Yes johnny for a while i need only OFDM transmitter and reciever via USRP
for my project. I just want that this OFDM system can transmit and receive
via USRP, that is my aim at the moment.
Thanks once again for your detailed clarification. i will try that and let
you know the results.
Thank
hello Johnny,
I tried that locate command and i have found the location of the files .here
is the output:
hp@ubuntu:~$ cd/usr/local/bin
bash: cd/usr/local/bin: No such file or directory
hp@ubuntu:~$ ls
DesktopDownloads Music Public Templates
Documents examples.desktop Pictures
Try this
cd /usr/share/gnuradio/examples/ofdm/
benchmark_ofdm_tx.py -h
Don't forget the spaces (just copy paste should work)
On Sun, Sep 11, 2011 at 7:19 PM, waqasme waqa...@hotmail.com wrote:
hello Johnny,
I tried that locate command and i have found the location of the files
.here
is
Quick correction
cd /usr/share/gnuradio/examples/ofdm/
./benchmark_ofdm_tx.py -h
On Sun, Sep 11, 2011 at 7:26 PM, Tuan (Johnny) Ta ta.tu...@gmail.comwrote:
Try this
cd /usr/share/gnuradio/examples/ofdm/
benchmark_ofdm_tx.py -h
Don't forget the spaces (just copy paste should work)
On
Thanks Johnny yah that worked ..it is showing me different options for
OFDM... so for this particular benchmark_ofdm file the signal processing
blocks are displaying in GNU Radio companion or is there anything else i
have to do to make the block diagram of the system? thank you so much for
your
http://pwnhome.files.wordpress.com/2011/04/simple_transceiver1.png
see carefully... it has a gmsk modulator in the bottom.u can make the
bottom modulator part in another pc
benchmark programs are quite good to start with...
u can type benchmark_ofdm.py -h to see all the parameters u can play
On Thu, Sep 8, 2011 at 6:47 PM, Guanbo Zheng gbzh...@gmail.com wrote:
Hi all
I am currently using OFDM benchmark to generate OFDM signal under the
setting of FFT len, CP length, occupied-tones and something.
But I can not find out what is the real bandwidth of signal it generated.
Because
On Fri, Sep 9, 2011 at 8:18 AM, Tom Rondeau trondeau1...@gmail.com wrote:
On Thu, Sep 8, 2011 at 6:47 PM, Guanbo Zheng gbzh...@gmail.com wrote:
Hi all
I am currently using OFDM benchmark to generate OFDM signal under the
setting of FFT len, CP length, occupied-tones and something.
But I
On Fri, Sep 9, 2011 at 6:36 PM, Guanbo Zheng gbzh...@gmail.com wrote:
On Fri, Sep 9, 2011 at 8:18 AM, Tom Rondeau trondeau1...@gmail.comwrote:
On Thu, Sep 8, 2011 at 6:47 PM, Guanbo Zheng gbzh...@gmail.com wrote:
Hi all
I am currently using OFDM benchmark to generate OFDM signal under
Great!! Thanks for your explanation!
Guanbo
On Fri, Sep 9, 2011 at 5:41 PM, Tom Rondeau trondeau1...@gmail.com wrote:
On Fri, Sep 9, 2011 at 6:36 PM, Guanbo Zheng gbzh...@gmail.com wrote:
On Fri, Sep 9, 2011 at 8:18 AM, Tom Rondeau trondeau1...@gmail.comwrote:
On Thu, Sep 8, 2011 at 6:47
As far as I know there's no open source code for an OFDM transceiver
available. I was trying to build one half a year back but wasn't successful
before I had to move on to something else. The benchmark_ofdm code will give
you a simplex OFDM system. Ie you can run the transmitter on 1 USRP and
On 09/09/2011 07:26 PM, Tuan (Johnny) Ta wrote:
As far as I know there's no open source code for an OFDM transceiver
available. I was trying to build one half a year back but wasn't
successful before I had to move on to something else. The
benchmark_ofdm code will give you a simplex OFDM
Thanks Marcus, that was very informative!
On Fri, Sep 9, 2011 at 8:00 PM, Marcus D. Leech mle...@ripnet.com wrote:
On 09/09/2011 07:26 PM, Tuan (Johnny) Ta wrote:
As far as I know there's no open source code for an OFDM transceiver
available. I was trying to build one half a year back but
Check out some of the publications by Fred Harris. He has written some good
stuff on sync. algorithms.
