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This directory contains a work in progress service monitor for DECT
digital cordless phone base stations and handsets.
Status
------
2007 Apr 27 - Converted to new hier_block2 format
2007 Apr 03 - Development on hold.
2007 Feb 11 - Added GMSK demodulation and option to log to file
2007 Feb 10 - Able to tune and log filtered baseband to file
Files
-----
usrp_dect.py - DECT receiver application
dect_receiver.py - Top-level hierarchical block (new type) implementing
receiver
usrp_source.py - Hierarchical block (new type) implementing a USRP
complex source, with convenience functions for tuning,
gain, decimation, etc.
gmsk2.py - Hierarchical block (new type) implementing GMSK
modulation and demodulation. This will eventually go
into the core blksimpl directory
DECT Modulation Details
-----------------------
In the US, the FCC has allocated four carrier frequencies for DECT usage:
Channel Frequency
------- ---------
1 1921.536 MHz
2 1923.264 MHz
3 1924.992 MHz
4 1926.720 MHz
These are spaced at 1.728 MHz intervals.
The DECT PHY uses GMSK with a 0.5 bandwidth-time product at 1.152 Msym/sec,
for an occupied bandwidth (99% power) of 1.186 MHz (1.03 x symbol rate.)
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