From: WarmSpgs@aol.com
Message-ID: <53.44a5545.27f3564d@aol.com>
Date: Wed, 28 Mar 2001 09:59:25 EST
Subject: Re: LF: RE: WOLF (BPSK) modulation continuous phase modulation.
To: rsgb_lf_group@blacksheep.org
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In a message dated 3/28/01 2:58:35 AM Eastern Standard Time, 
rik.strobbe@fys.kuleuven.ac.be writes:

<< What happens if you send a BPSK (instant phase switching) as reference
 signal to a PLL ? >>

An interesting thought.  (Apologies to everyone for the previous message 
which ended at this point.  I was typing merrily along, when AOL abruptly 
announced: "your mail has been sent.")

The PLL would certainly perform filtering action, but I suspect some 
attention would need to be paid to the loop filter.  There will be a tradeoff 
to be determined between settling speed and overshoot, but apart from that 
I'd think it would be physically simpler to implement than the high-Q 
filtering and limiting.  An abrupt 180 degree transition is a bit ambiguous 
for some phase detectors to handle, so a single stage of L-C pre-filtering 
may still be desirable.  Overall, though, this seems as if it should be 
practical to try.

73,
John