On Fri, Sep 9, 2011 at 5:48 PM, Tuan (Johnny) Ta ta.tu...@gmail.com wrote:
Thanks Marcus, that was very informative!
On Fri, Sep 9, 2011 at 8:00 PM, Marcus D. Leech mle...@ripnet.com wrote:
Hi Sumit,
Thank you so much for your quick response. yah i understand what your saying
and i am trying to understand this document but it doesnot help much . As
you mentioned use the same Tranceiver setup and only replace OFDM blocks
with that. My question is in this basic tranciver diagram the
And sorry to mention in the last mail that i will be suing USRP 1 .
waqasme wrote:
Hi Sumit,
Thank you so much for your quick response. yah i understand what your
saying and i am trying to understand this document but it doesnot help
much . As you mentioned use the same Tranceiver setup
Hi all
I am currently using OFDM benchmark to generate OFDM signal under the
setting of FFT len, CP length, occupied-tones and something.
But I can not find out what is the real bandwidth of signal it generated.
Because when I changed the Interpolation rate (sampling rate), the bandwidth
at RX
Hello sumit,
Thanks for your help i went through that document that you refered to, and i
tried to implement that OFDM transmitter part. This document only explain
about OFDM flow graph or transmitter. Is there any other document or
information related to OFDM modulator and demodulator
Try to understand these
http://pwnhome.wordpress.com/2011/04/26/intro-to-gnuradio-and-the-usrp-part-5-simple-transceiver/
here u need to put those ofdm blocks .. thats it also go through some
modifications as written in
refer to this..
http://pwnhome.wordpress.com/2011/01/29/intro-to-gnuradio-and-the-usrp-part-2-visualizing-the-waves/
waqasme wrote:
Hello All,
Does anyone know how to implement OFDM implementation by USING GNU RADIO
COMPANION. Some one told me to use Benchmark_OFDM.py script. But i am
Thanks for you help sumit. i really appriciate that . i will go through this
link and will let you know if i will have any further question or problem
regarding the OFDM implementation.
Thanks once again.
Regards,
Waqas.
sumitstop wrote:
refer to this..
Hi.
I wanted to know about the preambles that are inserted in the ofdm packet. I
know they are inserted for the synchronization and frequency offset
purposes.
But I want to know where in the OFDM packet they are inserted. I have
following questions.
1. How can I vary the length of preambles? Can
Dear GNU Radio list,
I've being diving into some GNU Radio examples in order to communicate
two USRP2s (e.g. USRP2 #1 pings USRP2 #2). Following the example
tunnel.py, in $GNURADIO_PATH/gnuradio-examples/python/digital, I've
been able to do it, but with a GMSK/DBPSK/DQPSK modulation scheme.
My
Hi Juan,
It isn't too hard to modify the OFDM tunnel script to use UHD instead
of the old USRP blocks.
You have to change the flow graph in tunnel.py to use new sink and
source blocks and update all of the sample rate and frequency setting
functions.
You can take a look at how I did it here:
I am going more deeply into the OFDM example, however I cannot figure out
which is the bit rate of the usrp.
I mean, I know and I can set the bit rate of my application but how fast the
packets are sent out by the usrp?
How can I evaluate the throughput on the wireless link?
Thanks
Vanessa
On 20/06/2011 10:05 AM, vanITA1082 wrote:
I am going more deeply into the OFDM example, however I cannot figure out
which is the bit rate of the usrp.
I mean, I know and I can set the bit rate of my application but how fast the
packets are sent out by the usrp?
How can I evaluate the throughput
Thank you!
I found 2 errors in benchmark_ofdm_tx.py:
line 63 should be sink
line 69 should be samp_rate
Thanks again
Vanessa
Nick Foster-4 wrote:
On Wed, 2011-06-01 at 00:50 -0700, vanITA1082 wrote:
Yes, but they do not work with UHD which is the only way to use my USRP
N210
I just
On Thu, Jun 9, 2011 at 1:24 AM, vanITA1082 vanessa.gardel...@iit.cnr.it wrote:
Thank you!
I found 2 errors in benchmark_ofdm_tx.py:
line 63 should be sink
line 69 should be samp_rate
Thanks again
Vanessa
Hi Vanessa,
One thing you might also have to change is the tx-amplitude in
On Thu, 2011-06-09 at 01:24 -0700, vanITA1082 wrote:
Thank you!
