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From: | Ian Holland |
Subject: | [Discuss-gnuradio] Unexplained out-of-sequence packets... |
Date: | Tue, 11 May 2010 09:24:18 +0930 |
Hi All I am coming across problems when using USRP2s with certain
decimation factors, and these problems are somewhat counterintuitive. For instance, either using our own code while simply waiting
for samples to cross a threshold (so very little computation), I find that I am
getting SSS, indicating out-of-sequence packets. This was for a decimation factor of 20. However, when I
tried a decimation factor of 10, which should have increased both the Ethernet and
the computational requirements, I no longer observed out-of-sequence packets. I tried the same sort of thing with usrp2_fft.py, trying
decimations of 10, 16, and 20. For decimations 16 and 20, I got out-of-sequence
packets within about 10 – 20 seconds, but with decimation factor 10 I saw
no out-of-sequence packets even after a few minutes. Can anybody suggest what might be going on here? Thanks Ian. |
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