Re: [linrad] RE: Linrad

["Alexander S. Yurkov" <fitec@xxxxxxxxxxxxxxxx]

Hi, Leif and all.

On Sat, 28 Jun 2003, Leif Asbrink wrote:
> > But how linrad can know  QRN pulse realy occures in the small "time window"? 
> Oooh! Linrad has removed all strong signals first (selective limiter)
> 
> Since all pulses that have very large bandwidth will have nearly all energy in a 
> single data point (or in a pair of data points) the pulse amplitude of even a rather weak
> pulse will become very high compared to the noise floor. Any single data point that
> is much larger than the average means we have a noise pulse at this particular time.
> 
> > Or at least how it can know number of pulses in a large time window? 
> By looking at each and every sample and deciding that anything above the threshold
> (that the user may adjust) is a noise pulse.

OK. This is understandable.

> 
> There are many other interesting problems with the pulse removal procedures and I am
> sure much better algorithms will be developed in the future. Already the Linrad
> procedure works well in many cases and it allows reception of signals you can not possibly
> hear with any conventional radio:)

Anyway real noise though is not a 'theoretical Gaussian noise' and using 
processing by a software  it is posible to get much inprovement of real
signals recieving. This is why linrad seems to be very worth effort on
this topic. 


73 de RA9MB/Alex




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