Re: [Discuss-gnuradio] ofdm parameters

[Sara Chérif]

Thanks Marcus .
I want to append 2 plots on same graph ( the transmitted signal and the received signal ) . I connected  WX GUI scope sink to the ofdm tx and another one to the ofdm rx . I put CFO model & channel model between the tx & rx . I want to compare between the signals while changing offset and noise. How can I append them on same graph ? & Is there any other method to plot in GNU Radio ?

Thanks in advance .

2014-06-21 17:29 GMT+03:00 Marcus Müller <address@hidden>:

Hello Sara,

It's hard to tell without you offering us the actual line where you call
make, but from looking at your symbols variable I'd say you have a tuple
containing a tuple of tuples of floats,
and what you need would be a
tuple of tuples containing complexes.

Note that (1,1j) is *not* a complex, but 1+1j is.

Greetings,
Marcus

On 21.06.2014 16:00, Sara Chérif wrote:
> Hello ,
>
> I want to implement ofdm system with these parameters:
>
> FFT length=128
>
> Occupied subcarriers=117.
>
> 4 pilots
>
> 1 DC
>
> 6 zeros subcarriers .
>
> I put  these parameters in ofdm tx & ofdm Rx:
>
> Occupied carriers =(range(-58,-42)+range(-41, -14) + range(-13, -7) +
> range(-6, 0) + range(1, 7) + range(7, 14) + range(15, 42)+range(43,60),)
>
> pilots carriers=((-42, -14, 14, 42,),)
>
> pilot symbols =(((-1,1j),(1,-1j),(-1,1j),(-1j,1),),)
>
>
> But I got this error , I don't understand what is wrong
>
>
> File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/digital/digital_swig.py",
> line 4635, in make
>     return _digital_swig.ofdm_equalizer_simpledfe_make(*args, **kwargs)
> TypeError: in method 'ofdm_equalizer_simpledfe_make', argument 5 of type
> 'std::vector< std::vector< gr_complex,std::allocator< gr_complex >
>> ,std::allocator< std::vector< gr_complex,std::allocator< gr_complex > > >
>> const &'
>
> Thanks.
>
>
>

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