- This topic has 11 replies, 2 voices, and was last updated 9 years, 2 months ago by alistu.
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August 25, 2015 at 4:15 am #24068cheeParticipant
Hello everyone. i have an idea but not sure if it will work.
i have measured rain data and have a formula to convert rain rate to attenuation in dB. is it possible that by using Matlab,when keying in the rain rate, the attenuation of the fso channel component will change accordingly? -
August 25, 2015 at 4:38 am #24069alistuParticipant
Hi Chee,
You can actually do this without using Matlab. you just need to add the rain rate as a new parameter to the global parameters, and then use the formula you have for this purpose (which makes use of “rainrate” parameter you have defined) in script mode for attenuation value in the FSO channel properties to relate the rain rate to the attenuation.
Cheers!
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August 25, 2015 at 5:01 am #24071cheeParticipant
thanks alistu, do you have any more information regarding this?
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August 25, 2015 at 5:24 am #24072alistuParticipant
You’re welcome Chee! You mean more information on how to make these changes? If my explanations are not clear to you, you can attach your simulation file and give me the formula which relates the attenuation to rain rate, so that I make the modifications myself in the way I described in my previous comment.
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August 25, 2015 at 5:36 am #24074cheeParticipant
thank you alistu. actually this is because i only have basic understanding on optisystem, so i’m not able to understand high level operation. the formula is rather simple, attenuation = 2.03(rain rate)^0.74. rain rate have one decimal place.
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August 25, 2015 at 6:13 am #24077alistuParticipant
I should have explained more vividly. However, I attached the file. Double click in the layout background and you’ll see the parameter “rainrate” I have added. Double-click on FSO and click on “evaluate script” button to see the calculated value of attenuation with regard to your formula. You can make changes to the formula by clicking on the small “s” button next to “attenuation”. Please ask if you have any further questions.
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August 25, 2015 at 6:47 am #24080cheeParticipant
i am sorry, why is the file is in doc?
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August 25, 2015 at 6:57 am #24082alistuParticipant
I don’t know why it has been saved like that, but you can open it with optisystem 13.0.3 for sure.
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August 25, 2015 at 7:01 am #24083cheeParticipant
can i know how you key in the formula in fso component?
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August 25, 2015 at 7:09 am #24085alistuParticipant
Sure! As you open the FSO channel properties window, you change the option on the “mode” column to “script” for any parameter you wish. After that, you just need to click on a small button with a “s” on it in the “value” column of the desired parameter to open a new window named “parameter script editor”. There you type the formula.
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August 25, 2015 at 7:47 am #24086cheeParticipant
wow! got it. thank you very much.
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August 25, 2015 at 8:11 am #24087alistuParticipant
You’re welcome!
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