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Re: [Discuss-gnuradio] High packet loss problem (samples dropped?) and f

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] High packet loss problem (samples dropped?) and fusb parameters
Date: Wed, 05 Mar 2008 01:46:56 -0800
User-agent: Thunderbird (X11/20080226)

George Nychis wrote:
Maybe we can bring this thread up one more time. Michael found me on campus and I've been trying to help with this.

We're attempting to use the 802.15.4 (OQPSK) blocks that a UCLA wireless group wrote, available here:

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?

Does the code do frequency offset correction?  What about timing?


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