[Discuss-gnuradio] Failed to set RF frequency
Hey all, I am still checking out whether my USRP is working correctly in both transmit and receive modes or not. The problem is sometimes when i run the transmitter or receiver codes, the USRP fails to set the RF frequency of my transceivers, and at other times it works. I don't know what is causing this error. Could somebody suggest me a solution? -Tks Bruhtesfa ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GNU-Radio API
I'm starting with GNU-Radio in order to do my final thesis and I've been working with some of the examples of the lastest version. I have some problems finding information about certain classes that doesn't appear in Doxygen GNU-Radio API. Do you know a newer API??? What example do yo think is going to be better for a newbie in order to try to connect two computers through USRP?? Thanx in advance Ptr ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Eric's schedule
FYI, I'll be off-list and mostly out of communication for the next 4 weeks. If any administrative issues come up while I'm gone, please contact Johnathan Corgan [EMAIL PROTECTED]. Have fun! Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] firmware update of usrp2, wiki- update?
Hi list, I finally got my hands on an sd-card reader/writer, and as I have been trying to get a hold of one for some time I was eager to update my firmware I jumped straight at the FAQ. Where I was discouraged by the fact that I have no idea about what device I'm using. Anyway, an answer is almost always a google away, so I found this link http://vic.gedris.org/linux-UsbMassStorage/ which tells you to do the following steps to determine which device you would like to flash. 1. Install sg3-utils package $sudo apt-get update $sudo apt-get install sg3-utils 2. List the raw scsi- devices on your system $sg_scan -i 3. Have a look at the list printed out, and determine which SCSI- device is most likely your USB- card reader/writer. 4. Run sg_map to see what SCSI- device is associated with the USB sdcard r/w- device. $sg_map Thought this might be something for the wiki- page... Instead of having just a warning, there could be a warning and a solution =;o]. But since I Cheers! Mattias Kjellsson ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter
On Tue, 2008-11-11 at 08:26 +0100, Vincenzo Pellegrini wrote: Martin , sorry for the delay. My exams seem to have gone well even if it's not official yet. Great I also had to do a demo for a company I have a temporary contract with for developing some gnuradio based gsm-r security sentinels. Also the demo was smooth. (i already listed the project on the gnuradio wiki) Good work. so i really hope i'll be able to prepare the 8Mhz stream for you within the next 2/3 days. Would this still be useful? Yes it really would. I am also really looking forward for the sources. One of the things I am planning to do is use the structure of your code as a basis for a DVB-T receiver. It is always easier debugging a receiver when you can make a full loop. (transmitter and receiver back-to-back) Greetings, Martin 2008/11/3, Martin DvH [EMAIL PROTECTED]: On Mon, 2008-11-03 at 14:13 +0100, Martin DvH wrote: Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Vincenzo Pellegrini Verzonden: maandag 3 november 2008 0:16 Aan: Martin DvH CC: discuss-gnuradio Onderwerp: [Discuss-gnuradio] Re: Soft-DVB DVB-T transmitter This is Great... :) Yup, the playback cannot be smooth because of the wrong throughput, definitely. Did you use the USRP1 with interpolation factor = 16 ? Yes I did. I can prepare a modulated signal with the correct throughput for you.. this is not a problem... :) Please do, this would be great. what hard disc are you playing your signal back from? Internal 2.5 harddisk of my acer 6930 notebook (Aspire 6930G-734G32BN LX.AVB0X.135) 2.5 320GB HDD 5400rpm, SATA I checked now. It is a: Western digital Scorpio 320 GB SATA (WDC WD3200BEVT-22ZCT0) 2.5-inch SATA Hard Drive 320 GB, 3 Gb/s, 8 MB Cache, 5400 RPM Benchmark from tomshardware (h2benchw 3.6): http://www.tomshardware.com/charts/2-5-hard-drive-charts/Minimum-Read-Transfer-Performance,687.html minimum read transfer rate 33.5 MB/sec average read transfer rate 52.2 MB/sec maximum read transfer rate 68.2 MB/sec I am not at home right now So I can't check the exact brand and model of the harddisk. It can do around 38 MB/sec so this is just enough (required 32 MB/sec) I also have 4GB of memory in this notebook, so I think it will buffer the complete file. I had to use my notebook because with my desktop PC (ASrock 939-DUAL-SATA2) The USB TX bandwidth is less then 32 MB/sec. (Which is strange because I CAN receive 32 MB/sec) I get UuUuUu on this