On Sat, May 17, 2008 at 01:07:29AM +0800, Chin-Ya Huang wrote:
> Hi,
>
> I want to double check that if the default value of fft_length for the ofdm
> is 512 ?
>
> Thanks
> Chin-Ya
If you care, you should specify it. Don't count on the default never changing.
Investing two minutes looking at code reveals that ofdm.py defaults it to 512.
def add_options(normal, expert):
"""
Adds OFDM-specific options to the Options Parser
"""
normal.add_option("-m", "--modulation", type="string", default="bpsk",
help="set modulation type (bpsk or qpsk)
[default=%default]")
expert.add_option("", "--fft-length", type="intx", default=512,
help="set the number of FFT bins [default=%default]")
expert.add_option("", "--occupied-tones", type="intx", default=200,
help="set the number of occupied FFT bins
[default=%default]")
expert.add_option("", "--cp-length", type="intx", default=128,
help="set the number of bits in the cyclic prefix
[default=%default]")
I used a very special tool to figure this out: grep
It's probably installed on your system too...
Eric
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