Possible Channel Models for FSO

[Remo De Suza]

Hello Everyone.

Can anyone tell me What are the possible Channel Models that can be used for Free space optics?
Looking forward for your responses.
Thanking You.

With Regards
Remo De’Suza

[prakash jat]

hi remo
1. log normal
2. gamma-gamma
3. negative exponetial
4. diffuce( indoor)
5. double genralized gamma -gamma

[Remo De Suza]

Hello Prakash.
Thank you very much for your response. Do you have a matlab code for any of the channel models?

regards
Remo

[SAHIL SINGH]

Hi Remo,

I agree with both praksh and rather… also the linlks posted by rather are quite helpful and informative… Thanks rather for your efforts…

Regards
Sahil Singh

[Remo De Suza]

Hello Sahil Singh.
Thanks for your help. I appreciate. I need a matlab code.

Regards
Remo

[SAHIL SINGH]

Hi Rather,

You are welcome and no need for thanks…Since you have joined the forum recently..Keep discussing your queries on the forum.. It is really quite helpful…. All the best

Regards
Sahil Singh

[Remo De Suza]

Hi All.
Thanks for your concern. Please can you help me in getting a matlab code. I need it urgently.

Regards
Remo

[Ankita Sharma]

Hi Remo,

Prakash had very clearly mentioned about the possible channel models that can be used for free space optics.. Thanks for the information..

Regards
Ankita

[Remo De Suza]

Hi Ankita.
Thank you for your concern. I need the MATLAB code for any of the models prakash has aforementioned.

Regards
Remo

[Ankita Sharma]

Hi Remo,

You are welcome.. matlab code for what ? can you please specify..

Regards
Ankita

[Remo De Suza]

For the channel models for FSO which prakash has named in first comment. I had mentioned previously as well.

[Ankita Sharma]

Hi Remo,

Well I am not aware about it.. will try to see if I can be of help…

Regards
Ankita

[Remo De Suza]

ok Thanks anyway.

[Ankita Sharma]

Hi Remo,

You are welcome… Hope your query gets resolved soon

Regards
Ankita

[Remo De Suza]

Hello Ankita

Hopefully. Anyways Thanks.

Regards
Remo

[SAHIL SINGH]

Hi Remo,

I too am unaware about the matlab code… Hope someone else on the forum helps you in resolving your query…

Regards
Sahil Singh

[Remo De Suza]

Hello Sahil singh.

Thanks for your concern and showing some interest. I hope i get it asap.
Regards
Remo

[SAHIL SINGH]

Hi Rather,

Thanks for your appreciation…

Regards
Sahil Singh

[Remo De Suza]

?

[SAHIL SINGH]

Hello Remo,

Hope your query gets resolved soon.

Regards
Sahil Singh

[Remo De Suza]

Thanks Sahil.

[SAHIL SINGH]

HI Remo,

You are welcome…

Regards
Sahil Singh

[prakash jat]

hello friends

i will post all of the matlab code of possible channel ( please post again when you do in optisytem so that everyone can get help)

[prakash jat]

1. kim model for oudoor condition(courtesy of w.o. popolla , rajbhandari sir) reference book.- woc with matlab
%****To evaluate attenuation coefficient as a function of
visibility
%***Using the Kim model
clear
clc
% Wavelength in nm
wavl=830;
% Visibility values in km
Visibility=0.1:0.1:50;
for i=1:length(Visibility)
V=Visibility(i);
if (V >= 50)
q=1.6;
elseif (V > =6) && (V < 50)
q=1.3;
elseif (V > =1)&&(V < 6)
q=0.16*V+0.34;
elseif (V > =0.5)&&(V < 1)
q=V−0.5;
else
q=0;
end
Att_coeff(i)=(3.91/V)*(wavl/550)ˆ-q;
Att_coeff_dB_km(i)=10*Att_coeff(i)/log(10);
end
% Plot function
semilogy(Visibility,Att_coeff_dB_km)
xlabel(‘Visibility in km’)
ylabel(‘Attenuation coefficient in dB/km’)

