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From: | George Nychis |
Subject: | Re: [Discuss-gnuradio] High packet loss problem (samples dropped?) and fusb parameters |
Date: | Fri, 29 Feb 2008 15:14:13 -0500 |
User-agent: | Thunderbird 2.0.0.6 (X11/20071022) |
We're attempting to use the 802.15.4 (OQPSK) blocks that a UCLA wireless group wrote, available here:
http://acert.ir.bbn.com/projects/gr-ucla/Using file source/sinks, we can successfully encode/decode packets with absolutely no packet loss. As soon as we connect the blocks with the USRP, we experience relatively high packet loss (~2%) using coax (very high SNR, low noise). I would expect 0% packet loss, as I see using every single other modulation scheme in GNU Radio with benchmark_tx/rx.
We are generating absolutely no overrun/underrun between the transmitter and receiver, so I'm not exactly sure what could be the problem here.
Any other ideas? - George Hsin-mu Tsai wrote:
I didn't change the nice value (with top or nice, etc.). I thought enabling the real time setting (gr.enable_realtime_scheduling) in the script will automatically change priority to (max + min) /2. are 'priority' and 'nice' the same thing? Thanks, -MichaelThat all looks well-formed. Are you then running the gnuradio process with an explicit nice value? Frank -- Managing developers is like herding cats. Managing volunteer developers is like herding bats, in the dark.
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