Re: [Discuss-gnuradio] USRP sampling rate (was: (no subject))

Hi Gerome, I hope the subject I've added suits the topic of your mail well; if not, feel free to change it when replying)! It's kind of important to have a proper subject line, as it'll allow people to directly address your mails. > What does the sampling rate in this usrp block does? It sets

Re: [Discuss-gnuradio] VOLK: fast way to log10()?

By the way, with a bit of approximation and a little acceptance for errors in corner cases, log2 of a IEEE-754 float is simply it's exponent + log2(mantissa), with the later potentially being implementable using lookup tables. Also, VOLK does have a log2, kernel, volk_32f_log2_32f Best regards,

Re: [Discuss-gnuradio] VOLK: fast way to log10()?

This is the use case I had in mind when we were working on the log2 kernel. Binary logs are the fastest log to compute (for floating point numbers) because of Marcus' explanation. I even wrote the NEON log2 proto-kernel so that the computation can be in-lined in other kernels in the future to

Re: [Discuss-gnuradio] USRP sampling rate (was: (no subject))

You might also want to check out Jeff Long's presentation on sampling rate at the GRCon15 Intro Day: http://www.trondeau.com/grcon15-presentations#monday_Long_Sampling Video: https://www.youtube.com/watch?v=AmY7fCGTKs4 Tom On Wed, Sep 16, 2015 at 5:57 AM, Marcus Müller

Re: [Discuss-gnuradio] problems with setting up RFNoC environment within

> PyBOMBS + RFNoC is a bit iffy, you need to manually edit the uhd.lwr > file to have it build the rfnoc-devel branch. Then, it *should* work, > but I'll admit I haven't tested it myself. Martin, to wrap a bow on this, here is the steps I've taken (and redone to make sure things seem OK) and it

[Discuss-gnuradio] Problem installing gqrx

Dear all, I have gnuradio installed on my 14.04 system using PyBOMBS. Now I would like to try out gqrx but I get the error message pasted below. I have found many other with this problem on the Internet and they solve it by removing -mt from the gqrx.lwr file. However, in my gqrx.lwr file the

Re: [Discuss-gnuradio] USRP sampling rate

Note that I kept everything in terms of "real" samples when talking about sampling rates. Also, I should have made clearer the difference between rates on receive and transmit. Transmit was not addressed. For transmit, you know the clock, so you can use a sample rate of >2B for real or >1B

Re: [Discuss-gnuradio] UHD: USRP Source

Gerome, if you set a sampling rate of 4 MHz, you will have 4 MHz of usable bandwidth (complex baseband). This is how it's supposed to be. M On 16.09.2015 09:27, Gerome Jan L wrote: > Hi guys, > > Actually, that's what I thought too. If I set the UHD: USRP Source > samp_rate to 400 Msps, I

Re: [Discuss-gnuradio] VOLK: fast way to log10()?

On 15.09.2015 20:35, Marcus D. Leech wrote: > Ordinarily, one does a log10 to convert into engineering units at the > back of, for example, a power-measurement chain. > > There's usually no reason to do that in the middle of a flow-graph, > where things can stay in linear units. That's true, but

[Discuss-gnuradio] pybombs installation fails

Following the instriuctions on http://gnuradio.org/redmine/projects/pybombs/wiki/QuickStart I tried to run the installation: ./pybombs install gnuradio It appears to start up OK, but after "Loading recipes" it displays "Installing packages" and gets through several dozen of them until it

Re: [Discuss-gnuradio] problems with setting up RFNoC environment within

On 16.09.2015 06:17, Jason Matusiak wrote: >> PyBOMBS + RFNoC is a bit iffy, you need to manually edit the uhd.lwr >> file to have it build the rfnoc-devel branch. Then, it *should* work, >> but I'll admit I haven't tested it myself. > > Martin, to wrap a bow on this, here is the steps I've taken

Re: [Discuss-gnuradio] pybombs installation fails

capture the output from "./pybombs install -v -v -v gnuradio", and stick it on pastebin so we can have a look at it. It looks like pybombs is trying to recompile make and gcc and goodness knows what else... I'm curious about why it decided to do that. On Wed, Sep 16, 2015 at 9:25 AM, Mike Gilmer

Re: [Discuss-gnuradio] VOLK: fast way to log10()?