machine when useing interpolation 16, so unusable. Regards, Martin regards vincenzo 2008/11/3 Martin DvH [EMAIL PROTECTED] Hi, In fact: 8 complex Msps implement a 7 MHz channel while 9.142857143 complex Msps implement an 8 MHz channel. Just try to go as close as possible to such sampling frequency by using USRP2 and let me know what happens... it could turn out that we need a resampler block. So if I use a fractional rate resampler with interpolation factor 10/8=1.25 I get a 7 Mhz channel with 10 Msps samplerate. If I use a fractional rate resampler with interpolation factor 10/9.142857143=1.09375 I get a 8 Mhz channel with 10 Msps samplerate If I use a fractional rate resampler with DECIMATION factor 9.142857143/8=8/7=1.142857143 I get a 8 Mhz channel with 8 Msps samplerate with the out-of-band skirts folded back at the sides. Would be interesting to see if this last one works with a USRP1. I'll let you know how the experiments go. I resampled and scaled your ofdm_40.dump file so it now will use 8 Mhz bandwidth with a 8 Msps samplerate. The reception never can be perfect this way but it seems good enough for tests. My USB DVB-T receiver receives the transport stream without problems. Mplayer playes the stream without problem for two loops and then crashes with a broken frame. My standalone settopbox DVB-T receiver now also receives the stream. (8 MHz channel on UHF) It has big problems displaying it. Sound is only a chop of sound now and then and video stops, then runs for a second, then stops again. I think this is because the timestamps and framerate (playout speed) don't match the data throughput of the MPEG stream anymore. (It is getting the stream too fast) I put my resampled RF file at:
[Discuss-gnuradio] Jack 1.9 official release
Future Jack2 will be based on C++ jackdmp code base. Jack 1.90 is the renaming of jackdmp and the result of a lot of developments started after LAC 2008. What is new: - waf based build system : Nedko Arnaudov, Grame for preliminary OSX support - control API, dbus based server control access : Nedko Arnaudov, Grame - NetJack2 components (in progress) : jack_net backend, netmanager, audioadapter, netadapter : Romain Moret, Grame - code restructuring to help port on other architectures : Michael Voigt - code cleanup/optimization : Tim Blechmann - improve handling of server internal clients that can now be loaded/ unloaded using the new server control API : Grame - a lot of bug fix and improvements Jack 1.90 (API compatible with Jack 0.109.2) is now distributed in 2 different versions: Source code only: http://www.grame.fr/~letz/jack-1.9.0.tar.bz2 http://www.grame.fr/%7Eletz/jack-1.9.0.tar.bz2 Source code with OSX 32/64bits and Windows binaries: http://www.grame.fr/~letz/jack-1.9.0.tgz http://www.grame.fr/%7Eletz/jack-1.9.0.tgz Stéphane ARRL SDR Working Group Chair Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. Don't despair, not even over the fact that you don't despair. , Kafka ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Can't transmit from USRP2
Today I updated gnuradio to current svn9988. And while doing that I also downloaded the binary package of mb-gcc and built the firmware- files, successfully thanks to the wiki and a well known search- engine. The new firmware was loaded onto the sd- card successfully(?) is there supposed to be some output from u2_flash_tool, I can't locate the source for it, so I can't check for myself. But since I could run find_usrps with the (probably) new firmware, I guess it went fine. I then tried all the test- programs, and they ran fine (find_usrps, tx_sample, ... from usrp2/host/apps/), before lunch, but when I got back from lunch they didn't. I simply can't transmit according to my hardware oscilloscope. Although I see packages flowing on my eth0- device (using wireshark). And when I try rx_streaming_samples (with a signal- generator as source, generating a 100kHz sine) I suddenly receive a lot of noise. Looking at the fft of the received signal one could say that it _might_ be a sinusoid in there, but very weak. But only after lunch, before lunch the received signal was a noise free sinus of 100kHz... The only thing that is working as expected after I got back is find_usrps. I think I'll never eat lunch again ;) I'm out of ideas of how to solve this. Suggestions of things to try and/or check for, no matter how simple would be appreciated. BR //Mattias Kjellsson ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] When will the WBX be available?
Hello Matt, I didn't see the WBX0510 board on the Orde Page of your website. Is it avalable for order now? BR, Hanwen ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Can't transmit from USRP2, version2.
