Re: [Discuss-gnuradio] costas ambiguity and correlate-and-sync block in qpsk

[Andy Walls]

On Sun, 2016-04-03 at 19:33 -0400, Andy Walls wrote:
> On Sun, 2016-04-03 at 20:24 +0000, Landsman, Arik wrote:

> 
> > btw, played with tag delay manually, this has an immense effect on
> > costas rotation once fading model is added to channel.
> 
> Well there are a number of things going on here, so let me state how
> things are set up:
> 
> 1. The reference sample sequence given to the corr_est block is your 8
> symbol preamble, modulated at 10 samples/symbol, minus the first 5
> samples of the first symbol, and minus the last 5 samples of the last
> symbol.  So 150 samples total, spanning from preamble symbol 0.5 to
> preamble symbol 7.5.

Argh...

... 16 symbol preamble ...
.. to preamble symbol 15.5.

Counting bits is too hard for me apparently. :)

-Andy