>one feature of the latest decoder is there to yield decodes before all 
>transmissions are completed.

 

Bill,

 

Was this a user request, or just a result of the new decoding algorithm?   (My 
curiosity has been piqued.)

 

Ed N4II.

 

From: Bill Somerville <g4...@classdesign.com> 
Sent: Tuesday, May 12, 2020 3:29 PM
To: wsjt-devel@lists.sourceforge.net
Subject: Re: [wsjt-devel] WSJT-X 2.2.0-rc1

 

On 12/05/2020 20:22, Christoph Berg wrote:

Re: Bill Somerville

this change is deliberate. Prior versions favour strong stations calling at
the lowest audio offset, we think it is better to randomize the frequency
order to give all stations more equal weighting. This is particularly in
respect of the "Call 1st" feature. There is also another factor, the latest
FT8 decoder makes up to three attempts at decoding, each doing up to three
passes. Each attempt subtracts signals from prior attempts to reveal masked
signals. There is no sorting or randomizing across the attempts, the
overriding priority being to print he decodes as soon as possible after they
are discovered.

Well that still favors the stronger stations. Was "calling at lower
offset" something people were really rushing for, or did that have any
bias towards them in contests or crowded bands?
 
What I wanted sometimes was a "favor callers *not* on my tx
frequency". (But that's probably an unrelated thing to this change.)
 
Another plus of the old ordering was that you could see the three
passes and say "hey look it decoded this one because it subtracted a
stronger signal first". The new ordering seems to be pretty messy
instead.
 
Christoph

Hi Christoph,

yes stronger signals may well be decoded on an earlier pass, but we cannot deal 
with that without delaying the printing of any decodes until all decodes 
attempts are completed, that would be very counterproductive given one feature 
of the latest decoder is there to yield decodes before all transmissions are 
completed. We could of course sort decodes continuously as they flow in, but 
that would make the UI very confusing with decodes continuously shuffling just 
as you are trying to read them. There is no optimal solution.

73
Bill
G4WJS.

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