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[Discuss-gnuradio] Final Packet(s) dropped

From: Richard Alimi
Subject: [Discuss-gnuradio] Final Packet(s) dropped
Date: Mon, 26 Mar 2007 11:13:55 -0400
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Hello All,

I am currently having a problem with packet transmission similar to the one 
Tom Rondeau had mentioned in his February 14th 2006 post titled 'Dropped 
Packets.'  However, there was no general resolution given there.

When I run the dbpsk/dqpsk/gmsk transmitter/receiver under the 
gnuradio-examples directory (revision 4796), it always seems to drop the last 
packet, leading me to believe this hasn't been fully fixed.  Using 
the --discontinuous option produces the same result.  Even adding a 
time.sleep(1) before fg.wait() doesn't seem to fix it, as suggested by that 

To be sure that all of the data was being written out to USRP when running my 
application, I put some print statements in usrp_basic_tx::write(), and the 
correct number of samples appear there (I can also verify that it is a 
multiple of 128).

At the receiving end of my application, I can observe that the received power 
drops to the level of normal background noise somewhere before the final 
packet is received.

I'm currently using the USRP (rev 4) with an RFX2400 daughtercard.  I have 
set_auto_tr(True) on both transmitter and receiver.

Has anyone experienced or been able to resolve this?


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