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.)