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Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?
From: |
Michael Dickens |
Subject: |
Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue? |
Date: |
Tue, 21 Feb 2012 10:00:44 -0500 |
On Feb 21, 2012, at 9:44 AM, Tom Rondeau wrote:
> It's because with the larger bandwidth, the subcarriers, too, have a larger
> bandwidth. The coarse frequency correction is only set to look at so large an
> offset based on a number of subcarriers (+/-5 or 10), so now with the same
> frequency offset, 5 (or 10) carriers is a larger frequency span to check.
Ah; yes. That makes sense. My mind is thrashing with multi-thread dilemmas,
not signal processing, right now.
>> 1 MHz off at 5 GHz is 200 ppm (yes?). IIRC a reasonable spec on these
>> boards is 5-10 ppm. So, > 10x off the spec? I doubt it. My guess is it's
>> something in GNU Radio that wasn't fixed when the benchmarks were
>> transitioned from gr-usrp* to UHD.
>
> I think this is a known problem with the XCVR that has been fixed. Make sure
> you have the most up-to-date master branch of both the UHD and GNU Radio.
They were both the most recent as of yesterday. I'll update right now & see if
that helps, but I'm doubtful since none of the commits since yesterday seem to
impact the behavior of the XCVR. I'll also remove any cruft in /usr/local
before re-installing. More later. - MLD
- [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Michael Dickens, 2012/02/19
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Florian Schlembach, 2012/02/20
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Michael Dickens, 2012/02/21
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Tom Rondeau, 2012/02/21
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?,
Michael Dickens <=
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Tom Rondeau, 2012/02/21
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Michael Dickens, 2012/02/21
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Florian Schlembach, 2012/02/21
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Michael Dickens, 2012/02/21
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Tom Rondeau, 2012/02/21
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Florian Schlembach, 2012/02/21
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, Tom Rondeau, 2012/02/21
- Re: [Discuss-gnuradio] OFDM Benchmark Tx Issue?, mleech, 2012/02/21