>>any real world test wouldn't be a discrete signal. Perhaps band-limited, because they have a clear start and stop. If they were infinite you wouldn't be able

>>any real world test wouldn't be a discrete signal. Perhaps band-limited, because they have a clear start and stop. If they were infinite you wouldn't be able to encode data as you could measure them at t=+/- infinity and retrieve all the signal information. Perhaps HN isn't the best place to have this discussion :-) >>You think these effects are more significant than noise? Group velocity dispersion in optical channels, people called it `noise` was at one point treated as noise before the appropriate transforms were worked out, I believe Infinera did this. In the case of remote sensing, ewald's limiting sphere represents a limit on the scattering meaning that you can't simply deconvolve and get better resolution.