[Discuss-gnuradio] gri_mmse_fir_interpolator_cc::interpolate returns NaN

2010-06-22 Thread Kyle Zhou
I am testing the gr_mpsk_receiver_cc module using the code attached at the end. It is gnuradio v3.3.1git-11-ge20160b7 on cygwin 1.7.5-1 with gcc 3.4.4. When I run the code, the following error pops up: === assertion "imu >= 0" failed: file "gri_mmse_fir_interpolator_cc.cc"

Re: [Discuss-gnuradio] usrp_benchmark_usb.py failed max speed

2010-06-22 Thread Eric Blossom
On Tue, Jun 22, 2010 at 03:09:57PM -0400, William Cox wrote: > > > > > > usrp_benchmark_usb.py is not particularly reliable as a benchmark per > > se. But, in general, if your system can't keep up with the usrp then > > you'll lose packets. Reducing the bandwidth is one way to prevent that > > from

Re: [Discuss-gnuradio] Synchronising USRP2's in GRC.

2010-06-22 Thread Zohair
h, I am using two computers to do my work, one of them has gnuradio 3.3 and the other has 3.3.1. In the later, there are some options in the USRP2 source blocks: Clock source: - internal - external SMA - external MIMO I think I should use one of these, but don't know how. Any help or explan

Re: [Discuss-gnuradio] usrp_benchmark_usb.py failed max speed

2010-06-22 Thread William Cox
> > > > usrp_benchmark_usb.py is not particularly reliable as a benchmark per > se. But, in general, if your system can't keep up with the usrp then > you'll lose packets. Reducing the bandwidth is one way to prevent that > from happening. > > Thomas > Thomas, How would you recommend going about

Re: [Discuss-gnuradio] FEC

2010-06-22 Thread William Cox
What's your received signal power? For instance, this guy (no idea if he's right) shows simulated GMSK BER curves with a 5e-3 BER anywhere from 8db - 14db depending on the bandwidth-time product: http://iaci.unq.edu.ar/materias/telecomunicaciones/archivos/infoadicional/esquemas_de_modulacion_digita

Re: [Discuss-gnuradio] Miller/Delay decoding

2010-06-22 Thread Achilleas Anastasopoulos
Dora, you can describe Miller encoding with an FSM with 2 states 2 inputs and 4 outputs. Once you do that both encoding and decoding can be done easily using the gr-trellis framework. Achilleas ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu

Re: [Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 91, Issue 21

2010-06-22 Thread Tuan Ta
That's precisely where it is. Don't know how I missed it. Thanks a lot. Johnny On Tue, Jun 22, 2010 at 4:00 PM, Thomas Tsou wrote: > On Tue, Jun 22, 2010 at 12:28 PM, Tuan Ta wrote: > > Hi all, > > > > This question might be a little bit off-topic but going through the code > on > > the transm

Re: [Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 91, Issue 21

2010-06-22 Thread Thomas Tsou
On Tue, Jun 22, 2010 at 12:28 PM, Tuan Ta wrote: > Hi all, > > This question might be a little bit off-topic but going through the code on > the transmission side, I didn't see CRC method got invoked anywhere. Though > I did see that the CRC got removed and checked in the receiving side. I'd be >

Re: [Discuss-gnuradio] FEC

2010-06-22 Thread Thomas Tsou
On Tue, Jun 22, 2010 at 10:15 AM, Jakub Moskal wrote: > Hi, > > I'm using the digital/benchmark_*.py from the GIT repository and am > getting a very low ratio of corrupt packets, usually under 0.5%. I use > the default gmsk modulation, USRP1's with RFX2400 and run the > benchmark with a frequency

[Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 91, Issue 21

2010-06-22 Thread Tuan Ta
Hi all, This question might be a little bit off-topic but going through the code on the transmission side, I didn't see CRC method got invoked anywhere. Though I did see that the CRC got removed and checked in the receiving side. I'd be grateful if anyone can give me a pointer. Thanks, Johnny O

[Discuss-gnuradio] FEC

2010-06-22 Thread Jakub Moskal
Hi, I'm using the digital/benchmark_*.py from the GIT repository and am getting a very low ratio of corrupt packets, usually under 0.5%. I use the default gmsk modulation, USRP1's with RFX2400 and run the benchmark with a frequency of 2.4G. Would this low ratio suggest that the FEC is being applie