I found 2 errors in benchmark_ofdm_tx.py:
line 63 should be sink
line 69 should be samp_rate
Thanks. In addition, check out the messages Morgan Redfield just posted,
he found that the transmit_path multiplier should be
Hi Kunal,
I am planning to spend some more time on OFDM. Then, may be we can put all
the stuff in a README file, after Tom or somebody checks that for us :).
Usman
On Fri, Jun 3, 2011 at 9:23 PM, Kunal Kandekar kunalkande...@gmail.comwrote:
I think this email exchange contains good
I think this email exchange contains good documentation for (part of) the
OFDM example. Maybe we could put it in a README file, and upload it to the
OFDM directory? Or insert these as comments at the respective lines of code?
Kunal
On Thu, Jun 2, 2011 at 5:01 PM, Tom Rondeau
Hi all,
I am working on the OFDM in GnuRadio. After reading the code files and going
through the presentation on the OFDM implementation I did understand most
part of OFDM. But I still have few questions to ask:
1) how symbols_per_packet is calculated ? I know the following formula
On Thu, Jun 2, 2011 at 3:10 AM, Usman Haider usmanhaide...@gmail.comwrote:
Hi all,
I am working on the OFDM in GnuRadio. After reading the code files and
going through the presentation on the OFDM implementation I did understand
most part of OFDM. But I still have few questions to ask:
Hi Tom
Thanks a lot. Yes, that did help me :). One more question: what is the
purpose of probe at the end of OFDM chain?
alpha=0.001
thresh=30 #in dB
self.probe = gr.probe_avg_mag_sqrd_c(thresh,alpha)
self.connect(self.ofdm_rx, self.probe)
I do understand that probe computes the running average
Yes, but they do not work with UHD which is the only way to use my USRP N210
Marcus D. Leech wrote:
On 05/31/2011 10:15 AM, vanITA1082 wrote:
Thanks.
However we are trying to transmit a packet from a usrp n210 to another
usrp
n210 and we are searching for examples do to this simple
On Wed, 2011-06-01 at 00:50 -0700, vanITA1082 wrote:
Yes, but they do not work with UHD which is the only way to use my USRP N210
I just pushed a branch with UHD versions of the OFDM apps:
git://github.com/bistromath/gnuradio.git
It's in the uhd_ofdm branch. This is untested code, so use at
Thanks.
However we are trying to transmit a packet from a usrp n210 to another usrp
n210 and we are searching for examples do to this simple operation.
How is it possible that are not out there? Do you know any source of simple
examples?
Thanks
Vanessa
Tom Rondeau wrote:
On Mon, May 30,
On 05/31/2011 10:15 AM, vanITA1082 wrote:
Thanks.
However we are trying to transmit a packet from a usrp n210 to another usrp
n210 and we are searching for examples do to this simple operation.
How is it possible that are not out there? Do you know any source of simple
examples?
Thanks
Dear Tom,
Do you mind sharing your code for usrp n210 ?
I am new on gnuradio and usrp and I am not able to find a python example to
perform packet transmission.
Thank you
Vanessa
Tom Rondeau wrote:
On Mon, Jan 17, 2011 at 2:48 PM, Josh Blum j...@ettus.com wrote:
On 01/17/2011 11:31
On Mon, May 30, 2011 at 5:05 AM, vanITA1082 vanessa.gardel...@iit.cnr.itwrote:
Dear Tom,
Do you mind sharing your code for usrp n210 ?
I am new on gnuradio and usrp and I am not able to find a python example to
perform packet transmission.
Thank you
Vanessa
You can find lots of
Sankalp Nimbhorkar sankalp.nimbhorkar at gmail.com writes:
Hi all, Can anyone provide pointers from where I can download
OFDM implementation of softPHY for USRP2?Thanks and regardsSankalp NimbhorkarCSC
Graduate StudentNorth Carolina State University
http://people.csail.mit.edu/szym/rawofdm/
I found this a little bit a go. Never tried it though.
--Colby
On Wed, Apr 27, 2011 at 8:00 AM, Nemanja trecakov...@hotmail.com wrote:
Sankalp Nimbhorkar sankalp.nimbhorkar at gmail.com writes:
Hi all, Can anyone provide pointers from
Hello all
I am also trying to get OFDM mod and demod blocks already present in
gnuradio distribution to work.
