Satellites approach the Shannon limit(physorg.com)

17 pointsby axiomvor 18 Jahren3 comments

http://www.physorg.com/news144420242.html

3 comments

soundsopvor 18 Jahren

Shannon's capacity refers to the maximum signaling speed at the physical layer but this article muddles it all up with higher levels of the network abstraction layers.

That said, I think the title is probably true. It's been known for a decade that turbo codes and low-density-parity-check (LDPC) codes can approach the Shannon limit, especially if relatively long decoding latencies are tolerable. It just took some time for turbo and LDPC codes to make into standards and get deployed.

attackvor 18 Jahren

I thought the hold-ups were patent/licensing related? Wikipedia concurs: http://en.wikipedia.org/wiki/Turbo_code

ECC's are so interesting.

rwvor 18 Jahren

Hand-waving. If I could find a link to the original publication(s) I would read that instead.