[Discuss-gnuradio] power control when packets transmitting
Hi: My recent research project focuses on how to implement CogNet on GNUradio platform. As u know, the concept of cognitive radio is that the parameters can be adjusted according to different situations. Such as controlling power, switching freq and modulation when the packets are transmitting. But I am not sure if GNUradio platform can adjust these parameters in the middle of tranmission. I searched previous threads and found that metadata structure can do that because of pipeline transmission. Are there any ways to adjust parameters without using mblock format because I don't think mblock is mature now? I appreciate any suggestions! Thanks!! KC Huang ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] RFX900 Tx+Rx
Hi all, Does anybody know if it is possible to Tx and Rx at the same time using the RX/TX connector on the RFX900 board ? (i.e using only one connector) Thank you! ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GnuRadio on PCI-104 (i.e., Fedora on USBFlash Drive)
On Fri, May 02, 2008 at 12:54:53AM -0500, Jeff Brower wrote: William- Isn't there an issue of how much GNU radio can actually do on a Pentium M system? The Lippert board you mention looks like it's limited to 1 GHz or less with passive cooling. I assume this is a mil app, but you can use fan cooling? What will GNU radio actually be doing? FWIW, I used to use a 1.7 GHz Pentium M laptop. It ran pretty well on that. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] power control when packets transmitting
On Fri, May 02, 2008 at 08:42:41AM -0400, KC Huang wrote: Hi: My recent research project focuses on how to implement CogNet on GNUradio platform. As u know, the concept of cognitive radio is that the parameters can be adjusted according to different situations. Such as controlling power, switching freq and modulation when the packets are transmitting. But I am not sure if GNUradio platform can adjust these parameters in the middle of tranmission. I searched previous threads and found that metadata structure can do that because of pipeline transmission. Are there any ways to adjust parameters without using mblock format because I don't think mblock is mature now? Yes it can. Just call the exported interfaces for the blocks in question. On a related topic, I'll be adding an mblock-interoperable message receive method to GNU Radio blocks, so that you'll be able to thread-safely send and receive messages in GNU Radio code. The runtime system will ensure that the message receive code is only called when you're NOT in the work method. Did this answer your question? I appreciate any suggestions! Thanks!! KC Huang Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] RFX900 Tx+Rx
On Fri, May 02, 2008 at 09:48:40AM -0400, Wireless Monster wrote: Hi all, Does anybody know if it is possible to Tx and Rx at the same time using the RX/TX connector on the RFX900 board ? (i.e using only one connector) Thank you! If you mean simultaneously when you say at the same time, the answer is no. If you interleave the transmitting and receiving, then yes, you can. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] RFX900 Tx+Rx
Yes I meant simultaneously... What is the main reason for this limitation? Is possible to Tx on port 1 and Rx on port 2 simultaneously? Thanks for your help! On Fri, May 2, 2008 at 10:15 AM, Eric Blossom [EMAIL PROTECTED] wrote: On Fri, May 02, 2008 at 09:48:40AM -0400, Wireless Monster wrote: Hi all, Does anybody know if it is possible to Tx and Rx at the same time using the RX/TX connector on the RFX900 board ? (i.e using only one connector) Thank you! If you mean simultaneously when you say at the same time, the answer is no. If you interleave the transmitting and receiving, then yes, you can. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
RE: [Discuss-gnuradio] GnuRadio on PCI-104 (i.e., Fedora on USBFlash Drive)
-Original Message- From: Jeff Brower [mailto:[EMAIL PROTECTED] Sent: Thursday, May 01, 2008 11:55 PM To: Bahn, William L Civ USAFA/DFCS Cc: discuss-gnuradio@gnu.org Subject: RE: [Discuss-gnuradio] GnuRadio on PCI-104 (i.e., Fedora on USBFlash Drive) William- Isn't there an issue of how much GNU radio can actually do on a Pentium M system? The Lippert board you mention looks like it's limited to 1 GHz or less with passive cooling. I assume this is a mil app, but you can use fan cooling? What will GNU radio actually be doing? It's for an initial aerial demonstration of our keyless jam-resistant encoding. We are keeping it really, really simple. The airborne unit (the one using the Lippert board) will be toggling between running a C program that generates a waveform packet and then calling GnuRadio to broadcast that packet in the 2.4GHz ISM band using OOK. The packet will consist of nothing more than a timestamp and some additional junk data to fill out the message string. The ground station will sniff the spectrum and record and decode any packets it finds. If that goes well, then the bad guys will start jamming the spectrum and we want to see how much energy, relative to the UAV, they have to expend before they jam us - that they will jam us is not an open question, just how much energy it takes them to do so. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] power control when packets transmitting
