RE: [Discuss-gnuradio] RE: [Commit-gnuradio]gnuradio-core/src/lib/general gr_correlate_acce...

[Tom Rondeau]

I've been wondering about that, too. It seems you'd still need frequency
lock even if you don't need phase lock on the signal. I'd like to play
around with all of these concepts (lucky for me there's this cool
open-source SDR platform out there) when I get back from a few days of
vacation.

Tom


> -----Original Message-----
> From: Johnathan Corgan [mailto:address@hidden
> Sent: Friday, June 30, 2006 11:16 AM
> To: Matt Ettus
> Cc: Tom Rondeau; address@hidden
> Subject: Re: [Discuss-gnuradio] RE: [Commit-gnuradio]gnuradio-
> core/src/lib/general gr_correlate_acce...
> 
> Matt Ettus wrote:
> 
> > On the other hand, since it is differential, you usually don't use a
> > costas loop with pi/4-DQPSK.
> 
> Is there a different way to assure frequency/phase lock, or are they not
> needed?  I know for differential detection constellation doesn't need to
> be locked in the correct absolute phase, but is it the case it can be
> left to rotate as well?
> 
> -Johnathan