Multi Ports OFDM

[Mohamed Ben zegalam]

Hi All,

I am working on OFDMA PON by using multi ports OFDM modulator at OLT, I manage to design two ports OFDM as per the attached file, but when I increase the number of the ports I noticed that just ports that their sub-carriers close to the middle of the FTT point are giving a good result.
I tried to play with the position of ports sub-carriers by putting some times the port 1 in the middle of the FTT, or port 3 in the middle. always two ports that close to the middle of the FTT point are good one.

Is there any one face this problem before?, any suggestion I will be grateful

[Mohamed Ben zegalam]

Is there any one manage to design more than two ports OFDM

[Mohamed Ben zegalam]

It look likes no one has this issue before. I am wondering if some one know how to solve this issue. Any suggestions it will be helpful.

Thanks in advance

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