[Discuss-gnuradio] Avoid "U"nderflow Techniques

Goodmorning Community, In the following situation | Software | |RF| | Code | ---> |Front End | | | |(Sample_Rate) | Underflow occurs when the software code does not provide samples at a constant rate as required by the RF-Front End. The known solution, abl

Re: [Discuss-gnuradio] Problem with RX OFDM through the network

Hi Andy,  first of all, thanks for you reply. I'd start simple. Use the lastest gnuradio with the fixed gr-zeromq  blocks. Just put in 1 PUSH/PULL pair; not the 4 or 6 pairs you have  now.  The version installed in the machines is the 3.7.9.  As for the number of pairs, even if I use the original

[Discuss-gnuradio] how does Doppler shift increment in flat fading channel GNU radio

Hello, The question is about how does the given Doppler shift progress, or how is the Doppler induced phase shift implemented. I select a simple frequency selective fading block and feed in it some gr_complex(1, 0) values. For simplicity I run one fader (num of sinusoids). in file: https://git

Re: [Discuss-gnuradio] how does Doppler shift increment in flat fading channel GNU radio

Hi, I posted a question about the very same lines of code four days ago, but did not get a reply yet http://lists.gnu.org/archive/html/discuss-gnuradio/2016-02/msg00254.html I’m not sure whats going on there, but some w

Re: [Discuss-gnuradio] Avoid "U"nderflow Techniques

Simone, first of all, FIFOs of this sort already exist (both on the device and in host, in form of the buffer between the upstream block and the USRP block). Now, if you're SW is too slow, your FIFO will always run out of samples and eventually you'll have U's again. This can only help to avoid t

Re: [Discuss-gnuradio] QPSK demodulation using GRC constellation decoder not working

You're not resolving the \pi/2 ambiguities. I guess that's what's wrong here. Cheers, M On 02/20/2016 03:33 PM, Damindra Bandara wrote: > Hi, > > I am trying to transmit and receive a file using Ettus USRP and GNU > Radio Companion. The modulation scheme used is QPSK. I followed the "gnu > radio

Re: [Discuss-gnuradio] Problem with RX OFDM through the network

Maicon, just checking here: Do you understand the full design of the rx_ofdm and tx_ofdm flow graphs? Also, you never want to limit the number of items. The Random Source does not get prioritized, it simply will produce data until its output buffer is filled. Because there can never be more data c

Re: [Discuss-gnuradio] how does Doppler shift increment in flat fading channel GNU radio

Hi, (I was not in the mailing list for a long time) yes, you are right. d_m is incrementation or index after initialization, which is correct thing there. Yes, as you also said that is per sample. cos(alpha_n) is constant there, I checked that. cos table looks like just cosine values, which mus

Re: [Discuss-gnuradio] how does Doppler shift increment in flat fading channel GNU radio

Hi, > On 22 Feb 2016, at 10:54, Nasi wrote: > > d_m is incrementation or index after initialization, which is correct thing > there. This is what I don’t get. d_m is the absolute sample index. Let’s say you have a slight change in Doppler Frequency, then, from the first to the second sample

[Discuss-gnuradio] gnuradios place in the state of the art of SDR

Hello, I am just starting to get into the world of SDRs, and i have been looking for information about SDRs state of the art, and this is when i found GNURadio and SDRsharp as the top contenders. I know that i am writing to the gnuradio mailing list so i wont talk about its competitors, but can so

Re: [Discuss-gnuradio] gnuradios place in the state of the art of SDR

Hi Mabel, SDRsharp and GNU Radio are fundamentally different. SDRsharp is a single-purpose application for reception of a single class of signals. GNU Radio is a framework for developing SDR and other DSP applications. You should really read our intro to GNU Radio to get a feeling for things [1]!

