Re: Problem with OOT Interpolator Python module

[George Edwards]

Hi Cinaed,

Thanks for the attempt!

I will continue to seek a solution via experimentation with trying more permutations and going back to Gnuradio Discussion if I still cannot find something to stick.

Regards,

George

George

On Sat, Jan 23, 2021 at 11:15 PM Cinaed Simson <cinaed.simson@gmail.com> wrote:

Hi Edward - okay, I sent the wrong copy anyway - the one I sent wasn't finished.When I change the inputs to 5 complex numbers I get 9 complex values.

And that's good because it appeared you weren't doing anything.

See the loop

  for k in range(0,2)

which is loop over only 3 values - may be you're clipping your output?

I don't anything about the OOT module or C++.

Sorry - I can't help you.

-- Cinaed
S
  

On 1/23/21 5:37 PM, George Edwards wrote:

Hi Cinaed,

Thanks again for your suggestion.

I can tell it will not work because I am not writing plain stand alone Python. My code is written within Gnuradio constructs in an OOT module. The QA test shows the module is reading in the input complex samples (5 complex samples) and responding with the correct amount of output samples (10 complex samples). However, it was working properly all 10 output samples would be 1+j1. Instead only the first two and last two samples are correct and the middle value 6 values are j0 (which are wrong). So the question is: "how do I fix my code to output 10 samples of 1+j1". Based on how I have written the code, I am under the belief that I am writing 1+j1 to the output buffer 10 times, but my output is not 1+j1 10 times, so something is wrong. So I am looking for help on how to modify the code to fulfill the proper operation of Gnuradio OOT Interpolator module.

Thanks again for the help.

George 

On Sat, Jan 23, 2021 at 7:00 PM George Edwards <gedwards.eng@gmail.com> wrote:

Thanks Cinaed!

I will test how it works.

George

On Sat, Jan 23, 2021 at 2:58 PM Cinaed Simson <cinaed.simson@gmail.com> wrote:

Hi George - I'm presuming the enclosed example.py script is what you're trying calculate - and that the input data is complex. 

I invented my own data.

If true, it should be easy to adapt it to your problem by combining the 2 loops for any value of n.

-- Cinaed

On 1/22/21 10:49 AM, George Edwards wrote:

Hello,

I am working with the OOT Interpolator template and I set the interpolation factor to 2. In the QA file I input 5-complex samples  and based on my simple code below in the work() method, I expect the QA test to return 1+j1, 10-times (5x2). The QA returns ((1+1j), (1+1j), 0j,  0j,  0j,  0j,  0j,  0j,  (1+1j) ,  (1+1j)). I have tried a lot of different coding permutations and this is the closest I come to a solution, but it is wrong!!!  Any help is greatly appreciated!

    def work(self, input_items, output_items):

        in0 = input_items[0]

        out = output_items[0]

        for ii in range(0,len(in0)):

            for k in range(0,2):

                out[k] = 1.0+1.0*1j

       

        return len(output_items[0])

 

Thanks,

George