# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=88 [Latest](https://www.ruby-forum.com/latest.md) · [Categories](https://www.ruby-forum.com/categories.md) · [Tags](https://www.ruby-forum.com/tags.md) **Page:** 89 --- ## [Re: GSoC2014 Turbo Equalizer](https://www.ruby-forum.com/t/re-gsoc2014-turbo-equalizer/239428)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [February 25, 2014, 9:51pm UTC](https://www.ruby-forum.com/t/re-gsoc2014-turbo-equalizer/239428 "2014-02-25T21:51:13Z")
Mike, there are roughly 3 ways you can parallelize these algorithms: packet-level: run a lot of codewords at the same time subblock level: divide each codeword into pieces (overlapping) and run SISOs on each one of … --- ## [QT GUI Chooser not working](https://www.ruby-forum.com/t/qt-gui-chooser-not-working/239399)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [February 25, 2014, 5:04pm UTC](https://www.ruby-forum.com/t/qt-gui-chooser-not-working/239399 "2014-02-25T17:04:29Z")
GRC v3.7.2.1-195-g19d111e2 // ubuntu 13.10 Using QT GUI range works fine, changing it to QT GUI chooser (Type = Integer) seems to fail (regardless of number of options), with the following error message: linux; GNU … --- ## [Gr::buffer::index\_add Assertion failure](https://www.ruby-forum.com/t/gr-index-add-assertion-failure/239395)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [February 25, 2014, 4:23pm UTC](https://www.ruby-forum.com/t/gr-index-add-assertion-failure/239395 "2014-02-25T16:23:50Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [HRPT receiver](https://www.ruby-forum.com/t/hrpt-receiver/239411)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [February 25, 2014, 10:38am UTC](https://www.ruby-forum.com/t/hrpt-receiver/239411 "2014-02-25T10:38:21Z")
Hello, I was wondering if someone can receive hrpt images from NOAA satellites or similar, if so, could you help me with the implementation of the receiver? There is not quite information about that format, so if yo… --- ## [\[GSoC\] We're in!](https://www.ruby-forum.com/t/gsoc-were-in/239410)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [February 25, 2014, 9:38am UTC](https://www.ruby-forum.com/t/gsoc-were-in/239410 "2014-02-25T09:38:20Z")
Hi everyone, I’m very happy to announce that GNU Radio was accepted as a mentoring org for GSoC 2014, and I’m looking forward to many great projects! Next step is the students-get-to-know-us phase. Then, starting Marc… --- ## [QT GUI Frequency Sink CPU usage](https://www.ruby-forum.com/t/qt-gui-frequency-sink-cpu-usage/239048)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [February 25, 2014, 12:44am UTC](https://www.ruby-forum.com/t/qt-gui-frequency-sink-cpu-usage/239048 "2014-02-25T00:44:07Z")
The CPU usage of the QT GUI Frequency Sink is much higher than the QT GUI Sink. I made a test flow graph with a noise source, throttle, and QT GUI Sink using default parameters. I am running GNU Radio version 3.7.0, … --- ## [Issues installing gr-ieee802.15.4](https://www.ruby-forum.com/t/issues-installing-gr-ieee802-15-4/239391)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [February 24, 2014, 9:32pm UTC](https://www.ruby-forum.com/t/issues-installing-gr-ieee802-15-4/239391 "2014-02-24T21:32:22Z")
Hii Gnu Radio, I have two installations of GR 3.65 and GR 3.7, and I installed the project ‘gr-ieee802-15-4’ using cmake -v -DCMAKE\_INSTALL\_PREFIX=~/gnuradio-3.7\_install/ then make and make install anyways when tryin… --- ## [OFDM Carrier allocator](https://www.ruby-forum.com/t/ofdm-carrier-allocator/239393)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [February 24, 2014, 7:02pm UTC](https://www.ruby-forum.com/t/ofdm-carrier-allocator/239393 "2014-02-24T19:02:52Z")
