Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: Henry Troup Newsgroups: comp.dcom.telecom Subject: Baud per Hertz Message-ID: <8731@accuvax.nwu.edu> Date: 6 Jun 90 16:04:40 GMT Sender: news@accuvax.nwu.edu Reply-To: Henry Troup Organization: Bell-Northern Research, Ltd. Lines: 19 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 418, Message 4 of 10 In article <8683@accuvax.nwu.edu> Rob Warnock writes: >...(Pushing a 7 baud signal through a 5 Hz pipe is >quite good! The theoretical maximum is 2 baud/Hz: one state for each >half-cycle of bandwidth.)... I don't see a theoretical limit, not if you allow phase modulation. For real phase discriminators and real lines there certainly are limits, but in theory you could shift each half cycle by as fine an increment as you could measure ... I guess Heisenberg limits that somewhere, but not for a long time. Still, in the real world 7 baud on 5 Hz is very good! Henry Troup - BNR owns but does not share my opinions ..uunet!bnrgate!hwt%bwdlh490 or HWT@BNR.CA