[Discuss-gnuradio] memory leak problem with GNURadio/Python

2011-09-21 Thread Sanketh Kumar P
after executing a GNURadio flowgraph for sometime (typically for abt 2-3mins) the code crashes and the following message is displayed. ''' *** glibc detected *** python: malloc(): memory corruption: 0x7f7b94002b00 *** === Backtrace: = /lib/x86_64-linux-gnu/libc.so.6(+0x79d7a)[0x7f7

[Discuss-gnuradio] different CPU loads with 2 similar GRC graphs

2011-09-21 Thread Achilleas Anastasopoulos
I am comparing the following 2 systems on GRC: [source] --> [block A] --> [sink] and [source] --> [block A] -->[sink] |___^ where [block A] is a very CPU-intensive SP block, source and sink are very simple SP blocks, and neither source nor sink set the sample rate, neither

Re: [Discuss-gnuradio] status of stream tags

2011-09-21 Thread Josh Blum
On 09/21/2011 09:55 AM, Feng Andrew Ge wrote: > Josh, thanks for the information. Where can I get those few > implementations using stream tags? > If you werent following the other discussions, there is a uhd source tagging capability implemented on this branch: http://www.github.com/bistromath/

[Discuss-gnuradio] Code Modify Help on Module gr-trellis

2011-09-21 Thread SongLixing
Hi, This is Song, a phd student in Computing School of USM. I'm using GNUraido to do some research in wireless channel coding. I try to extract some useful information from trellis_viterbi and then use this information as measurement in other functions. Currently, I have successfully ge

Re: [Discuss-gnuradio] Looking for books and online courses on gnuradio?

2011-09-21 Thread Nazmul Islam
Thanks a lot for the feedback. I appreciate it. Nazmul On Wed, Sep 21, 2011 at 2:28 PM, Tom Rondeau wrote: > On Fri, Sep 16, 2011 at 4:46 PM, Nazmul Islam > wrote: > >> Hello Tom, >> >> I think that both your and Wyglinski's book uses Python code based >> examples. WINLAB has recently switche

Re: [Discuss-gnuradio] Signal Decay with USRP N210 Using BasicRX

2011-09-21 Thread Josh Blum
On 09/21/2011 12:18 PM, valentac wrote: > > So I've been doing some development and my USRP using a custom RF front end > via the BasicRX daughter board and have noticed an RC decay. I thought this > was my system, but I recently just put a signal generator directly into the > USRP and noticed t

[Discuss-gnuradio] Signal Decay with USRP N210 Using BasicRX

2011-09-21 Thread valentac
So I've been doing some development and my USRP using a custom RF front end via the BasicRX daughter board and have noticed an RC decay. I thought this was my system, but I recently just put a signal generator directly into the USRP and noticed the same thing (although not as high of a time consta

Re: [Discuss-gnuradio] GNU radio

2011-09-21 Thread Nick Foster
Andrea, Andrew, You're best off reading the source code: http://www.github.com/bistromath/gr-air-modes/ I also have a set of slides from the Gnuradio conference, but it doesn't go into detail into the decoder itself: http://www.nerdnetworks.org/~bistromath/adsb.pdf PPM is pretty straightforward

Re: [Discuss-gnuradio] Looking for books and online courses on gnuradio?

2011-09-21 Thread Marcus D. Leech
On 21/09/2011 2:38 PM, Andrew Rich wrote: What is UHd ? Sent from my iPhone Andrew Rich Stands for "Universal Hardware Driver". It's the new (15 months old now, I think) way to interface to ALL of the Ettus hardware. Prior to UHD, there were two distinct APIs -- one for USRP1, the other fo

Re: [Discuss-gnuradio] Looking for books and online courses on gnuradio?

2011-09-21 Thread Andrew Rich
What is UHd ? Sent from my iPhone Andrew Rich On 22/09/2011, at 4:28, Tom Rondeau wrote: > On Fri, Sep 16, 2011 at 4:46 PM, Nazmul Islam > wrote: > Hello Tom, > > I think that both your and Wyglinski's book uses Python code based examples. > WINLAB has recently switched to UHD recently. UHD

Re: [Discuss-gnuradio] GNU radio

2011-09-21 Thread Andrea Montefusco
Nick, could you give me a pointer to the schema of your decoder ? It seems to me that was available somewhere but I didn't manage to retrieve it. Thanks in advance *am* - Andrea Montefusco iw0hdvhttp://www.montefusco.com te

Re: [Discuss-gnuradio] Looking for books and online courses on gnuradio?

