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Re: [Discuss-gnuradio] Question about ofdm_sync_long block of gr-ieee802

From: Bastian Bloessl
Subject: Re: [Discuss-gnuradio] Question about ofdm_sync_long block of gr-ieee802-11 module
Date: Mon, 11 May 2015 06:29:59 +0200


> 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.


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