Date: Sun, 6 Mar 2011 22:39:10 +0000 From: Bruce Cran <bruce@cran.org.uk> To: Adrian Chadd <adrian@freebsd.org> Cc: erob@gthcfoundation.org, freebsd-chat@freebsd.org Subject: Re: can somebody explains OFDM in FreeBSD? Message-ID: <20110306223910.0000745d@unknown> In-Reply-To: <AANLkTikopx8kmjQGgkaG%2BzE5P8GXehJdQaj462hBr6nn@mail.gmail.com> References: <4D73BB23.8020806@gthcfoundation.org> <201103061758.47368.hselasky@c2i.net> <4D73C223.8040009@gthcfoundation.org> <201103061836.39151.hselasky@c2i.net> <4D73F1D2.4000208@gthcfoundation.org> <AANLkTikopx8kmjQGgkaG%2BzE5P8GXehJdQaj462hBr6nn@mail.gmail.com>
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On Mon, 7 Mar 2011 05:00:42 +0800 Adrian Chadd <adrian@freebsd.org> wrote: > FreeBSD doesn't implement OFDM in the kernel. > > The various chipsets implement OFDM, not FreeBSD. > > There's no "software" OFDM. The 802.11 chipsets out there take care > of it, not FreeBSD. [moved to freebsd-chat] OFDM doesn't exist in the digital domain. The furthest you can go in software is to use the I-Q pairs that represent the modulated (baseband) data - that is, QPSK, BPSK, QAM etc. If you have a card that makes I-Q data accessible (and I suspect most wireless cards don't) then you can demodulate it using general-purpose software such as Matlab or a DSP library. -- Bruce Cran
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