Re: [Discuss-gnuradio] Chunks to symbols with 16 QAM modulation

Thanks Marcus, So, how can I see my constellation points with 16 QAM receiver ? Regards, 2017-07-17 12:26 GMT+02:00 Marcus Müller : > No. > > That's not going to work out, mathematically. > > Best regards, > > Marcus > > On 07/17/2017 10:29 AM, Rafik ZITOUNI wrote: > > Dear

Re: [Discuss-gnuradio] Chunks to symbols with 16 QAM modulation

Hi Rafik, I should have been a little more constructive in my last email: It's not inherently impossible to correct phase of a QAM reception using a costas loop – it's just that the GNU Radio costas loop block makes assumptions that break down for 16QAM: * The Costas loop is a phase-only

Re: [Discuss-gnuradio] Adding Attenuation in GNU radio

Ah, yeah, in that case, a power path loss of 80 dB is equivalent to an amplitude multiplication by 10^-4. Best regards, Marcus On 07/17/2017 12:17 AM, Jose Ruvalcaba wrote: Hi Marcus, Thanks for your response. I'm trying to make a channel simulator where my signal going into the USRP gets

Re: [Discuss-gnuradio] Calculate BER in WIFI 802.11p standards !

Hi, On 07/17/2017 11:06 AM, Mériem Saïdi wrote: Hi, I use 802.11 IEEE standards to code and decode a PMT message and i would like to calculate the BER between the source of information I want to encode and the same source after decoding. (see attached screen-shots below) Except that I have

Re: [Discuss-gnuradio] Debugging polar code crashes

Hi List, I created an issue for this on github [0]. I assume the bug manifested itself due to a change in GRC. Cheers Johannes [0] https://github.com/gnuradio/gnuradio/issues/1385 On 15.07.2017 04:36, Cinaed Simson wrote: Hi Johannes - I captured the output of grcc for both polar grc

Re: [Discuss-gnuradio] Chunks to symbols with 16 QAM modulation

Dear Cinaed, The costas loop works only with BPSK, QPSK and 8PSK. Is it possible to change the actual costas loop and add the 16 QAM. Best regards, 2017-07-14 0:46 GMT+02:00 Cinaed Simson : > On 07/13/2017 06:16 AM, Rafik ZITOUNI wrote: > > Dear Cinaed, > > > > But

[Discuss-gnuradio] Calculate BER in WIFI 802.11p standards

Hi, I use 802.11 IEEE standards to code and decode a PMT message and i would like to calculate the BER between the source of information I want to encode and the same source after decoding. (see attached screen-shots below) Except that I have all time a null BER ! however the "channel model"

Re: [Discuss-gnuradio] Debugging polar code crashes

Hi Johannes, thanks for this very short and informal bug report on your own software :) so, a bit of debugging from my side: gdb --args python2 $(which gnuradio-companion) (gdb) run … Trigger hangup by dragging POLAR config onto canvas … [ctrl-C] Thread 1 "python2" received signal SIGINT,

Re: [Discuss-gnuradio] Core Dump with Simple_ra and an upgraded Ubuntu system from 14.04 to 16.04 LTS today.

On 17/07/17 05:53, Marcus D. Leech wrote: On 07/17/2017 12:47 AM, John Shields wrote: Even after I re-installed pyephem (for python 2) the issue continues i.e. logger_tp undefined and malloc error. GRC is sane in that I can instantiate a USRP source and display it's FFT.

Re: [Discuss-gnuradio] Chunks to symbols with 16 QAM modulation

No. That's not going to work out, mathematically. Best regards, Marcus On 07/17/2017 10:29 AM, Rafik ZITOUNI wrote: Dear Cinaed, The costas loop works only with BPSK, QPSK and 8PSK. Is it possible to change the actual costas loop and add the 16 QAM. Best regards, 2017-07-14 0:46

[Discuss-gnuradio] GNURadio OOT vector input/output with different size

Hi to all, I want to design my own OOT module with the following I/O: 8 inputs (length of 1000 and each element is type of float) 2 outputs (length of 1000 and each element is type of float) 2 outputs (length of 4 and each element is type of float) I used general type block but I could not get

[Discuss-gnuradio] attach pre existing blocks

Hi everybody, Do you know, if it is possible to attach blocks that are available in a recent version of gnuradio (such as 3.7.12) and include them in an older version of gnuradio (such as 3.7.9). The blocks that I am interested are Protocol formatter (Async) and Multiply by Tag Value blocks.

