I implemented the FBMC in USRP N210, but when i increase the number of subcarrier into 128, 254 the bandwidth is decreases to half as shown in the attached figures.
Dear Hadeel S. Abed ,
Welcome!
What is your sampling frequency?
The bandwidth is related to the sampling frequency fs. Namely the maximum frequency in the bas band is =fs/2.
It seems that you increase the double the number of subcarriers but you decrease the sampling frequency to half its initial value.
Please examine the sampling frequency in the different cases and report to us.
In order to increase the band width with increasing the number of subcarriers you have to increase the sampling frequency proportionally.
Best wishes
Simply put, you are keeping the sampling frequency constant and adding sub-carriers, that should ideally reduce the available bandwidth. In my opinion, Abdelhalim abdelnaby Zekry pointed you in the right direction. Like mentioned, you can do two things
- Keep the sampling frequency constant and increase the sub-carriers with the increasing power of 2s (even though you don't need small/lower number of sub-carriers, it will give you an estimate how overall bandwidth is affected).
- Keep your sub-carriers fixed (again with increasing powers of 2, lets say 2 sub-carriers) and increasing/decrease the sampling frequency (independently). This will give you an clear identification as in how the bandwidth pans out around your center frequency.
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