KC Huang wrote: Hi: My recent research project focuses on how to implement CogNet on GNUradio platform. As u know, the concept of cognitive radio is that the parameters can be adjusted according to different situations. Such as controlling power, switching freq and modulation when the packets are transmitting. But I am not sure if GNUradio platform can adjust these parameters in the middle of tranmission. I searched previous threads and found that metadata structure can do that because of pipeline transmission. Are there any ways to adjust parameters without using mblock format because I don't think mblock is mature now? The easiest and quickest way to adjust power is to control the amplitude of the samples you send to the USRP. This can be done in a signal processing block and does not need m-blocks. Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GnuRadio on PCI-104 (i.e., Fedora onUSBFlash Drive)
William- -Original Message- From: Jeff Brower [mailto:[EMAIL PROTECTED] Sent: Thursday, May 01, 2008 11:55 PM To: Bahn, William L Civ USAFA/DFCS Cc: discuss-gnuradio@gnu.org Subject: RE: [Discuss-gnuradio] GnuRadio on PCI-104 (i.e., Fedora on USBFlash Drive) William- Isn't there an issue of how much GNU radio can actually do on a Pentium M system? The Lippert board you mention looks like it's limited to 1 GHz or less with passive cooling. I assume this is a mil app, but you can use fan cooling? What will GNU radio actually be doing? It's for an initial aerial demonstration of our keyless jam-resistant encoding. We are keeping it really, really simple. The airborne unit (the one using the Lippert board) will be toggling between running a C program that generates a waveform packet and then calling GnuRadio to broadcast that packet in the 2.4GHz ISM band using OOK. The packet will consist of nothing more than a timestamp and some additional junk data to fill out the message string. The ground station will sniff the spectrum and record and decode any packets it finds. If that goes well, then the bad guys will start jamming the spectrum and we want to see how much energy, relative to the UAV, they have to expend before they jam us - that they will jam us is not an open question, just how much energy it takes them to do so. The things you guys do at USAFA. I hope Red team has some smart guys and makes it competitive. If these are Sr. engineering students then it sounds like a really good learning experience. -Jeff ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] MRFM (Magnetic Resonance Force Microsocopy) and GNU Radio
The UW Quantum System Engineering Laboratory has written code for Magnetic Resonance Force Microscopy (MRFM). The code is available from http://staff.washington.edu/~jon/gr-mrfm/ Some of the code might be useful to other GNU Radio users. On the FPGA side, there is a 2-stage biquad filter with 24-bit (not 16-bit) data path and filter coefficients. There is also an input multiplexer and adder. On the host side, there is code (in Python with SciPy) that transforms transfer functions, expressed as ratios of polynomials with floating point coeffcients, into cascaded biquad stages with scaled integer coeffcients. The host side code acts as a server, so it can communicate with the MRFM experiment software over TCP/IP sockets. There is a sample client, also in Python with Scipy. I have put links to our site on the Wiki OurUsers and OtherCode pages. Jon Jacky ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Introducing myself to gnuradio ml
Hi all, A friend borrowed me his USRP w/ basic rx and tx, dbsrx and tvrx. I'm an undergraduate computer science student at Campinas University (Campinas, Brazil). I'm just starting to study RF, and my main target (I know it could take years to accomplish the task) is to receive Digital TV. Brasil uses the ISDB-T standart that uses COFDM modulation. The 6Mhz channel is divided into 13 segments - 12 segments for HDTV using 64QAM and 1 for 1seg using QPSK. The frequency band used is the VHF (7-13) and the UHF (14-63). Well, I realized that there are code in gnuradio for OFDM!! I wonder how can I get the TS from the air : ) Can anyone point me where to start? Thanks for the great project, Rafael Diniz ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Introducing myself to gnuradio ml
sorry about the noise, but I just found the official standard! http://www.abnt.org.br/imagens/Normalizacao_TV_Digital/ABNTNBR15601_2007Vc_2008.pdf in portuguese. :) Now I know that my knowledge to do something in the area is close to zero... thanks, rafael diniz Hi all, A friend borrowed me his USRP w/ basic rx and tx, dbsrx and tvrx. I'm an undergraduate computer science student at Campinas University (Campinas, Brazil). I'm just starting to study RF, and my main target (I know it could take years to accomplish the task) is to receive Digital TV. Brasil uses the ISDB-T standart that uses COFDM modulation. The 6Mhz channel is divided into 13 segments - 12 segments for HDTV using 64QAM and 1 for 1seg using QPSK. The frequency band used is the VHF (7-13) and the UHF (14-63). Well, I realized that there are code in gnuradio for OFDM!! I wonder how can I get the TS from the air : ) Can anyone point me where to start? Thanks for the great project, Rafael Diniz ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GnuRadio on PCI-104 (i.e., Fedora on USB Flash Drive)
Hi, Is it safe to use standard distributions (Fedora, Ubuntu,Mandriva,) in embedded applications ? What about sudden system power off without proper shutdown?.I think it may lead to OS damage. Is there a procedure (tips) to modify a standard Linux distribution to work in embedded systems? Regards, Firas -- View this message in context: http://www.nabble.com/GnuRadio-on-PCI-104-%28i.e.%2C-Fedora-on-USB-Flash-Drive%29-tp17010200p17031597.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