Re: [Discuss-gnuradio] GNURadio OOT vector input/output with different size

Hi Ali, So, you want one block with: * 8 inputs, itemsize0…7 = 1000*4B = 4000B * 4 outputs, itemsize0=itemsize1=4000B, itemsize2=itemsize3=16B Correct? You need to generate two std::vector with content {4000,4000,4000,4000,4000,4000,4000,4000} and {4000,4000,16,16} respectively, and use

Re: [Discuss-gnuradio] attach pre existing blocks

You'll have to try. Chances are good. Best regards, Marcus On 07/17/2017 04:18 PM, Alex Homero Rivadeneira Erazo wrote: Hi everybody, Do you know, if it is possible to attach blocks that are available in a recent version of gnuradio (such as 3.7.12) and include them in an older version of

Re: [Discuss-gnuradio] Noobie Advice -- Installing Icons, Mime Type, and Menu Items

Hi Håkon Big thank you !! I understand that many times “instructions” are not precisely correct and may be missing pieces of code punctuations, grammar, etc. However, as an entry level person to Linux – when reading a wiki page or readme file…it is exactly these subtle missing pieces

Re: [Discuss-gnuradio] Core Dump with Simple_ra and an upgraded Ubuntu system from 14.04 to 16.04 LTS today.

On 07/17/2017 03:41 AM, John Shields wrote: On 17/07/17 05:53, Marcus D. Leech wrote: On 07/17/2017 12:47 AM, John Shields wrote: Even after I re-installed pyephem (for python 2) the issue continues i.e. logger_tp undefined and malloc error. GRC is sane in that I can

Re: [Discuss-gnuradio] Noobie Advice -- Installing Icons, Mime Type, and Menu Items

Hi Jerry, if I understand you correctly, you are trying to run the executable "grc_setup_freedesktop" from within its directory. This will require you to prefix the executable with "./". "." means your current directory, but perhaps you already knew that. :) So, instead of: $ sudo

Re: [Discuss-gnuradio] gr-howto OOT tutorial crash

Hi Vipin - If you look at the linkage of the gnuradio-runtime library, you can tell whether log4cpp was used & if it was used then you know logging was enabled. If there is no log4cpp linkage in the gnuradio-runtime library, then I'm not sure how you determined whether logging was enabled. By

[Discuss-gnuradio] Noobie Advice -- Installing Icons, Mime Type, and Menu Items

I am just starting on in both Linux and gnuradio so steep learning curve so far. I successfully built installed the latest gnuradio into my Ubuntu 16.04 LTS using PyBOMBS. All works fine from the command line. I would like the convenience of a GRC desktop icon and I read on the

Re: [Discuss-gnuradio] Core Dump with Simple_ra and an upgraded Ubuntu system from 14.04 to 16.04 LTS today.

I'd resort to making sure there's nothing old in /usr/local/lib* anymore. Basically, move every file that hasn't been created there since the recompile to a backup location, figure out what's missing after that, and rebuild. Best regards, Marcus On 07/17/2017 03:43 PM, Marcus D. Leech

Re: [Discuss-gnuradio] Core Dump with Simple_ra and an upgraded Ubuntu system from 14.04 to 16.04 LTS today.

Thank Marcuses, I will work along the lines recommended by Marcus M and let you know. While I hate to think of it, I might need to do a clean install of 16.04 LTS and start my world over - which is sub-optimal.

Re: [Discuss-gnuradio] Chunks to symbols with 16 QAM modulation

Dear Marcus, Thanks for your answer and the precious complementary information. I conclude that an implementation of QAM16's costas loop is more complicated than the existing one, i.e MPK receiver. I am trying to reuse some existing implementation with 16QAM in order to obtain something with my

[Discuss-gnuradio] GNU Radio debug with GDB

Dear all, I have an issue that appears when I'm running gdb. I obtained the following message. 0x7fcb038c6c5d in poll () at ../sysdeps/unix/syscall-template.S:81 81 ../sysdeps/unix/syscall-template.S: No such file or directory. Could you have any idea how to fix this issue? Best, --

[Discuss-gnuradio] Using the forecast() function

Hello GuysI have a block that I'm developing using python that will ultimately take in a certain amount of items and as a result, do two things: send a message to the sink block and also output a stream of 12 samples. My question is how to exactly account for this within the forecast function??