On Wed, 2015-09-16 at 12:49 -0400, mle...@ripnet.com wrote: > Sure, but if the flow-graph basically is decimated 10:1 by the time > it reaches the log10, improvements in log10 are going to have very > little impact. It is, I would assert, boldly and perhaps brashly, > that log10 operations

Re: [Discuss-gnuradio] Problem installing gqrx

Your problem is "/usr/lib/x86_64-linux-gnu/libgnuradio-osmosdr.so: undefined reference to `uhd::device::find(uhd::device_addr_t const&)'" The linker can't find UHD. I see no "-luhd" in your linker flags, so the error makes sense... I wonder why the configuration process didn't find UHD, though.

Re: [Discuss-gnuradio] problems with setting up RFNoC environment within

(accidentally sent this to the wrong mailing list the firs time, sorry) > I admit this seems a bit heath robinson (or rube goldberg for you > Americans), but thanks for the feedback and the writeup! For anyone following this, please feel free to interject if there is a smoother way to go

Re: [Discuss-gnuradio] VOLK: fast way to log10()?

On Wed, Sep 16, 2015 at 3:58 PM, Dennis Glatting wrote: > > > It would also be nice to have a VOLK kernel that multiples a vector by a > constant: > >void >volk_32f_s32f_multiply( float* vecbuffer, >const float scalar, >

Re: [Discuss-gnuradio] pybombs installation fails

Thanks guys. The output (somewhat abbreviated) is at http://pastebin.com/BqvwB58y I am running Windows 8.1 Mike On Wed, Sep 16, 2015 at 3:52 PM, Tom Rondeau wrote: > On Wed, Sep 16, 2015 at 3:48 PM, Chris Kuethe > wrote: >> >> capture the output

Re: [Discuss-gnuradio] pybombs installation fails

It's been a decade since I last played with cygwin, but under the hood pybomb can do things like "apt-get install gcc" or "rpm -i fftw-devel" - I'm trying to figure out what the command is to to get cygwin to go out and download/install some package from the internet, and how you can query what

Re: [Discuss-gnuradio] pybombs installation fails

On Wed, Sep 16, 2015 at 6:12 PM, Chris Kuethe wrote: > It's been a decade since I last played with cygwin, but under the hood > pybomb can do things like "apt-get install gcc" or "rpm -i fftw-devel" > - I'm trying to figure out what the command is to to get cygwin to go >

Re: [Discuss-gnuradio] pybombs installation fails

I'm new to this. ..are you asking me to run that install command. .. or? Mike On Sep 16, 2015 5:03 PM, "Chris Kuethe" wrote: > This is what PyBOMBS does... > > https://github.com/gnuradio/pybombs/blob/0382f9253a44135677b656ef08ba438f57f65625/mod_pybombs/sysutils.py#L393

Re: [Discuss-gnuradio] pybombs installation fails

This is what PyBOMBS does... https://github.com/gnuradio/pybombs/blob/0382f9253a44135677b656ef08ba438f57f65625/mod_pybombs/sysutils.py#L393 https://github.com/gnuradio/pybombs/blob/dc593faf9e1557133c5801fe4aa58198e34407db/mod_pybombs/recipe.py if you could do something like "cygpkg install fftw

Re: [Discuss-gnuradio] pybombs installation fails

Congratulations, you now know the most of anyone about gnuradio on windows. Most of us here seem to use some sort of linux host. PyBOMBS thinks it has to compile gcc, make, binutils, math libraries, ... because it can't find acceptable binaries. Does cygwin have some sort of command-line package

Re: [Discuss-gnuradio] VOLK: fast way to log10()?

On Wed, 2015-09-16 at 16:29 -0400, West, Nathan wrote: > On Wed, Sep 16, 2015 at 3:58 PM, Dennis Glatting > wrote: > > > > It would also be nice to have a VOLK kernel that multiples a vector > > by a constant: > > > >void > >volk_32f_s32f_multiply( float* vecbuffer,

Re: [Discuss-gnuradio] pybombs installation fails

I'm running a cygwin shell. Mike On Wed, Sep 16, 2015 at 4:33 PM, Mike Gilmer wrote: > Thanks guys. > > The output (somewhat abbreviated) is at http://pastebin.com/BqvwB58y > > I am running Windows 8.1 > > Mike > > On Wed, Sep 16, 2015 at 3:52 PM, Tom Rondeau

Re: [Discuss-gnuradio] Fwd: Re: Transmission error

Do I need to use gnuradio - companion for transmission and reception of the data packets or the benchmark_tx.py commands from the terminal would be enough for that to happen. I am unable to sort out. Kindly help. Regards, Dave On Sep 16, 2015 2:59 PM, "Rama V" wrote: >

Re: [Discuss-gnuradio] VOLK: fast way to log10()?

