[Discuss-gnuradio] Idea of a USRP UHD block that fills gaps in transmission from USRP

2014-02-09 Thread Perper
Hi all, Interruptions transmission over Gigabit Ethernet when receiving samples from USRP can happen at highest data rates no matter how many tricks you use with your network card (I have experience with N200/N210). The loss of part of the signal results with synchronization loss in data transmis

Re: [Discuss-gnuradio] psk mod and channel model

2014-02-09 Thread Tom Rondeau
On Sat, Feb 8, 2014 at 11:32 AM, Marco Bosco wrote: > Hi! > > I am trying to do a simple simulation in GRC: > > Signal source --> Packet encoder --> PSK mod --> Channel model --> PSK demod > --> Packet decoder --> Scope sink > > The problem is that it works only if I enable differential encoding.

[Discuss-gnuradio] pfb_decimator_ccf(13): insufficient connected input ports (5 needed, 1 connected)

2014-02-09 Thread JIANG Pin A
Hi, all I try to re-structure the osmo-tetra to work with GNU Radio 3.7. The osmo-tetra is based on GNU Radio 3.6. The original code has tuner, resampler, demodulater three modules which connected sequentially. The resampler is based on function pfb_decimator_ccf whi

[Discuss-gnuradio] buffer taps

2014-02-09 Thread MHMND Herath
Dear sir I want to implement a buffer. How can I do it? Can I use taps. I wrote it as a queue. first queue.push(); then take queue.front() to remove queue.pop() But i create a segmentation fault (core dumped) Can you explain why? And how to implement queue in a c++ processing block Thanks Neil

Re: [Discuss-gnuradio] gr_modtool makexml bugs

2014-02-09 Thread Martin Braun
On 08.02.2014 23:38, Activecat wrote: Dear guru, This happens intermittently. Is this a bug? Probably. That said, makexml is the most tricky part of modtool. This might be triggered by invalid code, although the error message suggests otherwise. Can you please post GNU Radio version, the in

Re: [Discuss-gnuradio] buffer taps

2014-02-09 Thread Martin Braun
On 09.02.2014 08:37, MHMND Herath wrote: Dear sir I want to implement a buffer. How can I do it? Can I use taps. I wrote it as a queue. first queue.push(); then take queue.front() to remove queue.pop() But i create a segmentation fault (core dumped) Can you explain why? And how to implement

Re: [Discuss-gnuradio] pfb_decimator_ccf(13): insufficient connected input ports (5 needed, 1 connected)

2014-02-09 Thread Martin Braun
On 09.02.2014 07:39, JIANG Pin A wrote: Hi, all I try to re-structure the osmo-tetra to work with GNU Radio 3.7. The osmo-tetra is based on GNU Radio 3.6. OK, don't know about osmo-tetra but... RuntimeError: pfb_decimator_ccf(13): insufficient connected input ports (5 needed, 1 co

[Discuss-gnuradio] time interval

2014-02-09 Thread Marco Bosco
Hi all! I have the following flowgraph with a sample rate = 32k : Random source --> Throttle --> uchar to float --> scope sink If a zoom in the plot I can see that the time interval between each sample is 40 us. How can I compute this value? Marco.

[Discuss-gnuradio] Issue with Arch Linux build of gnuradio

2014-02-09 Thread Jordan Johnson
*Traceback (most recent call last): File "/home/ushio/top_block.py", line 13, in from grc_gnuradio import wxgui as grc_wxguiImportError: cannot import name wxgui* So, I have been using a downgraded version of GNURadio for some time to prototype, but now wo

[Discuss-gnuradio] QT GUI Frequency Sink CPU usage

2014-02-09 Thread Jim Larsen
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, Xubuntu 13.10, on a MacBook with 2.4 Ghz Intel dual core CPU. QT GUI Frequency Si

Re: [Discuss-gnuradio] gr_modtool makexml bugs

2014-02-09 Thread Activecat
Dear Martin, Let's refer related files as attached, thanks. List of attached files: integer_source.h integer_source_impl.h integer_source_impl.cc error_message (text file) Regards, activecat On Mon, Feb 10, 2014 at 1:19 AM, Martin Braun wrote: > On 08.02.2014 23:38, Activecat wrote:

Re: [Discuss-gnuradio] UHD stream tagging

2014-02-09 Thread Marcus D. Leech
On 02/08/2014 02:37 PM, Price, Nathan D. (S&T-Student) wrote: Hello, I'm working on project in gnuradio, in which I'm trying to toggle on and off the transmission from the USRP. After much research, I learned this was done by tagging the first sample of a transmission with "tx_sob" and the las

[Discuss-gnuradio] Why does Airprobe no longer work with current GNU Radio?

2014-02-09 Thread zhenhua han
Hi all, I'm new here to use GNU Radio. And I'm trying to decode GSM signal with airprobe. In GSoC page of GNU Radio, I found these words: "It no longer works with current GNU Radio versions, and doesn't make use of any of the new GNU Radio features." What are the detailed reasons? Moreover, wha

Re: [Discuss-gnuradio] Why does Airprobe no longer work with current GNU Radio?

2014-02-09 Thread Marcus D. Leech
On 02/09/2014 09:11 PM, zhenhua han wrote: Hi all, I'm new here to use GNU Radio. And I'm trying to decode GSM signal with airprobe. In GSoC page of GNU Radio, I found these words: "It no longer works with current GNU Radio versions, and doesn't make use of any of the new GNU Radio features

Re: [Discuss-gnuradio] Why does Airprobe no longer work with current GNU Radio?

2014-02-09 Thread JIANG Pin A
Hi, I met the same problem with airprobe and GNU Radio 3.7. I think it’s due to GNU Radio 3.7 is restructured, which leads the airprobe no longer work with GNU radio. You may try GNU Radio 3.6 series. For changes and new features in 3.7, you can check the release not

Re: [Discuss-gnuradio] time interval

2014-02-09 Thread Martin Braun
On 09.02.2014 12:28, Marco Bosco wrote: Hi all! I have the following flowgraph with a sample rate = 32k : Random source --> Throttle --> uchar to float --> scope sink If a zoom in the plot I can see that the time interval between each sample is 40 us. How can I compute this value? Time betwe