[3621] in cryptography@c2.net mail archive
More on blind signal demodulation
daemon@ATHENA.MIT.EDU (Eric Blossom)
Wed Nov 11 18:00:12 1998
From: Eric Blossom <eb@starium.com>
Date: Wed, 11 Nov 1998 13:04:23 -0800 (PST)
To: pgut001@cs.auckland.ac.nz
Cc: cryptography@c2.net
In-Reply-To: <91075610509676@cs26.cs.auckland.ac.nz>
Peter Gutmann writes:
> There's at least one firm which makes this stuff commercially, their products
> are available via http://www.appsig.com/prods/index.html. This looks like a
> one-stop ECHELON shop: you take one or more of their products (pick your type,
> intended target, and budget), plug as many E1's or E3's or whatever into one
> side as you can handle (the most impressive one does 16 E3's or 7680 voice/
> data channels) and all modem, fax, and voice comms going through the circuit
> are available on the other side. They have products to do automatic channel/
> signal scanning, demuxing, decoding of various data formats, processing of
> satellite and radio signals ("combines tuning, demodulation, descrambling,
> decoding, demultiplexing, and output formatting in one chassis"), every kind
> of mobile phone signal you've ever heard of, digital microwave links, decoding
> of higher-level protocols like V.42/V.42bis, X.25, HDLC, PPP, every Internet
> protocol worth doing, etc etc (their terminology is pretty neat, they have for
> example a 1.5-44.7Mbps "modem for on-the-move applications" :-). Much of the
> hardware claims to be built to TEMPEST specs. One interesting point is that
> most of their stuff is for E1's and E3's, even though they're a US company.
> Hmmm....
>
FYI, John Treichler, one of the authors of the lead paper on blind
demod in the IEEE Proceedings, works at Applied Signal. Although I'm
not sure of his exact title, I believe that he is their chief technical
person. Applied Signal does make *very* slick intercept equipment.
> PROCEEDINGS OF THE IEEE
> October 1998, Volume 86, Number 10
>
> [p. 1907]
> Practical Blind Demodulators for High-Order QAM Signals
> (Invited Paper),
> J. R. Treichler, M. G. Larimore, and J. C. Harp