[Discuss-gnuradio] Expresscard

Is there any GNURadio-compatible hardware that fits in an expresscard/54 slot? ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Re: [Discuss-gnuradio] gnuradios place in the state of the art of SDR

Mabel, I am kind of confused as to what you mean by "state of the art". I personally would consider any SDR to be pretty state of the art; it has been around for some years, but it is by no means common place. Being unfamiliar with SDRsharp, a quick google search and read through of their websit

Re: [Discuss-gnuradio] Expresscard

What kind of hardware are you referring to? Generally, the Ettus USRP X3x0 can be connected via a special external PCIe cable through an expresscard adapter, but that's kind of a costly thing if you don't need that much bandwidth. Also, Expresscard carries USB lines, too, and there's many USB sof

[Discuss-gnuradio] uhd_fft.grc: fifo ctrl timed out looking for acks

Hello, I have the following system configuration: Ubuntu 14.04, 64-bit, 3.17.0-lowlatency Gnuradio v3.7.8 and a USRP N2930, with UHD_003.009 version installed. The script uhd_find_devices works properly and the output of uhd_usrp_probe is the following: https://drive.google.com/file/d/0B9y0kqNk

Re: [Discuss-gnuradio] uhd_fft.grc: fifo ctrl timed out looking for acks

Hello Maria, the reason I most often encountered for this is that in the middle of operation, Ubuntu decided to reconfigure the network interface. Make sure you set the network interface to a valid address from the 19.168.10.XXX network (except .2), and configure the network manager for "static" a

Re: [Discuss-gnuradio] gr-channel: adding ETSI/3GPP channel model taps

Hi, I’m working on something similar. I’m also trying to map channel parameters to input parameters for the gr-channel blocks and validate the results. I wondered whether there were any news on that and whether the python code is available somewhere. Best, Bastian > On 30 Dec 2015, at 02:33,

Re: [Discuss-gnuradio] uhd_fft.grc: fifo ctrl timed out looking for acks

Marcus, Just so that Maria doesn't get too confused, I think you meant: > 192.168.10.XXX network (except .2), and configure the network manager for > "static" addressing. Greg > On Feb 22, 2016, at 4:53 PM, Marcus Müller wrote: > > Hello Maria, > > the reason I most often encountered for thi

[Discuss-gnuradio] (no subject)

OK, I was dumb enough to do upgrades to my Ubuntu 15.1. I had UHD and grc running nicely, with B200, and suddenly, after update, : djl@CRUNCHER4:~$ grc -s Generic Colouriser 1.9 grc [options] command [args] Options:") -e --stderrredirect stderr. If this option is selected, do n

Re: [Discuss-gnuradio] (no subject)

On 02/22/2016 09:47 PM, Don Latham wrote: OK, I was dumb enough to do upgrades to my Ubuntu 15.1. I had UHD and grc running nicely, with B200, and suddenly, after update, : djl@CRUNCHER4:~$ grc -s Generic Colouriser 1.9 grc [options] command [args] Options:") -e --stderrredirect stderr. If t

[Discuss-gnuradio] grc

So, per my last, apparently anybody can just assign a name to anything regardless of previous use? I was able to run gnuradio GRC by using an already saved grc example. So I guess there is a way around the problem. thanks. No more updates! -- Felix qui potuit rerum cognoscere causas. Lucky is

Re: [Discuss-gnuradio] grc

On 02/22/2016 09:59 PM, Don Latham wrote: So, per my last, apparently anybody can just assign a name to anything regardless of previous use? I was able to run gnuradio GRC by using an already saved grc example. So I guess there is a way around the problem. thanks. No more updates! Actually, t

Re: [Discuss-gnuradio] uhd_fft.grc: fifo ctrl timed out looking for acks

Indeed! Thanks for jumping in! Am 23. Februar 2016 00:04:10 MEZ, schrieb Gregory Ratcliff : >Marcus, > >Just so that Maria doesn't get too confused, I think you meant: >> 192.168.10.XXX network (except .2), and configure the network manager >for "static" addressing. > >Greg > >> On Feb 22, 2016, a