[Discuss-gnuradio] Re: scaling issue on USRP2

[George Nychis]

So maybe I should be scaling to abs(complex) instead. Will try this.

On Aug 14, 2010, at 6:26 PM, George Nychis <address@hidden> wrote:

> Whenever I send samples to the USRP2, I scale them between -1 and 1, such
> that the absolute value of the greatest real, and imaginary, component is 1:
> scale= 1 / max([abs(real(signal)),abs(imag(signal))]);
> signal = scale * signal;
>
> I confirm that no real or imaginary components exceeds -1 or 1.
>
> However, when I transmit using my scaled signal, I get some major clipping:
>
> [image: clipping.JPG]
>
> If I do not scale my signal, I get a nice clean waveform:
>
> [image: not_clipping.JPG]
>
>
>
> Has anyone else noticed a problem when scaling on the USRP2?
>
> Thanks,
> George
> <clipping.JPG>
> <not_clipping.JPG>