[prakash jat]

1. log normal model( refernce -Optical Wireless Communications: System and Channel Modelling with MATLAB®
Z. Ghassemlooy, W. Popoola, S. Rajbhandari)
%PDF of log normal distribution
clear
clc
% E[I] value
Io=1;
I=0:0.005:3;
%Log irradinace variance values
Var_l=[0.1,0.2,0.5,0.8];
for i=1:length(Var_l)
for j=1:length(I)
B=sqrt(2*pi*Var_l(i));
C(j)=log(I(j)/Io)+(Var_l(i)/2);
D=2*Var_l(i);
pdf(i,j)=(1/I(j))*(1/B)*exp(−((C(j))ˆ2)/D);
end
end
%plot function
plot((I./Io),pdf)
xlabel(‘Normalised Irradiance, I/E[I]’)
ylabel(‘p(I)’)

[prakash jat]

hi everyone

[Remo De Suza]

Hi Prakash.
I am really thankful for the help you have provided me with and i appreciate your efforts. I had messaged you also. Please check the inbox. This is really helpful.
Do you work on FSO design as well?

Thanks & regards
Remo

[Kanwarjeet Singh]

Hi Remo,
The code must help you. I had messaged you about your project but got no response for it. Looking for your response Kindly check.
Thanking you.

Regards
Kanwarjeet

[FAYIQA NAQSHBANDI]

HELLO REMO..

The code provided by prakash may be just helpful for you.. You can aslo go through the forum where channel models have been discussed..

Regards

[Rajguru M. Mohan]

Hi remo,
Please visit following links for details on possible channel mode in FSO:
A very common used turbulence model assumes that the variations of the medium can be
understood as individual cells of air or eddies of different diameters and refractive indices.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5457931
https://arxiv.org/ftp/arxiv/papers/1203/1203.3006.pdf
http://www.mecs-press.org/ijcnis/ijcnis-v4-n3/IJCNIS-V4-N3-3.pdf
https://www.osapublishing.org/jocn/abstract.cfm?uri=jocn-2-5-293
https://www.researchgate.net/publication/225005739_Simplified_Channel_Model_for_Simulation_of_Free-Space_Optical_Communications

Thanks and regards,
Rajguru

[shafeen al yasin]

Hi All,
Thank you for the code prakash. I appreciate your efforts

regards
Shafeen

[Rahul Tiwari]

Hi Prakash,

Thanks for providing the code… Surely it will help remo…

Regards
Rahul Tiwari..

[Rajguru M. Mohan]

Hi REmo,
The Matlab code for Lognormal Distribution pdf
By taking an example :
Suppose the income of a family of four in the United States follows a lognormal distribution with mu = log(20,000) and sigma = 1.
Compute and plot the income density.

x = (10:1000:125010)’;
y = lognpdf(x,log(20000),1.0);

figure;
plot(x,y)
h = gca;
h.XTick = [0 30000 60000 90000 120000];
h.XTickLabel = {‘0′,’$30,000′,’$60,000’,…
‘$90,000′,’$120,000’};

[Rajguru M. Mohan]

Hi Remo,
Program to generate the exponential sequence

n=input(‘Enter the duration of the signal N = ‘);
a=input (‘Enter the scaling factor a = ‘);
t=0:.1:n-1;
y=exp(-a*t);
plot(t,y);
ylabel (‘Amplitude’);
xlabel (‘Time Index’);
TITLE (‘Exponential Signal’);

Thanks

[FAYIQA NAQSHBANDI]

HELLO RAJGURU..
Can you please tell me the source where you have got the code from..?

Regards

[Remo De Suza]

Hello Rather.
Thanks for your help. I need a matlab code for channel models for FSO.

Regards
Remo

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