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Re: [Discuss-gnuradio] ofdm_benchmark_tx.py on E100 results in sequence

From: Morgan Redfield
Subject: Re: [Discuss-gnuradio] ofdm_benchmark_tx.py on E100 results in sequence error in burst
Date: Tue, 23 Aug 2011 18:36:18 -0700

On Tue, Aug 23, 2011 at 5:58 PM, Philip Balister <address@hidden> wrote:
On 08/23/2011 05:15 PM, Morgan Redfield wrote:
Hi everyone,

I updated the ofdm_benchmark_tx.py script to use UHD and I'm running it on
my E100. If I run it at a high enough sample rate, I get a lot of "S"
characters printed to the screen. Some googling shows that this means
there's packet loss within a burst. What causes this? Is there any way to
avoid it?

Also, what kernel version are you running? Have you updated the boot files and root file?


The updated flowgraph is here: https://github.com/mogar/uhd_ofdm/blob/master/benchmark_ofdm_tx.py

I'm trying to run it with an fft-length of 1024 and 700 occupied tones. I'm using a sample rate of 4Msps.

My E100 has a kernel version of 2.6.38. I'm using fftw optimized for NEON from Vesperix, which was posted to this list a month or so ago. I haven't updated any of the boot or root files for a couple of months, I don't think I'm on the most recent version.

The usrp_e module has the following version information:
version:        0.2
srcversion:     C95640F14A5715ACE28E715


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