oversampling in OFDM

Started by mishal81 October 14, 2011
Hi All,,

Plz help me for ofdm simulation. I have tried to simulate ofdm signal with
64 subcarriers, with an oversampling of factor 4 in frequency domain. Now
I've got 256 QPSK symbols with zero paddings.I'm doing IFFT of 256 points.
But I need to modulate my data on 64 subcarriers. then how would it be
possible if i'm doing IFFT/FFT of 256 points. plz clarify me this thing, if
i have zeronpadded signal, do i need to remove these in between zero
symbols before transmission??????

And one more thing, do i need to apply low pass filter at the receiver
side????

plz do reply me,,,i need help



mishal81 wrote:
> Hi All,, > > Plz help me for ofdm simulation. I have tried to simulate ofdm signal with > 64 subcarriers, with an oversampling of factor 4 in frequency domain. Now > I've got 256 QPSK symbols with zero paddings.I'm doing IFFT of 256 points. > But I need to modulate my data on 64 subcarriers. then how would it be > possible if i'm doing IFFT/FFT of 256 points. plz clarify me this thing, if > i have zeronpadded signal, do i need to remove these in between zero > symbols before transmission?????? > > And one more thing, do i need to apply low pass filter at the receiver > side???? > > plz do reply me,,,i need help > >