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Questions about noise in the sense of that inevitable component of any real signal. For questions about avoiding or eliminating interference from manmade sources, use [rfi] instead.

5 votes

Are there any modes that use pseudo-random noise codes to "amplify" signals?

There are some relatively common ham radio modes that allow decoding near or below noise levels, many of the most well-known being developed by K1JT within his Weak Signal Communication Software programs … I'm not qualified to judge whether a Costas array is a "Pseudo-random noise code" but to my eye it does seem to have similarities, i.e. a pre-knowable sequence of numbers that hop around. …
natevw - AF7TB's user avatar