[Commit-gnuradio] r5988 - gnuradio/trunk/gr-pager

[jcorgan]

Author: jcorgan
Date: 2007-07-16 11:03:07 -0600 (Mon, 16 Jul 2007)
New Revision: 5988

Modified:
   gnuradio/trunk/gr-pager/README
Log:
Added documentation.

Modified: gnuradio/trunk/gr-pager/README
===================================================================
--- gnuradio/trunk/gr-pager/README      2007-07-16 16:35:17 UTC (rev 5987)
+++ gnuradio/trunk/gr-pager/README      2007-07-16 17:03:07 UTC (rev 5988)
@@ -1,37 +1,85 @@
-This GNU Radio component implements (will implement) common radiopager
-signaling protocols such as POCSAG and FLEX.
+This GNU Radio component implements a FLEX radiopager receiver/demodulator.
 
-Current status (10/6/06):
+FLEX pager towers are between 929 MHz and 932 MHz at 25 KHz centers.
 
+Current status (7/16/07):
+
 FLEX receiving is completed except for addition of BCH error correction.
 
-pager.slicer_fb()         Accepts a complex baseband downconverted channel 
-                          and outputs 4-level FSK symbols [0-3] as bytes.
+There are three scripts:
 
-pager.flex_sync()        Accepts 4FSK symbol stream at channel rate and
-                         outputs four phases of FLEX data bits as bytes.
-                         Auto-shifts to 3200 bps as determined by received
-                         FLEX synchronization word.
-                       
-pager.flex_deinterleave() Accepts a single phase of FLEX data bits and performs
-                         deinterleaving on 256-bit blocks.  Resulting code
-                         words are error corrected using BCH 32,21 ecc (stub)
-                         and converted into FLEX data words for output.
+usrp_flex.py - Receives and displays pages from a single paging channel. To
+               work from recorded data, record from USRP with decimation 256
+              at center frequency.
 
-pager.flex_parse()       Sink block that accepts a single phase of FLEX data 
-                         words and unpacks and parses individual pages. These 
are 
-                         passed outside the data plane via gr_message's.
+    Usage: usrp_flex.py [options]
 
-pager.flex_decode()       Combines the above blocks correctly to convert
-                          from downconverted baseband to pager messages
+    Options:
+      -h, --help                          show this help message and exit
+      -f Hz, --frequency=Hz               set receive frequency to Hz
+      -R SUBDEV, --rx-subdev-spec=SUBDEV  select USRP Rx side A or B
+      -c Hz, --calibration=Hz             set frequency offset to Hz
+      -g dB, --gain=dB                    set RF gain
+      -l, --log                           log flowgraph to files (LOTS of data)
+      -v, --verbose                       display debug output
+      -F FROM_FILE, --from-file=FROM_FILE read samples from file instead of 
USRP
 
-usrp_flex.py              Instantiates USRP receive chain to receive FLEX
-                          protocol pages.  See command-line help for options.
-                         Right now this installs into $PREFIX/bin but will
-                          probably make it into gnuradio-examples.
+    Example, to receive from 931.95M (a common nationwide channel) with DBSRX 
in
+    side A of USRP:
+    
+    $ usrp_flex.py -f 931.95M -g 32 -R A
 
-aypabtu.py               Decodes FLEX pages from multiple rx channels in a 
range.
-                         Incomplete.
+      
+usrp_flex_band.py - Receives and displays pages from a 1 MHz paging band (40 
pager
+                   channels.) To work from recorded data, record from USRP with
+                   decimation 64 at center frequency.
 
+Usage: usrp_flex_band.py [options]
+
+    Options:
+      -h, --help                              show this help message and exit
+      -f Hz, --frequency=Hz                   set receive center frequency to 
Hz
+      -R SUBDEV, --rx-subdev-spec=SUBDEV      select USRP Rx side A or B
+      -c Hz, --calibration=Hz                 set frequency offset to Hz
+      -g dB, --gain=dB                        set RF gain
+      -F FROM_FILE, --from-file=FROM_FILE     Read from file instead of USRP
+      -l, --log                              log flowgraph to files (LOTS of 
data)
+      -v, --verbose                           display debug output
+
+    Example, to receive from the lower third of the pager band with DBSRX in 
side B
+    of USRP:
+    
+    $ usrp_flex_band.py -f 929.5M -g 32 -R B                                   
                                                                                
                                    
+
+usrp_flex_all.py - Receives and displays pages from entire pager band (3 MHz,
+                   120 pager channels.)  This does not work in real time due
+                  to CPU limitations, but can work from recorded USRP data. To
+                  work from recorded data, record from USRP with decimation 20 
at
+                  center frequency of 930.5M.
+
+    Usage: usrp_flex_all.py [options]
+
+       Options:
+          -h, --help                         show this help message and exit
+          -R SUBDEV, --rx-subdev-spec=SUBDEVC select USRP Rx side A or B
+          -c Hz, --calibration=Hz             set frequency offset to Hz
+          -g dB, --gain=dB                    set RF gain
+          -F FROM_FILE, --from-file=FROM_FILE Read from file instead of USRP
+          -l, --log                           log flowgraph to files (LOTS of 
data)
+          -v, --verbose                       display debug output
+
+    Example, to receive all pager channels with DBSRX in side A:
+    
+    $ usrp_flex_all.py -R A
+
+The demodulator is relatively sensitive to frequency offset and can capture a 
signal
+within 3k of the actual signal.  
+
+All three scripts take a 'calibration' parameter, which specifies the 
frequency offset
+of the daughterboard.  This causes the USRP to be tuned to the given center 
frequency
+plus the calibration offset.  For example, if your DBSRX shows 930MHz as 
930.001MHz in
+usrp_fft.py, then use '-c 1k' in the command line to automatically add this.
+
 Johnathan Corgan
address@hidden
+Corgan Enterprises LLC
address@hidden