[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] DECT anyone?
From: |
Johnathan Corgan |
Subject: |
Re: [Discuss-gnuradio] DECT anyone? |
Date: |
Sun, 11 Nov 2007 20:10:48 -0500 |
On Sun, 2007-11-11 at 10:36 -0800, Eric Blossom wrote:
> > is anyone already working on DECT?
>
> Johnathan did a bit of work a while ago. Not sure where that code
> ended up. I thought it was in "limbo", but I didn't find it there.
I had started a receiver module in examples/python/dect, but didn't get
very far. What's there will tune to a supplied frequency, apply the
appropriate channel filter, demodulate the GMSK to (unpacked) bits, then
record to a file. I was able to "grep" the bits for DECT
pre-amble/synchronization codes and see them.
This was to be a "service monitor" type of application, not a base
station or handset. So none of the TDMA aspects were considered. We
still need (ahem) mblocks and in-band signaling to properly implement
either end of the protocol.
A base station stack that could handle a single DECT TDMA carrier would
be able to support 12 cordless phones full-duplex. Wrap it up in an
Asterisk channel driver and you have a small office cordless PBX for the
price of a USRP and PC, using entirely Open Source software.
The DECT protocols are very well documented, and the handsets are very
cheap...
--
Johnathan Corgan
Corgan Enterprises LLC
http://corganenterprises.com