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Re: [Discuss-gnuradio] Gnuradio Mode S project released

From: Nick Foster
Subject: Re: [Discuss-gnuradio] Gnuradio Mode S project released
Date: Sun, 24 Oct 2010 11:34:29 -0700

On Sun, 2010-10-24 at 19:22 +0200, Andrea Montefusco wrote:
> Nick,
> is it thinkable to operate the decoder at a lower sample rate ?
> (e.g. at 2 MS/s or even less)

Mode S operates at 1Mbit/s bit rate, and being pulse-position-modulated
the data rate is effectively 2Mchips/s. In order to guarantee at least
one sample falls reasonably close to the center of the chip you have to
sample multiple points per chip. If you could ensure somehow that your
samples were aligned with the chip centers, you could sample at 2Msps.


>        *am*
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> Andrea Montefusco iw0hdv        http://www.montefusco.com
> tel: +393356992791                     fax: +390623318709
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