[Discuss-gnuradio] Burst Shaper Problem

Good evening all, I am completing a project and attempting to send a file through two separate USRP using gnu radio. I have managed this with File Src>Packet Encoder> GMSK Mod > USRP Sink at the TX and USRP Src>Polyphase Clock Sync >Cost as Loop>GMSK Demod >Packet Decoder>File Sink. The

Re: [Discuss-gnuradio] Debugging polar code crashes

On 07/17/2017 03:20 AM, Marcus Müller wrote: > Hi Johannes, > > thanks for this very short and informal bug report on your own software :) > > so, a bit of debugging from my side: > > gdb --args python2 $(which gnuradio-companion) > (gdb) run Cool! That's how you debug the XML code. I was

Re: [Discuss-gnuradio] Noobie Advice -- Installing Icons, Mime Type, and Menu Items

Hi Jerry, that's great! I'm glad you figured it out. You're absolutely right, things like this can indeed drive a person crazy. It's certainly driven me crazy a couple of times. I've edited the wiki, it should be fixed now :) Best regards, Håkon Vågsether 17. jul. 2017 4.44 p.m. skrev "Jerry"

Re: [Discuss-gnuradio] Chunks to symbols with 16 QAM modulation

On 07/17/2017 01:29 AM, Rafik ZITOUNI wrote: > Dear Cinaed, > > The costas loop works only with BPSK, QPSK and 8PSK. I forgot about that. You can certainly see the constellation by tapping the output of the polyphase clock. If it looks messy try reducing the output sps of polyphase clock to

Re: [Discuss-gnuradio] GNU Radio debug with GDB

On 07/17/2017 09:28 AM, Rafik ZITOUNI wrote: > Dear all, > > I have an issue that appears when I'm running gdb. > > I obtained the following message. > > 0x7fcb038c6c5d in poll () at ../sysdeps/unix/syscall-template.S:81 > 81 ../sysdeps/unix/syscall-template.S: No such file or

Re: [Discuss-gnuradio] GNURadio OOT vector input/output with different size

Hi, 1- Actually I am using the followings make(8,8,1000*sizeof(float)) make3(4,4,1000*sizeof(float),1000*sizeof(float),4*sizeof(float)) I think this should also work, shouldn't it? 2- Under the general work function I am using the followings: const float *in1 = (const float *) input_items[0]

Re: [Discuss-gnuradio] GNU Radio debug with GDB

... and that's not a problem per se. Anyway, this is a syscall, and it's unlikely that there's a problem *within* your operating system. So, the rest of the backtrace where this is from is very likely more relevant. Also, poll() might indicate this is a more or less idle thread; use `info

Re: [Discuss-gnuradio] Core Dump with Simple_ra and an upgraded Ubuntu system from 14.04 to 16.04 LTS today.

On 17/07/17 14:04, Marcus Müller wrote: I'd resort to making sure there's nothing old in /usr/local/lib* anymore. Basically, move every file that hasn't been created there since the recompile to a backup location, figure out what's missing after that, and rebuild. Best regards, Marcus

Re: [Discuss-gnuradio] csma_and_agc branch

Hello Bastian, Thanks for the quick response! I don't expect that the old csma_and_agc mod is fresh in your mind, but appreciate any help. strange errors. Any chances that you have another (old) installation > somewhere on your system? > The long version: No, I'm pretty sure that I don't.

Re: [Discuss-gnuradio] Core Dump with Simple_ra and an upgraded Ubuntu system from 14.04 to 16.04 LTS today.

Well, the good thing about installing anything that you've compiled manually into /usr/local/ is that you immediately know where your stuff with outdated linking is. Best regards, Marcus On 17.07.2017 19:26, John Shields wrote: > Thank Marcuses, > > I will work along

Re: [Discuss-gnuradio] Runtime AttributeError for custom block

Ahh, guess what. After all this time I spent debugging this issue, it turned it was a simple problem after all. It looks like I had missed including one of the .cpp files for my custom C++ block. This was causing the linker to not find one of the symbols in the generated library file. And