The blocks work when used on the same computer. Once I try to receive on the
other USRP, the OFDM demodulator does not demodulate any signal.
Can anyone please let me know what problem
On 04/25/2011 09:15 PM, killol wrote:
Hello all
I am also trying to get OFDM mod and demod blocks already present in
gnuradio distribution to work.
The blocks work when used on the same computer. Once I try to receive on the
other USRP, the OFDM demodulator does not demodulate any signal.
Hi all,
Can anyone provide pointers from where I can download OFDM
implementation of softPHY for USRP2?
Thanks and regards
Sankalp Nimbhorkar
CSC Graduate Student
North Carolina State University
___
Discuss-gnuradio mailing list
Sounds great. I'll give it a shot and report the result later.
On Sun, Feb 27, 2011 at 4:30 PM, Tom Rondeau trondeau1...@gmail.com wrote:
On Wed, Feb 23, 2011 at 5:41 PM, Tuan (Johnny) Ta ta.tu...@gmail.comwrote:
A lot of people seem to have problem with the OFDM receiver in gnuradio.
Since
Hi,
I want to implement OFDM on gnu radio platform.
Is it possible to simulate the code provided without using the hardware .
Ben told me to use the Benchmark ofdm code. I wanted to know whether there
is some documentation for it or not.
Thanking you
Varun
On Wed, Feb 23, 2011 at 5:41 PM, Tuan (Johnny) Ta ta.tu...@gmail.comwrote:
A lot of people seem to have problem with the OFDM receiver in gnuradio.
Since there's no confirmation of a working *2-way* communication using
OFDM yet, I've decided to dig into the OFDM receiver implementation. I want
A lot of people seem to have problem with the OFDM receiver in gnuradio.
Since there's no confirmation of a working *2-way* communication using OFDM
yet, I've decided to dig into the OFDM receiver implementation. I want to
test the performance of the OFDM synchronization block. To do that, first I
Hi all,
I am trying to implement OFDM on USRP N210 using Gnu Radio.
I haven't got the entire hardware yet,so I was wondering whether it was
possible to edit the OFDM example provided , in order to bypass the hardware
requirements and just simulate the code and view its functioning.
I am
On Mon, Jan 17, 2011 at 7:58 PM, Guanbo gbzh...@gmail.com wrote:
Hi,
I feel like the output of coarse frequency offset is very inaccurate. Or
probably it is not directly related.
For best test, I tried higher resolution of subcarrier bandwidth by
selecting the large FFT length, high
Hi,
Thanks for the suggestions.
I use two USRP2s. When the receiver is loaded with the UHD driver it
exhibits poor performance. No matter if the sender is using the
standard or the UHD driver.
The buffer shouldn't be the problem:
Current recv sock buff size: 5000 bytes
I do get that
I use two USRP2s. When the receiver is loaded with the UHD driver it
exhibits poor performance. No matter if the sender is using the
standard or the UHD driver.
I was under the impression that performance meant high cpu load, too
many overflows/dropped packets. I think you mean that the app
Hi,
I updated the OFDM example. You can find it at
http://www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz
It supports both USRPs and the UHD driver. I get pretty bad
performance with UHD receiver for some reason. Any ideas?
Cheers,
Veljko
On Tue, Jan 11, 2011 at 9:26 PM, Guanbo
On 01/17/2011 11:31 AM, Veljko Pejovic wrote:
Hi,
I updated the OFDM example. You can find it at
http://www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz
It supports both USRPs and the UHD driver. I get pretty bad
performance with UHD receiver for some reason. Any ideas?
For the
On Mon, Jan 17, 2011 at 2:48 PM, Josh Blum j...@ettus.com wrote:
On 01/17/2011 11:31 AM, Veljko Pejovic wrote:
Hi,
I updated the OFDM example. You can find it at
http://www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz
It supports both USRPs and the UHD driver. I get pretty bad
Hi,
I feel like the output of coarse frequency offset is very inaccurate. Or
probably it is not directly related.