Today I updated gnuradio to current svn9988. And while doing that I also downloaded the binary package of mb-gcc and built the firmware- files, successfully thanks to the wiki and a well known search- engine. The new firmware was loaded onto the sd- card successfully(?) is there supposed to be some output from u2_flash_tool, I can't locate the source for it, so I can't check for myself. But since I could run find_usrps with the (probably) new firmware, I guess it went fine. I then tried all the test- programs, and they ran fine (find_usrps, tx_sample, ... from usrp2/host/apps/), before lunch, but when I got back from lunch they didn't. I simply can't transmit according to my hardware oscilloscope. Although I see packages flowing on my eth0- device (using wireshark). And when I try rx_streaming_samples (with a signal- generator as source, generating a 100kHz sine) I suddenly receive a lot of noise. Looking at the fft of the received signal one could say that it _might_ be a sinusoid in there, but very weak. But only after lunch, before lunch the received signal was a noise free sinus of 100kHz... The only thing that is working as expected after I got back is find_usrps. Althoug, I need to run it twice to make it find my usrp2... I think I'll never eat lunch again ;) I'm out of ideas of how to solve this. Suggestions of things to try and/or check for, no matter how simple would be appreciated. BR //Mattias Kjellsson ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Failed to set RF frequency
On Fri, 2008-11-14 at 10:27 +0100, Bruhtesfa Ebrahim wrote: I am still checking out whether my USRP is working correctly in both transmit and receive modes or not. The problem is sometimes when i run the transmitter or receiver codes, the USRP fails to set the RF frequency of my transceivers, and at other times it works. I don't know what is causing this error. Could somebody suggest me a solution? -Tks You'll need to be a lot more specific about your problem for anyone to be able to help you. -Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Running usrp2_wfm_rcv.py
Hello, I attached the results of svn info for: gnuradio usrp2_wfm_rcv.py usrp2_fft.py The reversions are below. gnuradio Repository Root: http://gnuradio.org/svn Repository UUID: 221aa14e-8319-0410-a670-987f0aec2ac5 Revision: 9900 Node Kind: directory Schedule: normal Last Changed Author: jcorgan Last Changed Rev: 9863 Last Changed Date: 2008-10-26 23:09:27 -0400 (Sun, 26 Oct 2008) usrp2_wfm_rcv.py [EMAIL PROTECTED]:/home/gnuradio/gnuradio# svn info Path: . URL: http://gnuradio.org/svn/gnuradio/trunk Repository Root: http://gnuradio.org/svn Repository UUID: 221aa14e-8319-0410-a670-987f0aec2ac5 Revision: 9900 Node Kind: directory Schedule: normal Last Changed Author: eb Last Changed Rev: 9878 Last Changed Date: 2008-10-27 12:36:52 -0400 (Mon, 27 Oct 2008) usrp2_fft.py [EMAIL PROTECTED]:/home/gnuradio/gnuradio/gr-utils/src/python# svn info Path: . URL: http://gnuradio.org/svn/gnuradio/trunk/gr-utils/src/python Repository Root: http://gnuradio.org/svn Repository UUID: 221aa14e-8319-0410-a670-987f0aec2ac5 Revision: 9900 Node Kind: directory Schedule: normal Last Changed Author: jcorgan Last Changed Rev: 9864 Last Changed Date: 2008-10-26 23:32:36 -0400 (Sun, 26 Oct 2008) Please let me know how I can solve this problem. Thank you, Catalin Johnathan Corgan wrote: On Thu, Nov 13, 2008 at 5:48 AM, Catalin LACATUS [EMAIL PROTECTED] wrote: -I tried to run usrp2_wfm_rcv.py to test my USRP2 with a BasicRX board and I got the following error. ¨AttributeError: 'usrp2_source_32fc_sptr' object has no attribute 'adc_rate'¨ Could you please confirm which repository revision of software you are using? Change into the top level directory that you checked out the source code into, and type: $ svn info On the surface, this looks like a version mismatch between the usrp2_fft.py script and the rest of GNU Radio. It could be other things as well, however. -Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GNU-Radio API
On Fri, Nov 14, 2008 at 1:50 AM, Pedro Sánchez Canal [EMAIL PROTECTED] wrote: I'm starting with GNU-Radio in order to do my final thesis and I've been working with some of the examples of the lastest version. I have some problems finding information about certain classes that doesn't appear in Doxygen GNU-Radio API. Do you know a newer API??? What example do yo think is going to be better for a newbie in order to try to connect two computers through USRP?? You can create fresh docs on your own system by adding --enable-doxygen --enable-html-docs to the configure command during compile. Not sure what you mean by connect two computers. You can do TCP/IP networking between two computers with the tunnel.py application in the examples/python/digital directory. For a simple one way demonstration of BPSK with bit error rate testing, you can try the scripts in examples/python/digital-bert -Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] firmware update of usrp2, wiki- update?