2011-09-21 Thread Tom Rondeau
On Fri, Sep 16, 2011 at 4:46 PM, Nazmul Islam wrote: > Hello Tom, > > I think that both your and Wyglinski's book uses Python code based > examples. WINLAB has recently switched to UHD recently. UHD uses C++ based > codes for the application. Is there any book that contains GNUradio examples > for

Re: [Discuss-gnuradio] GNU radio

2011-09-21 Thread Andrew Rich
Awesome thanks nick Could you talk a bit about the decode ? Do you have sort of loop ? Starting from a first sample ? Sent from my iPhone Andrew Rich On 22/09/2011, at 4:02, Nick Foster wrote: > Andrew, > > I've written a 1090MHz Mode S/ADS-B receiver for Gnuradio which can use Ettus

Re: [Discuss-gnuradio] GNU radio

2011-09-21 Thread Nick Foster
Andrew, I've written a 1090MHz Mode S/ADS-B receiver for Gnuradio which can use Ettus hardware (N200/N210, E100/E110, USRP1). It works pretty well (up to >250nm range with line of sight). I'll try to answer your questions inline below as well. On Wed, Sep 21, 2011 at 9:17 AM, Andrew Rich wrote:

Re: [Discuss-gnuradio] status of stream tags

2011-09-21 Thread Feng Andrew Ge
Josh, thanks for the information. Where can I get those few implementations using stream tags? Andrew On 09/21/2011 12:31 PM, Josh Blum wrote: On 09/21/2011 09:10 AM, Feng Andrew Ge wrote: Josh, I noticed that there are many useful commands enabled by UHD. For example, they are used in uhd/

Re: [Discuss-gnuradio] GNU radio

2011-09-21 Thread Matt Ettus
USRP N210 and SBX transceiver will give you coverage of all those bands. Matt On Wed, Sep 21, 2011 at 9:17 AM, Andrew Rich wrote: > Maybe I can list my aims and you can tell me if GNU and N200 can do this ? > > 1. Receive on 1030 MHz - BW not sure yet > 2. Receive on 1090 MHz - BW not sure yet >

Re: [Discuss-gnuradio] GNU radio

2011-09-21 Thread Andrew Rich
Maybe I can list my aims and you can tell me if GNU and N200 can do this ? 1. Receive on 1030 MHz - BW not sure yet 2. Receive on 1090 MHz - BW not sure yet 3. Receive on 2700 - 2900 MHz - BW not sure yet 4. Classify signals on these bands. 5. Perform PPM decode - Pulse Position Decode on the 109

Re: [Discuss-gnuradio] Sample fast and upload after

2011-09-21 Thread Matt Ettus
You would need to modify the FPGA to do this. However, some other people have done that and may have code available. Check the email archive on the usrp-users list. Matt On Tue, Sep 20, 2011 at 11:21 AM, wrote: > Hi all, > Is it possible with GNURadio to sample at high speed, store the sample

Re: [Discuss-gnuradio] GNU radio

2011-09-21 Thread Marcus D. Leech
On 21/09/2011 11:34 AM, Andrew Rich wrote: I was just looking at the N200 Do these hardware components have sensitivity figures ? That depends entirely on the daughterboard you chose. Although most of them have noise figures in the 4-5dB range at maximum gain. If you're just interested in RX

Re: [Discuss-gnuradio] UCLA_Zigbee_phy examples on E100

2011-09-21 Thread ziyang
Hi Josh, I tried the option 2) and 3), but didn't get the expected result. What I did was transmitting some packet data which had been modulated (O-QPSK method) from one E100 device, then observed the spectral property of the received data from the other E100 device. However, nothing "special"

Re: [Discuss-gnuradio] GNU radio

2011-09-21 Thread Andrew Rich
I was just looking at the N200 Do these hardware components have sensitivity figures ? I am interested in passive RADAR I have been using a 1090 MHz receiver and a cheap digital OSCilloscope commaned under LINUX as a capture device. I guess that is sort of what the hardware and software of a

[Discuss-gnuradio] BBN in latest GNU Radio version

2011-09-21 Thread fangming he
Hi, All, I am installing bbn for GNU Radio 3.3. However, it seems blks modules have already been moved from GNU Radio 3.2 version. Any solution for me to using BBN modules in GNU Radio 3.3? I noticed that WIFI localization module in CGRAN server is developed based on BBN in GNU Radio 3.2.2. S

Re: [Discuss-gnuradio] Help with rx_sample_to_file.cpp program and modulation scheme change in UHD

2011-09-21 Thread shantharam balasubramanian
Hi Josh, > Thanks for the email. I went through the website you mentioned and I found > there were benchmark_tx.py and benchmark_rx.py files in the gr-digital > folder. > > > We imaged the nodes using gnuradio-uhd-working.ndz. Using this image, we > see the following folders when we log in to the

Re: [Discuss-gnuradio] gnuradio component directory structure

2011-09-21 Thread Tom Rondeau
On Sat, Sep 17, 2011 at 3:14 PM, Martin Braun wrote: > I'd like to point out a disadvantage to get a discussion going: > While you're developing, this might be an inconvenience because the > files are physically separated. Most IDEs/editors have many features > such as tagging, switching from hea

Re: [Discuss-gnuradio] a question about using new block in GNURadio

2011-09-21 Thread Tom Rondeau
2011/9/19 intermilan > Hi Tom: > I used function set_history() as you advised in mu code ,and after I > tested many values, > I found that the best situation is that there would be continuous Zeros > (may be 3 or more)in my output data which made > my data is not the exactly order which I w

Re: [Discuss-gnuradio] Using Python Scientific Libraries as GnuRadio Blocks, Blks2 Help

2011-09-21 Thread Tom Rondeau
On Wed, Sep 21, 2011 at 12:26 AM, Josh Blum wrote: > > > 1:I need to ask that is there some way to make a block using Python > > Scientific Libraries e.g. scipy instead of writing in C++? > > > > Yes, I think the best way is to make a hier block w/ message source, > message sink and a thread. T