Re: [Discuss-gnuradio] ofdm parameters

[Marcus Müller]

Hi Sara,
when looking into the "Instrumentation" Category in the Companion, you
will notice two subcategories with several different visualization types.
On many of these, you can set a number of input ports.

Greetings,
Marcus

On 22.06.2014 17:10, Sara Chérif wrote:
> 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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