El 06/03/2010 8:14, theophilusofgenoa escribió: > I had the idea that a reason spread spectrum was not legal was that the use > of a psuedo-random spreading sequence lent itself to the development of an > unbreakable code (or at least a difficult to break code) that would allow > secret communications by people inimical to the good old USA. And I think > that is a valid point. > Ted Stone, WA2WQN >
In the case at hand, the key is not public, but does not stop the general reception of messages. But it does not deny that there could be other variants with a hidden key... What has not been generally so well understood is that SS has "processing gain", when the averaged signal samples add up and noise and QRM become incoherent and do not add up, by whatever method you use. That is the core of the idea, its technical strength besides the opportunity to hide content. Two aspects of the same question. 73, Jose, CO2JA