On Fri, Nov 14, 2008 at 2:00 AM, Mattias Kjellsson [EMAIL PROTECTED] wrote: Thought this might be something for the wiki- page... Instead of having just a warning, there could be a warning and a solution =;o]. But since I Go ahead and update it, that's what wikis are for. login: guest password: gnuradio -Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Can't transmit from USRP2
On Fri, Nov 14, 2008 at 7:14 AM, Mattias Kjellsson [EMAIL PROTECTED] wrote: Today I updated gnuradio to current svn9988. And while doing that I also downloaded the binary package of mb-gcc and built the firmware- files, successfully thanks to the wiki and a well known search- engine. You will also need to either build or download the FPGA firmware. The new firmware was loaded onto the sd- card successfully(?) is there supposed to be some output from u2_flash_tool, I can't locate the source for it, so I can't check for myself. There is no output upon success. You can re-run the same command, but use -v instead of -w to verify the SD card contents match the file you copied into it. -Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Running usrp2_wfm_rcv.py
On Fri, Nov 14, 2008 at 7:53 AM, Catalin Lacatus [EMAIL PROTECTED] wrote: I attached the results of svn info for: Thanks. While it looks like your repository is in order, the version of the Python script you are running doesn't appear to match the version of the USRP2 library that is actually installed on the system. Other people who have recently reported similar issues as you have solved it by doing a fresh rebuild and reinstallation of the code. You can do this either by checking out a fresh version of the trunk, or, by running 'make distclean', then repeating the usual steps for configuration and installation. -Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Problems with the usrp_rx_cfile.py, usrp_fft.py and usrp_oscope.py and RFID signals
Hello, I am a student and I am doing my thesis project on the RFID protocols. At the present time, with the USRP, I am trying to catch the signal between a reader and a tag RFID. As reader I am using an OpendPCD (using the firmware for the Mifare Classic protocol) and as card a Mifare Classic Card. Because of I am a very beginner of USRP and all the rest, I am using the programs usrp_fft.py and usrp_oscope.py and the usrp_rx_cfile.py program with another program called Baudline to analyse the spectrum. My problem is that I can easily see in the frequency domain, using usrp_fft, the carrier at 13.561Mhz, but not the subcarrier that should be a 847KHz modulation of the carrier (probably covered by noise) even if I try to use a baseRX daughterboard instead of the LFRX. Moreover, in the time domain (with the usrp_oscope), I cannot recognize anything interesting. As it isn't enough, with the usrp_rx_cfile and the program baudline I cannot recognize neither the carrier: my opinion is that it is caused by a wrongly interpretation of the bit-length of the samples (and for this I should need a confirmation that the output samples are 16 bit-length). That program supports these formats: alaw ulaw s8 u8 le16 be16 le32f be32f. Does anybody know wich is the format I should use? Probably I'm using wrongly the hardware and the software I have... Could somebody suggest me a solution? Any kind of help will be absolutely well appreciated! thank you, Marco ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Failed make check on gr_top_block_sptr_connect
I am attempting to install GNU radio on Ubuntu 8.10, 2.6.27-7 kernel on an i686 computer. I get the following error (4 times). How do I get around this, and will it still run properly? == ERROR: test_loopback_003 (__main__.qa_atsc) -- Traceback (most recent call last): File ./qa_atsc.py, line 209, in test_loopback_003 self.tb.connect(src, rand, rs_enc, inter, trellis, softds, viterbi, deinter, rs_dec, derand, dst) File /home/mcpetzold/gnuradio/gnuradio-core/src/python/gnuradio/gr/top_block.py, line 99, in connect self._connect(points[i-1], points[i]) File /home/mcpetzold/gnuradio/gnuradio-core/src/python/gnuradio/gr/top_block.py, line 