Re: [Discuss-gnuradio] OFDM / DAB demodulation

[Eric Blossom]

On Fri, Mar 31, 2006 at 05:10:40PM -0500, Clark Pope wrote:
> I would doubt that unless your USRP is defective. The phase noise should 
> only become a major factor at baud rates below about 10 kbaud.
> 
> What's the actual bandwidth of the DAB signal? Did you try collecting at 4 
> MSPS and then downsampling to the FFT sample rate? Maybe the CIC or 
> compensation filter transition are distorting the final result.
> 
> -Clark
> 
> >>
> >> DAB is using COFDM with pi/4-DPSK on 1536 subcarriers (see www.etsi.com, 
> >standard
> >> EN300401 for details). I wrote some Matlab code to demodulate the
> >> signal. The data is resampled from 2 MHz (URSP) to 2.048 MHz (DAB 
> >Standard).
> >> A frequency offset is compensated manually.

How did you resample from 2.000MHz to 2.048 MHz?

Eric