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Article #229Re: Increasing the speed of dial-up to that of cable -- possible?
From: Jim
Date: Tue, 14 Aug 2007 23:52
Date: Tue, 14 Aug 2007 23:52
32 lines
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2613 bytes
"Radium" <glucegen1@gmail.com> wrote in message news:1187045374.227004.161110@g12g2000prg.googlegroups.com... > Hi: > > Quotes from > http://groups.google.com/group/sci.electronics.basics/msg/0c013cf5371da8dc?hl=en& > : > >>Multiple-level quadrature modulation, >>"constellation modulation", >>is most common for packing >>lots of bits per Hz of bandwidth. >>The more you pack, >>the better the s/n ratio has to be. >> >>http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation >> >>http://en.wikipedia.org/wiki/Constellation_diagram > > Does this mean that Quadrature Modulation and Constellation Modulation > can be used -- at least in theory -- to give dial-up modem connections > around the same fast speeds provided by Broadband cable modems? > > > Thanks, > > Radium > If I remember correctly, quadrature modulation was used or needed for 56k signals. Jim
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