On 16.09.2015 13:29, West, Nathan wrote: > There is a volk_32f_s32f_multiply_32f. It doesn't operate in-place, but > almost none of the VOLK kernels do. I think it's safe to give the same > output buffer as input buffer. (I've heard that doing stuff in-place is > noticeably better, but I've never

Re: [Discuss-gnuradio] building with cmake

Marcus Leech wrote "You can put "system dependencies goo" inside every Makefile you author..." I meant to say that I would write makefiles the way gnu make recommends that just work on my system. It would be nice to hear from someone who wants to do the same on a different system and then we

Re: [Discuss-gnuradio] pybombs installation fails

Mike, Have you stepped through the procedures outlined in the following two links already: https://gnuradio.org/redmine/projects/gnuradio/wiki/CygwinInstallMain https://gnuradio.org/redmine/projects/gnuradio/wiki/CygwinGettingStarted They are dated, but still helps guide you a fair amount of the

Re: [Discuss-gnuradio] pybombs installation fails

If I understood the process better I'd be willing to help ferret out the right procedure for cygwin, but I don't think I'd be very effective at it. I'm willing to try a few suggestions though... I mean I'm sure to learn something! I wrestled with which way to go originally - figure out how to

Re: [Discuss-gnuradio] pybombs installation fails

On 16.09.2015 15:38, Chris Kuethe wrote: > I don't disagree. I'm happy to write the write, I just don't have any > cygwin machines to test with. ...PyBOMBS2 has hooks for this kind of thing. I'm trying my best to not make this become the Duke Nukem Forever of GNU Radio :) M > > On Wed, Sep 16,

Re: [Discuss-gnuradio] pybombs installation fails

I don't disagree. I'm happy to write the write, I just don't have any cygwin machines to test with. On Wed, Sep 16, 2015 at 3:34 PM, Tom Rondeau wrote: > On Wed, Sep 16, 2015 at 6:12 PM, Chris Kuethe > wrote: >> >> It's been a decade since I last

Re: [Discuss-gnuradio] pybombs installation fails

On 16.09.2015 16:58, Mike Gilmer wrote: > I wrestled with which way to go originally - figure out how to install > linux,and in theory have an easier time of gnuradio, or try the > windows procedure. A co-worker thought the windows path would be > better but these kinds of problems are exactly why

Re: [Discuss-gnuradio] VOLK: fast way to log10()?

On Wed, Sep 16, 2015 at 8:20 PM, Martin Braun wrote: > On 16.09.2015 13:29, West, Nathan wrote: > > There is a volk_32f_s32f_multiply_32f. It doesn't operate in-place, but > > almost none of the VOLK kernels do. I think it's safe to give the same > > output buffer as

Re: [Discuss-gnuradio] pybombs installation fails

Rich, I started down that path, ran into trouble (VOLK needed Cheetah or similar, etc.) and got some advice to follow the pybombs route, which generated its own trouble. Academically, of course, I think it would be great to iron out the Windows issues. As I said, if there are suggestions I'd be

Re: [Discuss-gnuradio] building with cmake

On Wed, Sep 16, 2015 at 9:04 PM, Robert Durkacz wrote: > Marcus Leech wrote "You can put "system dependencies goo" inside every > Makefile you author..." > > I meant to say that I would write makefiles the way gnu make > recommends that just work on my system. > > It

Re: [Discuss-gnuradio] pybombs installation fails

On Wed, Sep 16, 2015 at 3:48 PM, Chris Kuethe wrote: > capture the output from "./pybombs install -v -v -v gnuradio", and > stick it on pastebin so we can have a look at it. > > It looks like pybombs is trying to recompile make and gcc and goodness > knows what else...

Re: [Discuss-gnuradio] UHD: USRP Source

The Nyquist theorem says in general your sample rate equals your two sided bandwidth, i.e. Fs=10 MHz -> BW = 10 MHz. In general, your samples are complex. As soon as you restrict samples to be real in time, you cut the useable bandwidth in half. This is because real time samples imply conjugate

Re: [Discuss-gnuradio] VOLK: fast way to log10()?

Sure, but if the flow-graph basically is decimated 10:1 by the time it reaches the log10, improvements in log10 are going to have very little impact. It is, I would assert, boldly and perhaps brashly, that log10 operations almost never need to be done at "line rate", since they are an artifice

Re: [Discuss-gnuradio] Possible typos in a GRCon15 presentation?

On Wed, Sep 2, 2015 at 8:52 PM, Jeff Long wrote: > Hi Jeon, > > Here's a long-winded answer. You're correct, but I wanted to make sure the > terminology was clear. > > Tag offsets in add_item_tag() are absolute, relative to the beginning of > the sample stream, not relative