this is the relationship of pathloss with receiver, tranmitter and gain
PL dB = 10 log10
Pt/
Pr
= −10 log10
Glλ2/
(4πd)2 .

G1=1
pr=100
pt=140

---------- Post added at 18:19 ---------- Previous post was at 18:17 ----------

d=4000..............................................................

 

[milind.a.kulkarni]

Hi
relation ships are not clear ......

please state variable and relation properly

with regards,

Milind

 

[errakeshpillai]

use matlab to plot the graph of the received power as a function of distance between transmitter and receiver, use simplified free space pathloss (including antenna gains) choose two different carrier frequency and disscus the obtained graph. set all parameters in a reasonable way.


question2: use matlab to illustrate the outage probability due to the combine effect of pathloss and shadowing, set the necessary parameters, including the minimum requried received power in a resonable way. plot the graph of the outage probability as a function of the varing distance between the tansmitter and receiver.

I have a MATLAB sorce code for Free Space Propagation Model...
See if this can help u..

clear all;
close all;
clc;
disp('The Free Space Propagation Model.');
Gt = input('Enter transmitter antenna gain:- ');
Gr = input('Enter receiver antenna gain:- ');
f = input('Enter the operating frequency:- ');
l = 300 / f;
d = 50:50:2000;

Pl1 = (Gt * Gr * l^2) / ((4 * pi)^2);
for i = 1:40
Pl(i) = -10 * log10(Pl1/d(i)^2);
end

plot(d,Pl,'-*r');
title('The Free Space Propagation Model');
xlabel('T-R seperation(in meters)----->');
ylabel('Path Loss(dB)------>');

I cannot get to design according to your demand because of my xams...

 

[milind.a.kulkarni]

I think you can modifiy your code to get two frequency input and get the Pathloss parameter computed

I had attempted to modify the code given by errakeshpillai ....get a look at it.....May be it will be helpful to you


clear all;
close all;
clc;
disp('The Free Space Propagation Model.');
Gt = input('Enter transmitter antenna gain:- ');
Gr = input('Enter receiver antenna gain:- ');
f = input('Enter the first operating frequency:- ');
f1 = input('Enter the second operating frequency:- ');
l = 300 / f;
l1 = 300 / f1;
d = 50:50:2000;

Pl1 = (Gt * Gr * l^2) / ((4 * pi)^2);
Pl2 = (Gt * Gr * l1^2) / ((4 * pi)^2);
for i = 1:40
Pl(i) = -10 * log10(Pl1/d(i)^2);
Pl1(i) = -10 * log10(Pl2/d(i)^2);
end

plot(d,Pl,'-*r',d,Pl1,'-*b');
title('The Free Space Propagation Model');
xlabel('T-R seperation(in meters)----->');
ylabel('Path Loss(dB)------>');


with regards,

Milind

 

[errakeshpillai]

That means the addition is just one more frequency at which the communication is done...
I think then this might work.....

 

[ericiland]

thanks for yr solutions......its really helpfull. this is the received power

Pr dBm = Pt dBm +10 log10(Gl) + 20 log10(λ) − 20 log10(4π) − 20 log10(d ) where landa(λ) = c/f. f is frequency, c is speed of light. can you run it on a matlab to generate the source code. in other to plot a graph of received power pr over distance d. thanks once more.

 

[ericiland]

thanks every one, yr replies has been very helpful..............do any body have any idea on the outage probability

 

[errakeshpillai]

No..
I don't have any idea about outage probability, but will surely like to know something about it....

 

[ericiland]

this is the computation of outage probability on matlab


clear all
clc
clf

%Definition of constant

%path loss exponent lambdaa = [2 8]
lambda=3;

%Distance d0=1
d0=1;

%Distance between transmites and receiver
d=[10:0.001:200];

%Constant c=1àlog(K)
c=-31.54;

%Transmited powe pt =[10 100] in dBm
pt=[10:20:90];

%Variance var=sqrt([8 12])
var=3;

%Minimum power pmin=[-500 -100]
pmin=-100;

for i=1:5
%Calculation of z

z=(pmin-(pt(i)+c-10*lambda*log(d/d0)))/(var);

%Calculation of Q

q=0.5*erfc(z/sqrt(2));

%Calculation of the probability
pro=1-q;

%Output
hold on;
xlabel('Distance')
ylabel('Outage probability')
title('Benjamin Abiemo')
plot(d,pro),grid on
end

 

[strider87]

this is the computation of outage probability on matlab


clear all
clc
clf

%Definition of constant

%path loss exponent lambdaa = [2 8]
lambda=3;

%Distance d0=1
d0=1;

%Distance between transmites and receiver
d=[10:0.001:200];

%Constant c=1àlog(K)
c=-31.54;

%Transmited powe pt =[10 100] in dBm
pt=[10:20:90];

%Variance var=sqrt([8 12])
var=3;

%Minimum power pmin=[-500 -100]
pmin=-100;

for i=1:5
%Calculation of z

z=(pmin-(pt(i)+c-10*lambda*log(d/d0)))/(var);

%Calculation of Q

q=0.5*erfc(z/sqrt(2));

%Calculation of the probability
pro=1-q;

%Output
hold on;
xlabel('Distance')
ylabel('Outage probability')
title('Benjamin Abiemo')
plot(d,pro),grid on
end

thank you ericiland. this code has been really helpful. could you explain the meaning of this %Constant c=1àlog(K)
c=-31.54; for further understanding. i'm little confused. thank you once again