Matt_Bennett writes "Steve Perlman (Quicktime, WebTV) claimsDIDO will break through Shannon's limit by at least 100x and possibly up to 1000x. This is described in a white paper. The technology uses a centralized server to take advantage of constructive and destructive interference to distribute data to multiple users simultaneously." Link to Original Source
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"