On Thu, Nov 7, 2013 at 7:57 AM, Martin Braun (CEL) <martin.br...@kit.edu>wrote:
> On Wed, Nov 06, 2013 at 06:27:40PM -0500, Aditya Dhananjay wrote: > > I created an OFDM TX/RX flowgraph (mostly copying stuff out from the GNU > Radio > > reference GRC implementation), where the TX goes out to a USRP UHD sink, > and > > the RX reads from a USRP UHD source. > > > > As long as the receive SNR is high enough, the problem does not show up. > > However, as I gradually reduce the RX gain, at some point, the entire > thing > > crashes with the "Buffer too small for min_noutput_items" error. > > Are you using a current version? This problem was caused by bit errors > creating incorrect, but validated headers. In the current header, we > have an 8 Bit CRC check, which is pretty unlikely to cause this. > Hi Martin, Thanks for your response. Yes, I am using the current version pulled from the git sources. To clarify, this is not a rare occurrence. With a > 50% probability, when I reduce the TX/RX gain, the problem shows up. The header/payload demux is always the offending block. Also, once this problem shows up, the entire RX path freezes up, and needs to be restarted. Best, Aditya
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