Re: [Discuss-gnuradio] QAM demod Error in GRC

[Marcus D. Leech]

On 19/05/2011 1:21 PM, Robert McGwier wrote:
> Vlad
>
> It is apparent to me that you did not understand Josh's explanation. 
>  Possibly he was not forceful enough. ;-).
>
> This is not an error.  It is the mathematical consequence of doing QAM 
> with rotational symmetries.  YOU MUST provide your OWN synchronization 
> to remove the phase ambiguity.  It is not a bug or an error. It is a 
> feature.  It is the mathematical nature of the beast.
>
> Bob
Perhaps I have only part of the conversation here, but it sounds like 
the main complaint is that there are internal errors inside the
  QAMx, x=8,16,64,256 demod blocks--they're implemented as hierarchical 
blocks in Python.

Looking into it, it seems like there still aren't any implementations of 
QAMx demodulators--what is there is basically a hollow shell that
  does nothing useful.