105, in _connect dst_block.basic_block(), dst_port) File /home/mcpetzold/gnuradio/gnuradio-core/src/lib/swig/gnuradio_swig_py_runtime.py, line 1469, in connect return _gnuradio_swig_py_runtime.gr_top_block_sptr_connect(*args) NotImplementedError: Wrong number of arguments for overloaded function 'gr_top_block_sptr_connect'. Possible C/C++ prototypes are: connect(boost::shared_ptr gr_top_block *,gr_basic_block_sptr) connect(boost::shared_ptr gr_top_block *,gr_basic_block_sptr,int,gr_basic_block_sptr,int) -- Ran 4 tests in 1.761s FAILED (errors=4) FAIL: run_tests === 1 of 1 tests failed === make[4]: *** [check-TESTS] Error 1 make[4]: Leaving directory `/home/mcpetzold/gnuradio/gr-atsc/src/python' make[3]: *** [check-am] Error 2 make[3]: Leaving directory `/home/mcpetzold/gnuradio/gr-atsc/src/python' make[2]: *** [check-recursive] Error 1 make[2]: Leaving directory `/home/mcpetzold/gnuradio/gr-atsc/src' make[1]: *** [check-recursive] Error 1 make[1]: Leaving directory `/home/mcpetzold/gnuradio/gr-atsc' make: *** [check-recursive] Error 1 Thanks, Mark C. Petzold, Ph.D. Associate Professor Department of Electrical and Computer Engineering, ECC 211 St. Cloud State University 720 Fourth Ave. South St. Cloud, MN 56301 (320) 308-4182 [EMAIL PROTECTED] ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Failed make check on gr_top_block_sptr_connect
On Fri, 2008-11-14 at 12:19 -0600, Petzold, Mark C. wrote: I am attempting to install GNU radio on Ubuntu 8.10, 2.6.27-7 kernel on an i686 computer. I get the following error (4 times). Which version of the software are you trying to install? How do I get around this, and will it still run properly? Recompile, but add --disable-gr-atsc to the configure command. -Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] When will the WBX be available?
hanwen wrote: Hello Matt, I didn't see the WBX0510 board on the Orde Page of your website. Is it avalable for order now? The WBX0510 has been delayed due to a problem with IQ balance and because of the need to get the USRP2 out the door. I promise that when it is ready, it will be added to the ordering page of the website. I promise that when it is ready, there will be an announcement. Thus, if it is not on the order page and it is has not been announced, you can safely assume that it is not ready. Nobody wants it to be ready more than me, but I won't ship it before it is 100%. Thanks, Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] RSSI value in inband code
Hi
after looking at the verilog code for some time, these are my results:
in module usrp_inband_usb, for each of the four aux adcs, the signal level is
read from the adc and an gliding average of the rssi and an saturation
indicator is is calculated. The rssi value is put but into the lower 16 bits
of an 32 bit bus, which is passed on through the module rx_buffer_inband and
reaches the module packet_builder.
In packet_builder, the rssi bus of the adc corresponding with the channel
which is transmitted is selected. Until here, everything is fine.
As said before, the rssi value is in the 16 lower bits of the rssi bus. When
looking at the calculation of the rssi value, it is apparent that it is a IIR
filter with output value in the range [0..0x7ff] (max value is determined by
the max absolute value of the aux adc, which is 0x7ff).
Now, the packet_builder takes the lower 6 bits of the 16 bit register with an
value range corresponding to 11 bits and puts it into the usb packet. So as
soon as the average value of the adc is higher than 0x3f (63), the rssi value
in the usb packet will be just noise.
Proposal:
Change the rssi value to a logarithmic encoding. With a 3.3 split, 10 bits can
be encoded, which is almost the range of the aux adc (11bit). Step size is
about 0.1dB.
A verilog module for encoding the rssi value is attached. I have no tools for
verilog, so I did not test it. Dont know if it works, and if the the changes
in the packet_builder for getting the log value from the linear value is
correct.
Would be nice if anyone could test this and pass an fpga firmware on to me.
