Hacker News new | ask | show | jobs
by zw123456 4419 days ago
Whenever I see something that claims to overcome a long tested theory like Shannon's law, it always makes me very suspicious. The explanations I have seen so far are long on claims and short on proof and remind me very much of "perpetual motion machines". So far nothing I have seen shows how they are "side stepping" Shannon. I smell a rat.
2 comments

This doesn't violate the Shannon capacity theorem: Different channels, like MIMO channels, have different capacities.

pCell is basically a proprietary version of network MIMO. (Though maybe still valuable if it can get to market faster).

They are sidestepping Shannon by taking advantage of spacial multiplexing.

If I'm user fiber-optic communications with 1064nm laser, there's a maximum bandwidth I can get out of a single fiber. But I can always just add more fibers.

You can do this with radio waves too. Just broadcast in such a way that a signal has maximum strength at the desired user's location, and less strength elsewhere.

You need multiple antennas, of course (like multiple fiber heads). I think if you wanted 100% bandwidth for each user, you'd need at least one antenna per user.