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Re: [Discuss-gnuradio] OFDM on USRP2

From: Josh Blum
Subject: Re: [Discuss-gnuradio] OFDM on USRP2
Date: Tue, 18 Jan 2011 10:04:53 -0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101208 Lightning/1.0b2 Thunderbird/3.1.7

> I use two USRP2s. When the receiver is loaded with the UHD driver it
> exhibits poor performance. No matter if the sender is using the
> standard or the UHD driver.

I was under the impression that performance meant high cpu load, too
many overflows/dropped packets. I think you mean that the app with UHD
has poor reception of the OFDM packets?

If thats the case, I think UHD is ok; and perhaps this is an issue of
something gets tuned differently, or some gains get set differently, or
the issue of the drifting clock. Have you tried a external 10mhz reference?

> The buffer shouldn't be the problem:
> "Current recv sock buff size: 50000000 bytes"

ok, thats expected

> I do get that filtering warning, though:
> "Warning:
>     WBX: No tunable bandwidth, fixed filtered to 40MHz"

this is a result of calling set_bandwidth() on WBX


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