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Re: [Discuss-gnuradio] Question about ofdm_sync_long block of gr-ieee802
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From: |
Bastian Bloessl |
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Subject: |
Re: [Discuss-gnuradio] Question about ofdm_sync_long block of gr-ieee802-11 module |
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Date: |
Mon, 11 May 2015 06:29:59 +0200 |
Hi,
> On 10 May 2015, at 04:21, Jeon <address@hidden> wrote:
> I missed one another thing.
>
> `if(((d_count + o) % 64) == 0)` statement in
> https://github.com/bastibl/gr-ieee802-11/blob/master/lib/ofdm_sync_long.cc#L141
>
> Is this because of a length of an OFDM signal being a multiple of 64, which
> is the number of subcarriers? (Except cyclic prefix)
Yes, the next step is the FFT that works on blocks of 64 samples. The line you
quoted is executed when a new frame is about to start. It’s to ensure that the
new frame starts at a multiple of 64 samples.
Best,
Bastian