Hi there, I am trying to implement an OFDM transceiver, based on the existing GNU Radio OFDM blocks, for a cognitive communication system. How can I update the “occupied\_carriers” mapping (turn on/off carriers) while… --- ## [Gnuradio-3.6.5 test failed](https://www.ruby-forum.com/t/gnuradio-3-6-5-test-failed/239382)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [February 24, 2014, 4:23pm UTC](https://www.ruby-forum.com/t/gnuradio-3-6-5-test-failed/239382 "2014-02-24T16:23:19Z")
Ubuntu 12.04 Desktop (32-bit), intel i5 CPU, GNUradio 3.6.5 by source After running “make test”, it displayed 99% tests passed, 2 tests failed out of 239 Total Test time (real) = 92.42 sec The following tests FAILED… --- ## [Pmt memory management](https://www.ruby-forum.com/t/pmt-memory-management/239351)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [February 24, 2014, 4:21pm UTC](https://www.ruby-forum.com/t/pmt-memory-management/239351 "2014-02-24T16:21:32Z")
Hi Guys, Does copying a large pmt vector involve copying the underlying memory region or do they share a single copy (refcounted)? If the do share a single memory area, then can one thread modify the data of the vecto… --- ## [Gr-dsd?](https://www.ruby-forum.com/t/gr-dsd/239361)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [February 24, 2014, 2:59pm UTC](https://www.ruby-forum.com/t/gr-dsd/239361 "2014-02-24T14:59:07Z")
Hi, Did one of you out there have any success with gr-dsd, with the dsd grc block? Maybe some examples are available that one is willing to share? I am using the bladeRF, get no errors, but also most time noe audio o… --- ## [Simple control of wxgui application](https://www.ruby-forum.com/t/simple-control-of-wxgui-application/239356)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [February 22, 2014, 11:27pm UTC](https://www.ruby-forum.com/t/simple-control-of-wxgui-application/239356 "2014-02-22T23:27:26Z")
I have a simple python gui application (compiled from grc) that I want to control by adding some sleep statement in the main and changing some variables as it runs and then stop it. The code produced by grc looks like… --- ## [Video Streaming](https://www.ruby-forum.com/t/video-streaming/239300)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [February 22, 2014, 2:36pm UTC](https://www.ruby-forum.com/t/video-streaming/239300 "2014-02-22T14:36:50Z")
Hi I am trying to stream a video over a wireless network using UDP protocol. For that, I started tests in the following sequence: Test 1: VLC ---- VLC Test 2: VLC ---- Gnuradio (using udp source and udp sink blocks … --- ## [How does a C++ custom block kill the FlowGraph](https://www.ruby-forum.com/t/how-does-a-c-custom-block-kill-the-flowgraph/239065)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [February 22, 2014, 2:19pm UTC](https://www.ruby-forum.com/t/how-does-a-c-custom-block-kill-the-flowgraph/239065 "2014-02-22T14:19:11Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Messages get lost randomly](https://www.ruby-forum.com/t/messages-get-lost-randomly/239329)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [February 22, 2014, 2:06pm UTC](https://www.ruby-forum.com/t/messages-get-lost-randomly/239329 "2014-02-22T14:06:13Z")
Hi Guys, I am using the messaging support of basic\_block registering the message queue with message\_port\_register\_in and removed the obtained messages with delete\_head\_blocking. This block is producing streams and ev… --- ## [Segmentation fault in qa\_constellation\_receiver\_test](https://www.ruby-forum.com/t/segmentation-fault-in-qa-constellation-receiver-test/239302)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 7\ **Last updated:** [February 22, 2014, 4:13am UTC](https://www.ruby-forum.com/t/segmentation-fault-in-qa-constellation-receiver-test/239302 "2014-02-22T04:13:45Z")
