[Commit-gnuradio] r5750 - gnuradio/branches/features/ofdm/sync/gnuradio-core/src/python/gnuradio/blksimpl

[trondeau]

Author: trondeau
Date: 2007-06-08 14:18:31 -0600 (Fri, 08 Jun 2007)
New Revision: 5750

Modified:
   
gnuradio/branches/features/ofdm/sync/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
   
gnuradio/branches/features/ofdm/sync/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
Log:
adding references for ML and PN OFDM synchonization algorithms.

Modified: 
gnuradio/branches/features/ofdm/sync/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
===================================================================
--- 
gnuradio/branches/features/ofdm/sync/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
     2007-06-08 20:10:37 UTC (rev 5749)
+++ 
gnuradio/branches/features/ofdm/sync/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
     2007-06-08 20:18:31 UTC (rev 5750)
@@ -25,6 +25,12 @@
 
 class ofdm_sync_ml(gr.hier_block):
     def __init__(self, fg, fft_length, cp_length, snr, logging):
+        ''' Maximum Likelihood OFDM synchronizer:
+        J. van de Beek, M. Sandell, and P. O. Borjesson, "ML Estimation
+        of Time and Frequency Offset in OFDM Systems," IEEE Trans.
+        Signal Processing, vol. 45, no. 7, pp. 1800-1805, 1997.
+        '''
+
         self.fg = fg
 
         # FIXME: when converting to hier_block2's, the output signature

Modified: 
gnuradio/branches/features/ofdm/sync/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
===================================================================
--- 
gnuradio/branches/features/ofdm/sync/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
     2007-06-08 20:10:37 UTC (rev 5749)
+++ 
gnuradio/branches/features/ofdm/sync/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
     2007-06-08 20:18:31 UTC (rev 5750)
@@ -26,6 +26,12 @@
 
 class ofdm_sync_pn(gr.hier_block):
     def __init__(self, fg, fft_length, cp_length, logging=False):
+        ''' OFDM synchronization using PN Correlation:
+        T. M. Schmidl and D. C. Cox, "Robust Frequency and Timing
+        Synchonization for OFDM," IEEE Trans. Communications, vol. 45,
+        no. 12, 1997.
+        '''
+        
         self.fg = fg
 
         # FIXME: when converting to hier_block2's, the output signature