Date: Sun, 06 Mar 2011 11:11:39 -0500 From: Etienne Robillard <erob@gthcfoundation.org> To: freebsd-current@freebsd.org Cc: Diane Bruce <db@db.net> Subject: Re: can somebody explains OFDM in FreeBSD? Message-ID: <4D73B23B.9030605@gthcfoundation.org>
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I'm no expert in Wifi or in FFT so I'm forwarding your reply to the list hoping someone with experience with FFT could share lights on OFDM uses of FFT functions below the 30khz range... In other words could FreeBSD be used to control the electromagnetic energy input from out-of-band VLF/ELF waves ? Thanks, On Sun, Mar 06, 2011 at 10:38:30AM -0500, Etienne Robillard wrote: > my best bet is that VLF/ELF frequencies are using FFT (Fast Fourier > Transform) algorithm to increase compression ratio of WLAN devices No. FFT has nothing to do with this. FFT is a mathematical transform. Nothing more, nothing less. > your post mentioned ELF/VLF radiation, thats electromagnetic waves the > frequency range below 30kHz. > > How should a modulation scheme (OFDM) used in the 2.4/5GHz range be > related to radiation in such a low frequency band? It is not. A modulation scheme can be used at any frequency. Nothing to do with the frequency itself. - Diane -- - db@FreeBSD.org db@db.net http://www.db.net/~db
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