Dear everyone:
In ofdm_receiver.py there is chan_coeffs =
gr.fihan_coeffs(1.0,1.0,tb+bw,tb,gr.firdes.WIN_HAMMING), which is to
determine the parameters of fir low-pass filters. My question is about
the third parameter, which denotes the center of transition band, and it
is computed as tb= bw*0.08. So can you explain to me why we should set
the center of transition band tb+bw and how tb is computed? Besides in
benchmark_rx case, midpoint of trans. band is directly set 1 and width
of trans. band 0.5. So in general how do we set the bandwith and
midpoint of band?
Best regards