For best test, I tried higher resolution of subcarrier bandwidth by
selecting the large FFT length, high Interp/decim rate,
as follows:
@TX: $ sudo python
On Tue, Jan 4, 2011 at 6:49 AM, You Lizhao youlizhao2...@gmail.com wrote:
Hi all,
Recently I want to implement a OFDM based multi-rate system, and I am using
benchmark_ofdm_tx/benchmark_ofdm_rx programs in ofdm directory. I know I can
use unlock/lock mechnism to disconenct/connect the exising
On Tue, Jan 4, 2011 at 8:49 AM, You Lizhao youlizhao2...@gmail.com wrote:
Hi all,
Recently I want to implement a OFDM based multi-rate system, and I am using
benchmark_ofdm_tx/benchmark_ofdm_rx programs in ofdm directory. I know I can
use unlock/lock mechnism to disconenct/connect the exising
On Wed, Jan 12, 2011 at 7:36 PM, Guanbo gbzh...@gmail.com wrote:
Hi, Tom
I am not quite understand the ofdm_sync_xx.cc in python/gnuradio/blks2impl/.
What is the difference between frequency synchronization and carrier
frequency offset.
Why we have to do the timing and frequency
Thanks Tom. I tried to see how much the carrier frequency offset would be.
As you suggested above, I output the coarse freq offset bins, which was
similar as Srinivas's result. It is constant -2.
Does it means the carrier offset can be computed as: ADC rate /( Decim_rate
* FFT_len) * 2 ?
If
Hi, Tom
I am not quite understand the ofdm_sync_xx.cc in python/gnuradio/blks2impl/.
What is the difference between frequency synchronization and carrier
frequency offset.
Why we have to do the timing and frequency synchronization before it?
Thanks,
Guanbo
Tom Rondeau wrote:
On Tue, Feb
Hi, Tom
I am not quite understand the ofdm_sync_xx.cc in python/gnuradio/blks2impl/.
What is the difference between frequency synchronization and carrier
frequency offset.
Why we have to do the timing and frequency synchronization before it?
Also,
Thanks,
Guanbo
Tom Rondeau wrote:
On
On Mon, Jan 10, 2011 at 5:56 PM, mrah...@bu.edu wrote:
Hi all,
Does anyone know of any updated OFDM benchmark code that is modified to be
run on a USRP2? I have seen previous posts of this, however the link to the
updated code is no longer available.
Thanks,
Michael Rahaim
Graduate
Hi,
I was looking for the source codes through the list.
And I got one from Veljko from UCSB, who are very nice to share his codes,
ofdm_example.tar.gz
The codes are attached.
Given the enough gain in TX and RX, you can see the output result at RX.
Guanbo
Hi all,
Does anyone know of any updated OFDM benchmark code that is modified to
be run on a USRP2? I have seen previous posts of this, however the
link to the updated code is no longer available.
Thanks,
Michael Rahaim
Graduate Research Assistant
Smart Lighting Engineering Research Center
Hello,
I am trying to understand the design in benchmark OFDM code in Gnuradio.
In the code, OFDM_RECEIVER use OFDM_SYNC_PN to do the timing and frequency
offset synchronization, and then doing FFT_DEMOD to demodulate the signal.
After that, SLICER and DEMAPPER in GR_OFDM_FRAME_SINK are used to
Hi all,
Recently I want to implement a OFDM based multi-rate system, and I am using
benchmark_ofdm_tx/benchmark_ofdm_rx programs in ofdm directory. I know I can
use unlock/lock mechnism to disconenct/connect the exising blocks to change
modulation block, and it indeed works. However, I also
Hi,
I am trying to build the OFDM decoder on GRC based on the FTW 802.11a/g
encoder.
At the USRP2 receiver, after CFO compensation, I want to see the QPSK
constellation.
Basically, the process is:
bit stream ofdm mod usrp2 sink
usrp2 source -- timing offset comp --- CFO comp ofdm
Tom
After reading gr_ofdm_insert_preamble.cc it looks like the pilots are sent
periodically after every few payload symbols on all frequency bins. Is it
like what I have shown attached ? If yes, then how may payload symbols are
sent between two pilots ?
Another related question is: Who sets the
On Fri, Aug 27, 2010 at 12:19:53PM -0400, Srinivas wrote:
Another related question is: Who sets the parameters for the work function
in this block ? particularly noutput_samples.
Srinivas,
The parameters passed to work are determined by the GR runtime system.
