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[Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 65, Issue 45
From: |
CHIN-YA HUANG |
Subject: |
[Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 65, Issue 45 |
Date: |
Sat, 26 Apr 2008 04:08:32 +0800 |
> Message: 6
> The OFDM system uses fft_length number of subcarriers and
> occupied_tones
> number of used subcarriers. The used subcarriers are mapped to the
> middle of the fft_length subcarriers leaving the same number of
> guardband subcarriers on either side. The middle two subcarriers are
> also nulled to avoid DC affects.
>
> The mapping is done in gr_ofdm_mapper_bcv.cc. If you want to play with
>
> this, I'd make a copy of this one as a different version of the mapping.
>
> Tom
>
Thanks Tom.
Do you mean mapping to the fft_length?
But, my questions is when received a packet, I saw the code in
gr_ofdm_mapper_bcv.cc that
the bits in the packet is sequentially to the subcarrier in order, and then do
modulation according to desired constellation. Do I misunderstand anything?
Regards.
Yaya
- [Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 65, Issue 45,
CHIN-YA HUANG <=