Thanks,
Stefan
--
Stefan Brüns / Bergstraße 21 / 52062 Aachen
mailto:lurch at gmx.li http://www.kawo1.rwth-aachen.de/~lurchi/
phone: +49 241 53809034 mobile: +49 151 50412019
module rssi_lin_law (
input [9:0] lin,
output [5:0] law );
always @(lin)
case(lin)
10'b1x : law = {3b'111,lin[8:6]};
10'b01 : law = {3b'110,lin[7:5]};
10'b001xxx : law = {3b'101,lin[6:4]};
10'b0001xx : law = {3b'100,lin[5:3]};
10'b1x : law = {3b'011,lin[4:2]};
10'b01 : law = {3b'010,lin[3:1]};
10'b001xxx : law = {3b'001,lin[2:0]};
// 10'b000xxx : law = {3b'000,lin[2:0]};
default : law = {3b'000,lin[2:0]};
endcase
endmodule
--- packet_builder.v_orig 2008-11-14 17:18:11.0 +0100
+++ packet_builder.v 2008-11-14 17:39:28.0 +0100
@@ -47,6 +47,7 @@
reg [3:0] check_next;
wire [31:0] true_rssi;
+wire [5:0] true_rssi_law;
wire [4:0] true_channel;
wire ready_to_send;
@@ -109,8 +110,10 @@
end
`HEADER2: begin
+rssi_lin_law (
+ .lin(true_rssi[10:1]), .law(true_rssi_law );
fifodata[`CHAN] = #1 true_channel;
-fifodata[`RSSI] = #1 true_rssi[5:0];
+fifodata[`RSSI] = #1 true_rssi_law;
fifodata[`BURST] = #1 0;
fifodata[`DROPPED] = #1 0;
fifodata[`UNDERRUN] = #1 (check_next == 0) ? 1'b0 : underrun[true_channel];
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RE: [Discuss-gnuradio] Problems with the usrp_rx_cfile.py, usrp_fft.py and usrp_oscope.py and RFID signals
I am a student and I am doing my thesis project on the RFID protocols. At the present time, with the USRP, I am trying to catch the signal between a reader and a tag RFID. As reader I am using an OpendPCD (using the firmware for the Mifare Classic protocol) and as card a Mifare Classic Card. Because of I am a very beginner of USRP and all the rest, I am using the programs usrp_fft.py and usrp_oscope.py and the usrp_rx_cfile.py program with another program called Baudline to analyse the spectrum. My problem is that I can easily see in the frequency domain, using usrp_fft, the carrier at 13.561Mhz, but not the subcarrier that should be a 847KHz modulation of the carrier (probably covered by noise) even if I try to use a baseRX daughterboard instead of the LFRX. Moreover, in the time domain (with the usrp_oscope), I cannot recognize anything interesting. As it isn't enough, with the usrp_rx_cfile and the program baudline I cannot recognize neither the carrier: my opinion is that it is caused by a wrongly interpretation of the bit-length of the samples (and for this I should need a confirmation that the output samples are 16 bit-length). That program supports these formats: alaw ulaw s8 u8 le16 be16 le32f be32f. Does anybody know wich is the format I should use? Probably I'm using wrongly the hardware and the software I have... Could somebody suggest me a solution? Any kind of help will be absolutely well appreciated! thank you, Marco RFID modulation can be either AM or FM. For AM, modulation depth can be anywhere between 10% and 100%. If your system is AM and your receiver is overdriven, you will not see anything like 10% modulation depth. Try increasing the distance between transmitter (RFID reader) and receiver antenna, thus weakening the signal, and see if the modulation sidebands appear. Using usrp_oscope.py, you should be able to clearly see the modulation notches if you have an AM system, although it can be difficult to trigger properly. Note that the RFID transmissions have a low duty factor, so that the modulation content represents a small portion of the total energy. So, analyzing the RFID transmissions sometimes means you must first find a way to synchronize your fft sampling to the packet bursts. Paul Mathews ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GnuRadio and CUDA
I've just been given a Nvidia Quadro 5600 and I am thinking of using it for DSP. Has anyone experimented with USRP gnuradio cuda? ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Question about USRP2
Hi, I am quite new to the GNU radio. We just got the USRP2. I am wondering if the steps in the GettingStart in http://gnuradio.org/trac/wiki/GettingStarted; are applicable to USRP2, or they are for USRP only. Thanks. Regards, Yabo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Question about USRP2
On Fri, Nov 14, 2008 at 8:56 PM, Yabo Li [EMAIL PROTECTED] wrote: Hi, I am quite new to the GNU radio. We just got the USRP2. I am wondering if the steps in the GettingStart in http://gnuradio.org/trac/wiki/GettingStarted; are applicable to USRP2, or they are for USRP only. Thanks. Yes. As a note, the code for the USRP2 is still being developed feverishly so make sure to stay up to date. Brian ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] how to change the channel width when data is transmitting
Hi, Matt Ettus wrote : I checked in a fix to the verilog to allow this. However, the released rbf files haven't been updated yet, so you will need to compile it yourself. Matt I compiled your changes today. The rbf is given on the link below. I will try to test it and give you a report. http://rapidshare.com/files/163918423/std_2rxhb_2tx.rbf Best Regards, Firas -- View this message in context: http://www.nabble.com/how-to-change-the-channel-width-when-data-is-transmitting-tp20471587p20512914.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
