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Re: [Discuss-gnuradio] Why packet decode failure happen when fft-length

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] Why packet decode failure happen when fft-length is set to 64?
Date: Wed, 27 Mar 2013 10:20:43 -0400

On Wed, Mar 27, 2013 at 5:33 AM, Yingjie Chen <address@hidden> wrote:
> Hi guys,
> Thanks in advance. I am using usrp2 in OFM example. When I set
> fft-length to 64, subcarrier to 32,the receiver cannnot decode the
> packet correctly. The whole chunk of received data are almost false.
> However, when I set fft-length to 128, subcarriers to 64, nearly all
> packets can be decode correctly. I feel so confused about that. Does
> anyone know that?

Could be related to the subcarrier spacing in the bandwidth and
frequency offset. Try to hand-tune your tx and rx frequencies so they
are as close as you can get (using uhd_siggen and uhd_fft) them and
see if that helps.


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