FSO fading model

[Naazira BadarParticipant]

Hi all..
Could anyone tell me which fading model should I employ for FSO if my link range is 2.5 km and I’m simulating it for all values of attenuation coefficient representing weather range of clear to thick fog?

Thanks.

[prakash jatParticipant]

hi naazira
optisystem is using gamma- gamma channel in fso component , if you want try differnt then you can use negative exponetial channel( which is also better) through matlab interfacing in optisystem

[aasif bashir darParticipant]

hi all
some associated post with your topic are already present in form.
1.http://optiwave.com/forums/topic/fso-fading-models/

2.http://optiwave.com/forums/topic/variable-attenuation-in-a-single-fso/

hope you might get some help from these posts.

with regards

[Naazira BadarParticipant]

Thanks both you.

Prakash, I need to change just one parameter, i.e. the scintillation index of the FSO channel.Do I need to add a MATLAB module itself, or do I need to change the parameter to script mode and load it with program of any particular channel model?

[aasif bashir darParticipant]

hi all,

i guess you can not add matlab module to it. because it is just a parameter of o FSO component. and we generally co simulated matlab with the optisystem where we make some componenent with matlab(i.e matlab component)

this matlab component can be optical or electrical or both.

with regards

[Naazira BadarParticipant]

Yes Aasif. I too think so. Thanks.

[aasif bashir darParticipant]

hi all,

i think there may or may not script for parameter, i.e. the scintillation index.may be there could be option to attach the .dat file or text file in thee parameter window of the FSO. Be patient any one explain it soon.

with regards

[Naazira BadarParticipant]

Aasif, scintillation index parameter has an option to be changed to script mode.Could the MATLAB code for a fading model not be placed in the script?

[alistuParticipant]

Hi Naazira,

Matlab code cannot be used in the script mode. Only a relation can be used in the script mode whose answer is only one number, and not a series or a vector of numbers or an equation. And the parameters used in that relation should either be numbers or have been defined somewhere in the implementation.

Regards

[Aabid BabaParticipant]

Hello Naazira,
As for as writing Matlab code in the script is concerned , you could refer to a comment which was posted by Damian in reply to a question regarding changing the script.

apodization function using script

I hope it clears your doubts. Alistu has also explained it to the point. Hope this is helpful in some way.
Regards

+5

[aasif bashir darParticipant]

hi all,
this what i was talking about that we cannot make matlab module and attach it to FSO component in matlab. the link provided by aabid is the post started by me. i message damian for making reply to my post, because i had the similar problem.

you can also message him. he will provide you better suggestions

with regards

[Aabid BabaParticipant]

hello Asif,
Yeah you actually had started the topic and i had gone through your post and i just had come across this script thing mentioned by Damian.
He clearly mentions of not being able to write code in the script. But as far as i understand we can not write Matlab code in the script although we can create a MATLAB module for FSO. You are confusing yourself here. It is the code for the script we cannot write , Matlab Module we can create for FSO.
Thank you.
Regards

+7

[Naazira BadarParticipant]

Hi..

Thanks all for your comments.
Well I understand your point. I think I can’t write MATLAB code in the script mode.But I think i should see how I can interface a MATLAB module to my FSO channel.

[Aabid BabaParticipant]

you are welcome naazira,
If you cannot figure out HOW , you are free to mail the optiwave support at support@optiwave.com.

+2

[Naazira BadarParticipant]

hi all..
I just went through the link posted by Aabid about Aasif’s query . Well, as it is known that script can have a relation of some formula. So, I think the expression of a fading model could be put in the script itself, if it doesn’t have to be an entire MATLAB code.

Regards

[Naazira BadarParticipant]

Yes Aabid. Actually the support had mentioned about adding the component as well. But i’m confused because i have to make code of an already existing parameter of an Optiwave component variable and not actually add a new function there at.
Thanks for your help anyway.

+1

[Aabid BabaParticipant]

Okay.
If so then you better ask Damian or Marc because they would be exactly knowing what component it is and where it is. All you would have to do then would be just changing the parameters instead of creating a new component in the MATLAB.

+3