History of Orthogonal frequency division modulation

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	Revision 11 . . (edit) December 4, 2001 8:06 am by The Anome [more linkification]
	Revision 10 . . (edit) December 4, 2001 8:03 am by The Anome [link to modems]
	Revision 9 . . December 4, 2001 7:57 am by The Anome [explained why COFDM is so great]
	Revision 8 . . (edit) December 4, 2001 7:49 am by The Anome [tweakity]
	Revision 7 . . December 4, 2001 7:48 am by The Anome [added DMT term]
	Revision 6 . . (edit) December 4, 2001 7:46 am by The Anome [bold abbrevs too]
	Revision 5 . . (edit) December 4, 2001 7:45 am by The Anome [link for digital filter]
	Revision 4 . . (edit) December 4, 2001 7:45 am by The Anome [COFDM term in bold]
	Revision 3 . . December 4, 2001 7:43 am by The Anome [Mentioned COFDM]
	Revision 2 . . (edit) December 3, 2001 2:35 am by The Anome
	Revision 1 . . December 3, 2001 2:33 am by The Anome [Created OFDM stub...]

Difference (from prior major revision) (minor diff, author diff)

Added: 6a7

Added: 9a11,22

Although highly complex, COFDM has high performance under even very challenging channel conditions.

By combining the OFDM technique with error-correcting codes, adaptive equalization and reconfigurable modulation, COFDM has the following properties:
* resistant against link dispersion
* resistant against slowly changing [phase distortion]? and fading?
* resistant against frequency response nulls and constant frequency interference
* resistant against [burst noise]?

COFDM also generally has a nearly 'white' spectrum, giving it benign electromagnetic interference properties with respect to other signals.

For these reasons, COFDM is frequently used in applications such as ADSL modems.