After the make test failed for this module, I decided to poke around to see if there is an easy fix. I made a script that simply executes the test over and over until it seg faults and exits after the core file is cr… --- ## [Silly bug in gr\_fmdet\_cf.cc](https://www.ruby-forum.com/t/silly-bug-in-gr-fmdet-cf-cc/239330)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [February 22, 2014, 12:05am UTC](https://www.ruby-forum.com/t/silly-bug-in-gr-fmdet-cf-cc/239330 "2014-02-22T00:05:06Z")
Just came across a typo in gr\_fmdet\_cf.cc (compare to previous version to see the correct code). Line 87 currently reads: Sdot = d\_scl \* (-S0+d\_8S1-d\_8S1+S4); Note that the middle two terms are identical and therefo… --- ## [Possible bug in gr::digital::mpsk\_receiver\_cc](https://www.ruby-forum.com/t/possible-bug-in-gr-mpsk-receiver-cc/239301)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [February 21, 2014, 4:39pm UTC](https://www.ruby-forum.com/t/possible-bug-in-gr-mpsk-receiver-cc/239301 "2014-02-21T16:39:21Z")
GnuRadio 3.7.2.1 OSX 10.8.5 I was setting up a flowgraph in GRC using the mpsk\_receiver\_cc block and encountered a problem. Don’t know if it is a bug in the GRC xml or a missing method in the block code. In GRC, th… --- ## [On the fly set\_output\_multiple()](https://www.ruby-forum.com/t/on-the-fly-set-output-multiple/239283)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [February 21, 2014, 4:38pm UTC](https://www.ruby-forum.com/t/on-the-fly-set-output-multiple/239283 "2014-02-21T16:38:10Z")
Dear Sir, I need to create a interpolator block which has a callback function to change its interpolation factor on the fly. If this block is inherited from gr::sync\_interpolator, its interpolation factor cannot be c… --- ## [Piped Video Streaming Crash](https://www.ruby-forum.com/t/piped-video-streaming-crash/239317)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [February 21, 2014, 3:58pm UTC](https://www.ruby-forum.com/t/piped-video-streaming-crash/239317 "2014-02-21T15:58:44Z")
Hello all Sorry if this is a duplicate, haven’t found a thread with me specific config (no UDP). System: ubuntu 12.10 N2100 SBX GNU Radio 3.7.2.1 UHD 003.006.002-1 I have been trying to set up a video link (loop… --- ## [GR 3.7.2.1 on OSX 10.8.5](https://www.ruby-forum.com/t/gr-3-7-2-1-on-osx-10-8-5/239299)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [February 21, 2014, 3:34pm UTC](https://www.ruby-forum.com/t/gr-3-7-2-1-on-osx-10-8-5/239299 "2014-02-21T15:34:00Z")
I just upgraded my ports-installed version of GR 3.6.3 to GR 3.7.2.1 with a simple “port upgrade gnuradio”. The install went smoothly without errors and installed a working copy of 3.7.2.1 with only a few operational … --- ## [Fwd: Question Concerning Custom Modulator Block](https://www.ruby-forum.com/t/fwd-question-concerning-custom-modulator-block/239284)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [February 20, 2014, 8:40pm UTC](https://www.ruby-forum.com/t/fwd-question-concerning-custom-modulator-block/239284 "2014-02-20T20:40:50Z")
Forgot to hit reply all. On Wed, Feb 19, 2014 at 3:30 AM, Martin B. removed\_email\_address@domain.invalidwrote: 800 items (samples). Do I make sure noutput\_items is equal to number of samples I wish to I am going t… --- ## [Exceptions running dpsk\_loopback example](https://www.ruby-forum.com/t/exceptions-running-dpsk-loopback-example/239293)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [February 20, 2014, 7:58pm UTC](https://www.ruby-forum.com/t/exceptions-running-dpsk-loopback-example/239293 "2014-02-20T19:58:51Z")
Hi, I have just started learning GNU Radio by going through the examples and so far I’m impressed! I found the dpsk\_loopback example which is close to what I’m trying to build, but unfortunately it stops with an exce… --- ## [(GSoC) MIMO stuff in GNU Radio](https://www.ruby-forum.com/t/gsoc-mimo-stuff-in-gnu-radio/239242)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [February 20, 2014, 4:11pm UTC](https://www.ruby-forum.com/t/gsoc-mimo-stuff-in-gnu-radio/239242 "2014-02-20T16:11:53Z")
