Re: [Discuss-gnuradio] Softbits in gr-ieee 802.11 ?

[sumit kumar]

Ok a correction

I declared it like this inside the constellations.h , now I am waiting for the compilation to finish 

    class DIGITAL_API constellation_bpsk : public constellation

    {

    public:

      typedef boost::shared_ptr<constellation_bpsk> sptr;

      // public constructor

      static sptr make();

      ~constellation_bpsk();

      unsigned int decision_maker(const gr_complex *sample);

      float decision_maker_soft(const gr_complex *sample);

    protected:

      constellation_bpsk();

    };

On 19 January 2018 at 15:08, sumit kumar <address@hidden> wrote:

Ok, so shall I do like this :

In the file /gnuradio/gr-digital/include/gnuradio/digital/constellations.h under public section I declare my function as follows 

class DIGITAL_API constellation

      : public boost::enable_shared_from_this<constellation>

    {

    public:

float decision_maker_soft(const gr_complex *sample) = 0;

}

and In the file /gnuradio/gr-digital/lib/constellations.cc I add this 

    float

    constellation_bpsk::decision_maker_soft(const gr_complex *sample)

    {

      return (-4*real(*sample)); // LLR for BPSK

    }

After this I recompile gnuradio and then recompile gr-ieee-80211.. right ? 

On 19 January 2018 at 14:51, Michael Dickens <address@hidden> wrote:

The GR constellation programming uses a base class that defines the API that will be SWIG-ified back into Python. So the base class must contain your "decision_maker_soft" method. Then you overload it for any inheriting class such as "constellation_bpsk". Hope this helps! - MLD

On Fri, Jan 19, 2018, at 8:43 AM, sumit kumar wrote:

Actually I have to test it in a interference limited environment, I guess the soft demodulate will be needed. I saw your blog post about how you cleverly used your won constellations https://www.bastibl.net/constellation-objects/

However when I try doing something like that, I get errors. 

For example, I defined my own function decision_maker_soft inside constellations_impl.h as follows 

class constellation_bpsk_impl : public constellation_bpsk

{

public:

constellation_bpsk_impl();

~constellation_bpsk_impl();

unsigned int decision_maker(const gr_complex *sample);

        float decision_maker_soft(const gr_complex *sample);

};

and then defined it in constellation_impl.cc as 

float

constellation_bpsk_impl::decision_maker_soft(const gr_complex *sample) {

return (-4*real(*sample));

}

But when I call my function like this 

mod->decision_maker_soft from ls.cc (least square equalizer cc file), it says mod object has no member decision_maker_soft

Why does mod object not look my decision_maker_soft as it is a method of constellation_bpsk_impl ?? 

What am I missing here ? 

I thought that mod object is looking your decision_maker inside constellations_impl, it shud see mine too... 

--

Sumit Kumar

--

Sumit Kumar