Their values depend on a lot
On Fri, Aug 27, 2010 at 12:19 PM, Srinivas srini...@winlab.rutgers.edu wrote:
Tom
After reading gr_ofdm_insert_preamble.cc it looks like the pilots are sent
periodically after every few payload symbols on all frequency bins. Is it
like what I have shown attached ? If yes, then how may payload
On Tue, Aug 10, 2010 at 9:53 AM, Marcin Szelest
marcin.szel...@gmail.com wrote:
Hello,
I'm trying to add pilots to an OFDM modulation, is it possible with OFDM_mod
block?
How I can boost energy of pilot in OFDM signal?
Regards,
Marcin
http://szelest.org
Yes, this is possible. There is a
Hello,
I'm trying to add pilots to an OFDM modulation, is it possible with OFDM_mod
block?
How I can boost energy of pilot in OFDM signal?
Regards,
Marcin
http://szelest.org
___
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
To follow up with Chuck's question, I'm also having problem running tunnel
using OFDM. The individual transmissions between the 2 USRPs were fine
(albeit that I had to manually adjust the center frequency of 1 USRP (A) to
cope with the frequency offset). I had B operating at 2412MHz and A at
On 07/23/2010 09:38 AM, George Nychis wrote:
One last question still, do you know where I am missing a factor of two
here:
1) My calculation of the bandwidth of the 100 active bins, and the
actual bandwidth, is off by a factor of two:
(((100 MHz) / 32) / 1024) * 100 = 305.175781 kilohertz,
Hi all,
I am generating my own OFDM waveform which actually does not modulate
anything. Step by step.
I am simulating 1024 subcarriers but first generating 1024 zeros, and then I
want to only enable the center 100 subcarriers. To do this, I map the
center frequency at the first index in the
On 07/22/2010 11:51 PM, George Nychis wrote:
Hi all,
I am generating my own OFDM waveform which actually does not modulate
anything. Step by step.
I am simulating 1024 subcarriers but first generating 1024 zeros, and
then I want to only enable the center 100 subcarriers. To do this, I
map
Thanks a bunch for your response, Matt!
Since you are using an interpolation is a multiple of 4, you won't see CIC
rolloff, you get a nice flat passband.
Got ya!
There are likely a couple of issues causing the spectrum to look bad.
First, successive symbols coming out of the FFT will
Sorry for bringing up an old thread. I was having the same problem of not
receiving packets using benchmark_ofdm_* and changing the receiver frequency
to tune to the transmitter frequency indeed solved the problem.
However, if I have to manually do it every time, I don't see how I can get
ofdm
Hi,For past one week I have been trying to run tunnel.py in ofdm folder. I have
successfully run tunnel.py in digital folder as well as benchmark_ofdm_*.py
with 0 packet loss.I have tried different set of parameter settings but to no
avail. If any body has successfully ran the tunnel.py in
Hello I'm trying to send with benchmark_ofdm_tx and receive with
benchmark_ofdm_rx a OFDM modulation with next paremeters:
FFT lenght = 2048
Chanel occupied = 1512
Size of package = 1024
CP_adder = 128
and
FFT lenght = 4096
Chanel occupied = 3024
Size of package = 1024
CP_adder = 128
I'm
On Mon, Jun 21, 2010 at 9:05 AM, Chris_Spain christianper...@gmail.com wrote:
Hello I'm trying to send with benchmark_ofdm_tx and receive with
benchmark_ofdm_rx a OFDM modulation with next paremeters:
FFT lenght = 2048
Chanel occupied = 1512
Size of package = 1024
CP_adder = 128
and
could you try a smaller number of fft sub carriers (e.g., fft=128,
occupied=80, cp=32, i/d=32)? usually this works better than an ofdm with a
large number of carriers. this might be because the frequency offset of the
radio becomes comparable to the bin size when the number of sub carriers is
Hi Eric,
Thanks for the tip. I tried it out on a faster machine, and I observed
no such problems. The first machine that produces this problem has a
single core 2.8GHz CPU and the second one, which works fine, has a
dual core Intel Atom D510, both machines have 2GB of RAM each. I
should note that
On Fri, May 28, 2010 at 04:10:12PM -0700, Veljko Pejovic wrote:
Hi Eric,
Thanks for the tip. I tried it out on a faster machine, and I observed
no such problems. The first machine that produces this problem has a
single core 2.8GHz CPU and the second one, which works fine, has a
dual core
On Fri, May 21, 2010 at 02:15:15PM -0700, Veljko Pejovic wrote:
Hi,
I'm using two USRP2 with XCVR2450s, a week old gnuradio git master and
Ubuntu 9.10.
