0
$\begingroup$

I am investigating the spectrum shaping filter for OFDM modulation, and following an example on

https://www.mathworks.com/help/comm/ug/f-ofdm-vs-ofdm-modulation.html

In the part

F-OFDM Transmit Processing

of the example, I could not find the reason why we have to pack data in band center, which is similar to a bandpass filter, however a lowpass filter is considered in the example.

When I pack data from the zero-th frequency (i.e., the beginning of the frequency bin array), perform convolution with the filter, and decode at receiver; I got the wrong data.

When I pack data such that data symbols occupy the band center, perform convolution with the filter, and decode at receiver; I got the correct data.

Does it means that the filter is bandpass filter and is not low pass filter?

Thank you.

$\endgroup$
2
  • 1
    $\begingroup$ this is all in baseband. What specifically do you mean when you say "bandpass filter"? A low-pass filter in baseband is of course a bandpass filter in the equivalent bandpass system, but I'm not sure that's what you're asking about. $\endgroup$ Dec 22, 2021 at 14:09
  • 1
    $\begingroup$ Hi. I mean lowpass and bandpass in baseband. $\endgroup$ Dec 22, 2021 at 16:39

0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.