Hi all, I’m Zhou, a graduate student now. I’m pretty interested in MIMO systems, especially Multiuser-MIMO, since it can increase the total throughput of the network significantly. But to the best of my knowledge, the… --- ## [FM receiver doesn't work](https://www.ruby-forum.com/t/fm-receiver-doesnt-work/176795)
**Author:** [@Fatih\_Arslan](https://www.ruby-forum.com/u/Fatih_Arslan)\ **Replies:** 3\ **Last updated:** [February 20, 2014, 9:04am UTC](https://www.ruby-forum.com/t/fm-receiver-doesnt-work/176795 "2014-02-20T09:04:36Z")
Hi, We bought a new USRP motherboard with several daugtherboards. I’ totally a newbie. Our current Daugtherboards are: LFRX - LF LFTX - LF DBSRX -LF TVRX Now, if we try to run the script ./usrp\_wfm\_rcv.py we get … --- ## [Gr\_sync\_decimator(custom block)](https://www.ruby-forum.com/t/gr-sync-decimator-custom-block/239277)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [February 20, 2014, 8:36am UTC](https://www.ruby-forum.com/t/gr-sync-decimator-custom-block/239277 "2014-02-20T08:36:21Z")
Hi, I wrote a custom block to compute beamforming weights. The block takes 8 inputs and 8 outputs. It takes 64 samples from each input stream and produces 1 output in each output stream.I am not getting any output an… --- ## [Catch-22 with forecast & general\_work](https://www.ruby-forum.com/t/catch-22-with-forecast-general-work/239273)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [February 20, 2014, 8:11am UTC](https://www.ruby-forum.com/t/catch-22-with-forecast-general-work/239273 "2014-02-20T08:11:03Z")
I have a situation in which I need to read tags associated with multiple block inputs in order to decide which input to process during general\_work. In my situation it’s possible for there to be zero input available t… --- ## [Make test failure at qa\_constellation\_receiver](https://www.ruby-forum.com/t/make-test-failure-at-qa-constellation-receiver/218834)
**Author:** [@Gurdipe\_D](https://www.ruby-forum.com/u/Gurdipe_D)\ **Replies:** 25\ **Last updated:** [February 20, 2014, 7:45am UTC](https://www.ruby-forum.com/t/make-test-failure-at-qa-constellation-receiver/218834 "2014-02-20T07:45:46Z")
Hi all, Recently I have upgraded my gnuradio build to v3.5.3 on several computers, and I find that on two machines with Ubuntu 11.10, make test will fail the test qa\_constellation\_receiver while on the other two with … --- ## [Rrc\_taps filter coefficents problem in polyphase clock sync](https://www.ruby-forum.com/t/rrc-taps-filter-coefficents-problem-in-polyphase-clock-sync/239252)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [February 19, 2014, 11:06pm UTC](https://www.ruby-forum.com/t/rrc-taps-filter-coefficents-problem-in-polyphase-clock-sync/239252 "2014-02-19T23:06:03Z")
Hi, I m trying to realise QPSK trasmission shown in the tutorial of Tom Rondeau available in this link http://www.trondeau.com/storage/grcon12/rondeau-mpsk\_tutorial.pdf I meet problem when i try to add the vector of… --- ## [Different sensing results with same hypothesis](https://www.ruby-forum.com/t/different-sensing-results-with-same-hypothesis/239258)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [February 19, 2014, 8:57pm UTC](https://www.ruby-forum.com/t/different-sensing-results-with-same-hypothesis/239258 "2014-02-19T20:57:43Z")
Hello everyone, Before to explain my problem I give some technical information about my hardaware. I’m using USRPs v1 and the boards integrated are XCVR2450 Transceivers. I’m using the script usrp\_spectrum\_sense.py i… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=87) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=89)