A few months ago while using the OFDM code I observed that I tend to
receive (or send?) packets in groups, although I was sending them
Hi,
I'm using two USRP2 with XCVR2450s, a week old gnuradio git master and
Ubuntu 9.10.
A few months ago while using the OFDM code I observed that I tend to
receive (or send?) packets in groups, although I was sending them
individually.
Now, I finally isolated the problem. I added a few simple
Hello,
I have a USRP1 with two RFX2400 cards and I'm trying to implement a OFDM
transceiver. So, having as reference the two examples benchmark_ofdm_tx and
benchmark_ofdm_rx, I made a new script. Both blocks are taking the same
parameters (freq, gain, fusb block size, fusb nblocks...). The
On 5/3/2010 1:48 AM, George Nychis wrote:
On Sun, May 2, 2010 at 4:08 AM, jf w jfwang...@gmail.com
mailto:jfwang...@gmail.com wrote:
Hi all,
I'm thinking about implementing non-contiguous OFDM with gnuradio.
So I read the ofdm codes of gnuradio. And I find the occupied
tones
George,
Since the code they built to do the NC-OFDM was based originally on the
code inside GNU Radio, doesn't it make sense to put that back into GNU Radio
instead of CGRAN? The way that I originally wrote the code was to allow for
people to do this by manipulating the subcarrier map, so as
On 05/03/2010 08:09 AM, Tom Rondeau wrote:
On 5/3/2010 1:48 AM, George Nychis wrote:
On Sun, May 2, 2010 at 4:08 AM, jf w jfwang...@gmail.com
mailto:jfwang...@gmail.com wrote:
Hi all,
I'm thinking about implementing non-contiguous OFDM with gnuradio.
So I read the ofdm codes of gnuradio. And
This might be relevant to the ofdm occupied tones concept
thread on this list.
I have uploaded some code on github that implements an OFDM tx/rx
with arbitrary modulation schemes per carrier.
The user specifies a list of constellations
(say, zeros, or pilots or QPSK or 16QAM) and then the index
Hi all,
I'm thinking about implementing non-contiguous OFDM with gnuradio. So I read
the ofdm codes of gnuradio. And I find the occupied tones concept in
gnuradio. Is it designed for non-contiguous OFDM? Or it is for other
reasons?
--
Thanks,
Jianfei
BUAA
On Sun, May 2, 2010 at 4:08 AM, jf w jfwang...@gmail.com wrote:
Hi all,
I'm thinking about implementing non-contiguous OFDM with gnuradio. So I
read the ofdm codes of gnuradio. And I find the occupied tones concept in
gnuradio. Is it designed for non-contiguous OFDM? Or it is for other
On 2/20/2010 7:43 PM, Srinivas wrote:
Hi Tom,
I tried increasing the bandwidth of the filter and also tried changing
the window type to KAISER, but it didn't improve on the offset error.
I am getting a constant frequency offset value -10. Currently, I am
just compensating for the offset at
Iam trying the OFDM modulation and loopback in grc and not able to see
modulated output and message signal in oscilloscope sink.grc codes are
attached for both.
can any one help me in buiding ofdm(mod, demod, loopback , ofdm transmit
to USRP sink and ofdm rx through another USRP source ) in grc
--
Hi Tom,
I tried increasing the bandwidth of the filter and also tried changing the
window type to KAISER, but it didn't improve on the offset error. I am
getting a constant frequency offset value -10. Currently, I am just
compensating for the offset at the receiver or specifying a minimum BW to
On Thu, Feb 18, 2010 at 12:49 AM, Srinivas psriniva...@gmail.com wrote:
Hi Tom, Matt
replied inline:
On Wed, Feb 17, 2010 at 10:26 AM, Tom Rondeau trondeau1...@gmail.com
wrote:
On Tue, Feb 16, 2010 at 5:45 PM, Srinivas psriniva...@gmail.com wrote:
Matt,
Thanks for verifying the data
On Tue, Feb 16, 2010 at 5:45 PM, Srinivas psriniva...@gmail.com wrote:
Matt,
Thanks for verifying the data rate calculation!
I tried the other solutions that you suggested, namely,
- increasing the data rate by a factor of 2 or 4
It works.
- modifying the OFDM code to widen the search
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