- This topic has 36 replies, 9 voices, and was last updated 8 years, 10 months ago by
FAYIQA NAQSHBANDI.
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AuthorPosts
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April 9, 2016 at 1:13 am #36144
Remo De Suza
ParticipantHello 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 -
April 9, 2016 at 12:01 pm #36191
prakash jat
Participanthi remo
1. log normal
2. gamma-gamma
3. negative exponetial
4. diffuce( indoor)
5. double genralized gamma -gamma-
April 12, 2016 at 4:32 pm #36491
Remo De Suza
ParticipantHello Prakash.
Thank you very much for your response. Do you have a matlab code for any of the channel models?regards
Remo
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April 10, 2016 at 10:26 am #36233
SAHIL SINGH
ParticipantHi 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-
April 12, 2016 at 4:36 pm #36493
Remo De Suza
ParticipantHello Sahil Singh.
Thanks for your help. I appreciate. I need a matlab code.Regards
Remo
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April 10, 2016 at 3:26 pm #36261
SAHIL SINGH
ParticipantHi 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 -
April 12, 2016 at 4:37 pm #36494
Remo De Suza
ParticipantHi All.
Thanks for your concern. Please can you help me in getting a matlab code. I need it urgently.Regards
Remo -
April 12, 2016 at 4:40 pm #36495
Ankita Sharma
ParticipantHi 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 -
April 12, 2016 at 4:43 pm #36497
Remo De Suza
ParticipantHi Ankita.
Thank you for your concern. I need the MATLAB code for any of the models prakash has aforementioned.Regards
Remo -
April 12, 2016 at 4:44 pm #36498
Ankita Sharma
ParticipantHi Remo,
You are welcome.. matlab code for what ? can you please specify..
Regards
Ankita -
April 12, 2016 at 4:49 pm #36500
Remo De Suza
ParticipantFor the channel models for FSO which prakash has named in first comment. I had mentioned previously as well.
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April 12, 2016 at 4:49 pm #36501
Ankita Sharma
ParticipantHi Remo,
Well I am not aware about it.. will try to see if I can be of help…
Regards
Ankita -
April 12, 2016 at 4:50 pm #36502
Remo De Suza
Participantok Thanks anyway.
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April 12, 2016 at 4:57 pm #36503
Ankita Sharma
ParticipantHi Remo,
You are welcome… Hope your query gets resolved soon
Regards
Ankita-
April 13, 2016 at 2:04 am #36519
Remo De Suza
ParticipantHello Ankita
Hopefully. Anyways Thanks.
Regards
Remo
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April 12, 2016 at 5:00 pm #36504
SAHIL SINGH
ParticipantHi Remo,
I too am unaware about the matlab code… Hope someone else on the forum helps you in resolving your query…
Regards
Sahil Singh-
April 13, 2016 at 2:06 am #36520
Remo De Suza
ParticipantHello Sahil singh.
Thanks for your concern and showing some interest. I hope i get it asap.
Regards
Remo
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April 12, 2016 at 5:09 pm #36505
SAHIL SINGH
ParticipantHi Rather,
Thanks for your appreciation…
Regards
Sahil Singh -
April 13, 2016 at 2:08 am #36522
Remo De Suza
Participant?
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April 13, 2016 at 2:12 am #36524
SAHIL SINGH
ParticipantHello Remo,
Hope your query gets resolved soon.
Regards
Sahil Singh -
April 13, 2016 at 2:14 am #36525
Remo De Suza
ParticipantThanks Sahil.
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April 13, 2016 at 2:18 am #36527
SAHIL SINGH
ParticipantHI Remo,
You are welcome…
Regards
Sahil Singh -
April 13, 2016 at 10:03 am #36575
prakash jat
Participanthello 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)
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April 13, 2016 at 10:12 am #36576
prakash jat
Participant1. 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’) -
April 13, 2016 at 10:16 am #36577
prakash jat
Participant1. 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)’) -
April 13, 2016 at 10:17 am #36578
prakash jat
Participanthi everyone
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April 13, 2016 at 10:44 am #36586
Remo De Suza
ParticipantHi 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-
April 18, 2016 at 3:16 am #37741
Kanwarjeet Singh
ParticipantHi 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 -
April 19, 2016 at 2:26 am #38265
FAYIQA NAQSHBANDI
SpectatorHELLO 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
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April 17, 2016 at 4:39 pm #37653
Rajguru M. Mohan
ParticipantHi 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_CommunicationsThanks and regards,
Rajguru -
April 17, 2016 at 5:53 pm #37700
shafeen al yasin
ParticipantHi All,
Thank you for the code prakash. I appreciate your effortsregards
Shafeen -
April 18, 2016 at 12:22 am #37724
Rahul Tiwari
ParticipantHi Prakash,
Thanks for providing the code… Surely it will help remo…
Regards
Rahul Tiwari.. -
April 18, 2016 at 10:34 pm #38262
Rajguru M. Mohan
ParticipantHi 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’}; -
April 18, 2016 at 10:35 pm #38263
Rajguru M. Mohan
ParticipantHi Remo,
Program to generate the exponential sequencen=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
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April 19, 2016 at 2:28 am #38266
FAYIQA NAQSHBANDI
SpectatorHELLO RAJGURU..
Can you please tell me the source where you have got the code from..?Regards
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April 12, 2016 at 4:34 pm #36492
Remo De Suza
ParticipantHello Rather.
Thanks for your help. I need a matlab code for channel models for FSO.Regards
Remo
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