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
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