[Discuss-gnuradio] Coarse Frequency and related stuff

[Vanessa Gardellin]

Dear all,

I am trying to use the alamouti code implemented by trondeau.
Studying the gr_ofdm_frame_acquisition I found several concepts that
are not clear to me:

1)  d_phase_count: what does it mean?

2) coarse_freq_comp(int freq_delta, int count): which is the meaning
of this function?

3) what "-M_TWOPI*freq_delta*d_cplen/d_fft_length" represents?


Thank you

Vanessa

On Fri, Oct 21, 2011 at 1:39 PM, Vanessa Gardellin
<address@hidden> wrote:
> Dear all,
> I am trying to configure a simple flow graph where I have 2 USRP N210
> connected using a mimo cable.
> The ethernet is connected only to the device with IP 192.168.20.2.
>
> my python code is:
>
> self.uhd_usrp_source_0 = uhd.usrp_source(
>                device_addr= "addr=192.168.20.2, addr=192.168.20.3",
>                io_type=uhd.io_type.COMPLEX_FLOAT32,
>                num_channels=2,
> )
>
> _config = uhd.clock_config()
> _config.ref_source = uhd.clock_config.REF_MIMO
> _config.pps_source = uhd.clock_config.PPS_MIMO
> self.uhd_usrp_source_0.set_clock_config(_config)
>
>
> and my problem is that I can see the received led turned only on the
> 192.168.20.3 device.
>
>
> Moreover, it's not clear what channels are and how I should address
> the 2 devices.
>
> Thanks
>
> Vanessa
>



-- 
Vanessa GARDELLIN, Ph.D.
Researcher
Institute for Informatics and Telematics (IIT),
Italian National Research Council (CNR)
Via G. Moruzzi 1
56124 Pisa - ITALY
Phone: +390503153267
Room: B65/c
E-mail: address@hidden
WWW: http://www.iit.cnr.it/staff/vanessa.gardellin/
Skype: gardellin.vanessa