Close-In path loss model

Hi team,

I am trying to replicate some results from the research paper "Multi-Frequency Multi-Scenario Millimeter Wave MIMO Channel Measurements and Modeling for "B5G Wireless Communication Systems".

I am trying to model the Close-In path loss model from the paper, and trying to creating the following plot.

for the following parameters;

I have reproduced the Free space path loss model, but I am not able to reproduce the Close-In path loss model. I would really appreciate any kind of input on this topic.

function PL = My_FreeSpace_PL(freq, dist)

c = physconst('lightspeed');

PL = fspl(dist,c/freq);

end

function PL = My_CI_PL(freq, dist,n,sigma)

c = physconst('lightspeed');

PL = fspl(dist,c/freq) + 10*n*log10(dist) + sigma*randn(size(dist));

end

%% Main Code

clc;

clear all;

close all;

%% Free Space path loss model

c = physconst('lightspeed');

R0 = 1:2:1000;

freq = 28e9;

% apathloss = fspl(R0,c/freq);

for k = 1:length(R0)

apathloss(k) = My_FreeSpace_PL(freq, R0(k));

end

figure(2) % Replicating the research paper FSPL

semilogx(R0,apathloss);

grid on;

% ylim([90 200]);

legend('Frequency: 28 GHz');

xlabel('Tx-Rx distance (m)');

ylabel('Path Loss (dB)');

title('Free Space Path Loss');

%% CI path loss model

% 28 GHz band

n1 = 2.637;

sigma1 = 5.47;

f1 = 28e3;

for k = 1:length(R0)

CI_PL1(k) = My_CI_PL(f1,R0(k),n1,sigma1);

end

figure(2)

semilogx(R0,CI_PL1)

grid on;

My Output:

Answer 1

[Rahul Gulia]

Hello everyone,

One solution that I found myself was to increase the distance from

R0 = 1:2:1000;

to

R0 = 1:250:1000;

[mer potter]

Hello. Have you solved your problem with the close in path loss model? I have a similar assignment in my graduate thesis and it would be awesome if you could send me your code.

[Rahul Gulia]

Yes I solved the problem. I have also put my code over there. Kindly copy it and use it for your reference.

And change the distance to R0 = 1:250:1000;

Hope that helps.

Thank you,

Rahul Singh Gulia