- This topic has 5 replies, 4 voices, and was last updated 8 years, 9 months ago by
Ranjeet Kumar.
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March 8, 2016 at 3:24 am #31849
Ranjeet KumarParticipantHi,
If possible explain the different parameters of OFDM modulator like position array,no. of subcarriers, no. of prefix points and no. of fft
and how could we use these parameters to maximise Q-factor in OFDM PON.
I am uploading an osd file of 4 user OFDM , here i have problem that all 4 downlink have different Q-factor, if possible please correct it because only 2nd one having good Q-factor left are useless. Please try to explain it. -
March 8, 2016 at 8:56 am #31893
ZULKARNAINParticipanthi ranjeet..
In my opinion the OFDM block position array arranges the position of the central frequency of the OFDM spectra, but please check whether this is true.
For your reference i am attaching few links in which this is discussed which might help you. -
March 9, 2016 at 12:11 am #31969Ranjeet KumarParticipant
Hi ZULKARNAIN,
Thank you for your efforts to make me understand.But the above discription is not quite sufficient for understanding.
My question regarding OFDM modulator parameters to optimoze the results. here i am uploading OFDM PON with 4 users in 2nd case we get very good Q-factor having position array of 1888 but others users are not havibg good Q-factor.-
March 10, 2016 at 11:46 pm #32405
FAYIQA NAQSHBANDISpectatorhi ranjeet,
In the recent past, the component functioned in the following fashion. Setting the Number of FFT points sets the total number of available (not necessarily used) sub-carrier positions centered at DC or 0 Hz. The number of sub-carriers would then set the total number of sub-carriers actually used (for example 4 sub-carriers might be used for a QPSK format). The position array then sets the starting point of the range of the sub-carriers used. You can refer to the link provided by alistu for further refrence.
Thanks and regards
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March 10, 2016 at 8:45 am #32247
alistuParticipantHi Ranjeet,
In order to understand the aforementioned parameters in OFDM components, please refer to the answer provided in the link I have addressed below, where I have asked the more or less the same question a while ago and here is Damian’s answer:
Please feel free to ask any further questions you may encounter. I suggest you also go through the help section of the component if you find the answer inadequate in any way (which I believe is quite comprehensive).
If you are using OS12 OFDM components, I suggest you choose the used subcarriers in between the available subcarriers, the way set in the examples provided.
Regards
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March 13, 2016 at 5:07 am #32620Ranjeet KumarParticipant
Thank you Alistu sir
I will use the parameters as per your suggestions and then will seek for improved results.
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