[RTTY] To dash or not to dash - the bottom line

[Kok Chen]

On Jan 26, 2010, at 10:03 AM, Kok Chen wrote:

> unless it is some maximum a priori (MAP) scheme  
> that has gone awry.

Oops, I meant "maximum a posteriori (MAP)."

http://en.wikipedia.org/wiki/Maximum_a_posteriori_estimation

MAP for RTTY has been investigated by a few people.

Alex VE3NEA had told me some time back of his use of MAP to improve the printing of RTTY contest exchanges.  His CW Skimmer program probably incorporates many of those ideas and more.

More recently, Rob KL7NA had kindly sent me a paper that he and one of his students wrote on the use of some MAP schemes for RTTY decoding.  In an email, Rob had mentioned to me that they found MAP to be of lesser impact than using linear a-priori methods such as matched filtering.

73
Chen, W7AY