Multiple parallel "XOR gates" doing 'de-modulation'
(de-spreading) each with it's own 'code' - much like
a GPS receiver does it (although they do this in
software nowadays ... sounds like a good job for one
of TI's more powerful DSP's intended for cellular/PCS
base station use!

RF Jim


----- Original Message -----
From: "Jonathan Johnson" <jonathan@OUTEREDGE.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, November 12, 2002 6:39 AM
Subject: [EE] Spread spectrum receiver/DSP problem


> Does anyone on list know how one would go about decoding multiple channels
> on a spread spectrum receiver? with different spreading codes for each
> channel but all being decoded by the one receiver?
> e.g. for a system that has  lets say 50 available spreading codes to be
used
> for diff channels, I want a receiver to be able to decode a number of
these
> simultaneously for instance channels 3,7,23,32,47.(not necessarily 5
> channels)
> The data for each channel could be output in a number of ways either with
> each packed added a channel id number to the end of it or thru different
I/O
> lines.
> I imagine this would entail some MAJOR signal processing. I don't know
> personally but this sort of  sounds like what a cellular base station does
> with multiple channels.
>
> You used to be a cellular guy didn't you Jim? have you any pointers etc
> where I could learn a bit about the techniques involved?
>
> No pointers or info will be turned down, I have no idea other than what I
> described above.
>
>
> Cheers
>
> Jonathan
>
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