- This topic has 12 replies, 4 voices, and was last updated 8 years, 6 months ago by
Damian Marek.
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March 2, 2015 at 6:44 am #18010
K. Esakki Muthu
ParticipantHow to measure the Phase of the received RF spectrum?
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March 2, 2015 at 10:46 am #18031
Damian Marek
ParticipantIn OptiSystem the electrical signals are represented by real sampled time depended signals. Therefore, the visualizers are not really set up to view the phase of the electric signals.
Probably the best way to look at the phase of the frequencies is to perform the transform in Matlab and display the complex values in the plot.
Regards
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March 4, 2015 at 11:07 am #18251
Ravil
ParticipantThe other suggestion is that you can measure it in indirect way by multiplication with the other signal (i.e. conjugate). But it would be sufficient only for 90 and 180 deg. phase change, I think…
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March 5, 2015 at 8:42 am #18323
Damian Marek
ParticipantYes, or by example there may be some complicated way of demodulating the phase (perhaps the phase demodulator), but it might be too complicated. I think the Matlab component would be best suited for this.
+1
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March 10, 2015 at 4:10 pm #18491
K. Esakki Muthu
ParticipantDear all, can u find any fault with this >osd file> I have made the length as sweep from 1 to 10 km but I am not getting BER for all the sweeps? why? please
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March 11, 2015 at 8:49 am #18507
Damian Marek
ParticipantThe issue results from the modulated and demodulated signal. In your demodulation the electrical signal becomes inverted. A logical 1 is represented by a negative voltage or current and the logical 0 is represented by a 0 voltage or current.
To fix it just add an Electrical Abs component or you can change the decision instant in the BER Analyzer.
Regards
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March 11, 2015 at 3:56 pm #18549
K. Esakki Muthu
Participantthank you Damian, let me try it. one more question.. I have an osd file of size 120 Mb, now the problem is I could not open it anymore? how to open it?
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March 12, 2015 at 8:57 am #18570
Damian Marek
ParticipantThat is a pretty large file. Generally that only happens when you save a bunch of “monitor” data. Did you set the program to save the monitor data?
What is the error you get when you try to open the file?
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March 12, 2015 at 4:11 pm #18591
K. Esakki Muthu
ParticipantError Message:< failed to open from the storage`.>
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March 13, 2015 at 9:20 am #18628
Damian Marek
ParticipantIs the project file the same as you attached above “Project21.osd”? What changes did you make to it if any?
Regards
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March 12, 2015 at 7:23 pm #18596
Ravil
ParticipantAgree with Damian, I would recommend to erase/re-write if possible when the size starts increasing that much…
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March 12, 2015 at 11:58 pm #18600
Heitor Galvao
ParticipantIf you try to simulate try using the monitor tool tool you turn off some monitors and studies specifically a monitor you need a good amount of RAM, see this topic: https://optiwave.com/forums/topic/twdm/
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March 13, 2015 at 12:02 am #18601
K. Esakki Muthu
Participantthank you all.
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