Re: [Discuss-gnuradio] usrp_benchmark_usb.py failed max speed

2010-06-22 Thread Thomas Tsou
On Tue, Jun 22, 2010 at 11:15 AM, wrote: > Hello everyone, > > When I run usrp_benchmark_usb.py, the two fastest tests fail, leaving me > with 8 MB/sec maximum. I have two questions: > > First, how do I get the 16MB and 32MB tests to pass? Do I need a faster CPU? Perhaps. What type of system are

[Discuss-gnuradio] Modulation scheme change on fly

2010-06-22 Thread Jakub Moskal
Hi, I would like to be able to change modulation scheme and other parameters on the fly, from within a separate process. I'm using a modified version of the tunnel.py from the GIT repository, which instead of forwarding the packets to/from TUN/TAP device, acts as a CORBA server with registered cal

[Discuss-gnuradio] usrp_benchmark_usb.py failed max speed

2010-06-22 Thread jonshan
Hello everyone, When I run usrp_benchmark_usb.py, the two fastest tests fail, leaving me with 8 MB/sec maximum. I have two questions: First, how do I get the 16MB and 32MB tests to pass? Do I need a faster CPU? Second, supposing I can't get a faster system, what is the consequence of having a sl

[Discuss-gnuradio] Re: grc 0.70 version

2010-06-22 Thread Josh Blum
There was a window of opportunity where, for about a year, the grc that came bundled with gnuradio would convert the old format. If you go back in time, about a year and a half ago, and checkout the svn trunk, install, the grc can convert. I am not sure if this capability made it into the 3.2 r

Re: [Discuss-gnuradio] Setting tx_gain > 20 dB => no effect? (USRP2, XCVR2450)

2010-06-22 Thread Jeffrey Lambert
On 6/22/2010 5:34 AM, Sven Oliver Kreis wrote: Hi Josh, thanks a lot. You were right. I ran another test with amp 0.1 and this time it changed above 20 dB. Seems saturated. The sample mismatch is on purpose. My real purpose is to jam Zigbee communication between micaz nodes. So I don't need a

[Discuss-gnuradio] RE: grc 0.70 version

2010-06-22 Thread fangming he
Hi, Josh Can I load *.grc.xml file when I using the GRC that comes bundled with gnuradio?I tried it, but it seems that I cannot load *.grc.xml file Thanks! Fangming > Date: Tue, 22 Jun 2010 09:01:54 -0700 > Subject: Re: grc 0.70 version > From: j...@joshknows.com > To: fangmin...@hotmail.com > C

[Discuss-gnuradio] Re: grc 0.70 version

2010-06-22 Thread Josh Blum
GRC 0.7 and previous does not generate code. You need to use a version of GRC that comes bundled with gnuradio. http://gnuradio.org/redmine/wiki/gnuradio/GNURadioCompanion -Josh 2010/6/22 fangming he : > Hi, ALL > Did anyone who usd GRC 0.7 version? > I try to find the function of generating pyt

[Discuss-gnuradio] usrp_spectrum_sense.py

2010-06-22 Thread Carlo D'Elia
Hi all, I'm new in this world... but I'm trying to understand the program usrp_spectrum_sense.py. I want to know how many samples my usrp capture at a given time period. It should theoretically capture in n seconds--> USRP_RATE x n seconds. For example in 10 seconds => 4 MS/s x 10s =

[Discuss-gnuradio] grc 0.70 version

2010-06-22 Thread fangming he
Hi, ALL Did anyone who usd GRC 0.7 version? I try to find the function of generating python code, but I failed. Anyone who can tell me where I can find the python code it generated? Or how to enable the function of generating code? Or some other solutions? Best

[Discuss-gnuradio] Miller/Delay decoding

2010-06-22 Thread Dora Pa
Hi list! I'm wondering if anybody has already written a block do decode Miller encoded signals? I currently trying to implement this myself but i got stuck and have no idea if the code I've written so far is correct (dsp beginner :) ). Thanks in advantage. Dora Pa ___

Re: [Discuss-gnuradio] Setting tx_gain > 20 dB => no effect? (USRP2, XCVR2450)

2010-06-22 Thread Sven Oliver Kreis
Hi Josh, thanks a lot. You were right. I ran another test with amp 0.1 and this time it changed above 20 dB. Seems saturated. The sample mismatch is on purpose. My real purpose is to jam Zigbee communication between micaz nodes. So I don't need a very smooth sinus, but a strong signal which di

[Discuss-gnuradio] Active RADAR minimum pulse

2010-06-22 Thread Jeffrey Lambert
Hello to all, I am working on what approximates an active RADAR for the interrogation of a temperature sensitive microwave resonator. For this project, I will be using GNU Radio libraries and a USRP 1 device. In my research, I have discovered some issues that might pertain to this project in