It could be related to the limitations of the ARM processor on the E100. I
haven't tried the OFDM examples. The workarounds at this point seem to be: help
implement some of the ARM NEON optimizations in Volk to squeeze out more
performance or switch back to an USRP running on a system capable of
>
> Hello Marcus thanks for your reply.. Well the problem is there is not much
> documentation available on internet on usurp .. Also I am quite new to gnu
> radio and usrp1 ... I tried to play with interpolation and decimation
> settings but didnot get the desired ofdm signal .. I am not sure what
Hello Marcus thanks for your reply.. Well the problem is there is not much
documentation available on internet on usurp .. Also I am quite new to gnu
radio and usrp1 ... I tried to play with interpolation and decimation
settings but didnot get the desired ofdm signal .. I am not sure what else I
c
Hello Marcus thanks for your reply.. Well the problem is there is not much
documentation available on internet on usurp .. Also I am quite new to gnu
radio and usrp1 ... I tried to play with interpolation and decimation
settings but didnot get the desired ofdm signal .. I am not sure what else I
c
Hello Marcus thanks for your reply.. Well the problem is there is not much
documentation available on internet on usurp .. Also I am quite new to gnu
radio and usrp1 ... I tried to play with interpolation and decimation
settings but didnot get the desired ofdm signal .. I am not sure what else I
c
On Oct 18, 2011, at 11:18 AM, "Marcus D. Leech" wrote:
>>
>> hi Marcus,
>>
>> I am attaching the screen shots and also block diagram of transmitter..
>> right now i am just trying to look for transmission of OFDM signal via
>> usrp1. As i mentioned earlier in the fft scope plot in gnu radio i s
>
> hi Marcus,
>
> I am attaching the screen shots and also block diagram of transmitter..
> right now i am just trying to look for transmission of OFDM signal via
> usrp1. As i mentioned earlier in the fft scope plot in gnu radio i see the
> typical ofdm signal but on the other hand in usrp sink o
hi Marcus,
I am attaching the screen shots and also block diagram of transmitter..
right now i am just trying to look for transmission of OFDM signal via
usrp1. As i mentioned earlier in the fft scope plot in gnu radio i see the
typical ofdm signal but on the other hand in usrp sink on the spectr
On 10/16/2011 05:55 PM, waqasme wrote:
Hi Marcus,
As i mentioned the flow graph signal blocks i have used in gnu radio
companion from that i am getting this out put on FFT sink in GNU radio
companion simulation flowgraph which is similar like this
If you're trying to embed images, it's not w
Hi Marcus,
As i mentioned the flow graph signal blocks i have used in gnu radio
companion from that i am getting this out put on FFT sink in GNU radio
companion simulation flowgraph which is similar like this
and i have used RF cable to connect from USRP1 TX board to the spectrum
analyser
On 10/16/2011 12:29 PM, waqasme wrote:
Hello all,
I am trying to transmitt and recieve OFDM signal Via USRP1 board. I made
basic simulation in GNU radio a signal source block and then interleave and
then OFDM modulator and then channel model block then usrp1 sink and fft
sink to see the output..I
Hello all,
I am trying to transmitt and recieve OFDM signal Via USRP1 board. I made
basic simulation in GNU radio a signal source block and then interleave and
then OFDM modulator and then channel model block then usrp1 sink and fft
sink to see the output..In FFT sink at the end it shows proper sq
I am trying to run the open source ofdm code , with USRP 2 as receiver and
USRP N210 as transmitter at the center frequency 2.49G with RF board XCVR
2450 , transmitter is sending the data , but when I run usrp2_fft.py on
receiver i get http://old.nabble.com/file/p32662141/Screenshot-4.png
but w
Hi everyone,
I am trying to test signal tranmit by using OFDM modulator via USRP1 and i
am getting this error message . Does anyone know what does it mean?or how to
fix this problem. i connected one usrp1 with usb cable to my laptop just to
check the transmission. it shows the signal in FFT sink
Hi everyone,
I am trying to test signal tranmit by using OFDM modulator via USRP1 and i
am getting this error message . Does anyone know what does it mean?or how to
fix this problem. i connected one usrp1 with usb cable to my laptop just to
check the transmission. it shows the signal in FFT sink
Hey Marcus this was very very informative.This offset was really killing me
every time when I was running the OFDM example.I think I need to order some
GPSDO :)
Marcus D. Leech 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 OF
dont use random source packet encoder is already in the ofdm block in the
gnuradio-companion. so need not to include.also try to put the screen-shot
of ur block diagram.
waqasme wrote:
>
>
> Hello sumit,
> I am trying to make OFDM trasmitter and reciever block diagram( with
> signal process
Hello sumit,
I am trying to make OFDM trasmitter and reciever block diagram( with signal
processing blocks available in GNU Radio) in GNU Radio companion. As my
supervisor asked me to make simulation first in GNU radio software then move
on to USRP. i have made this basic simulation model for OF
hello, well i followed the same steps and now i can see the different options
by typing that command benchmark_ofdm_py. -h .. now am done up till that
now i asked my supervisor to provide me the extra USRP so hopefully i will
get it soon from him. till that time i am just try to understand how i
Hi,
sorry my internet was down for almost 12 hrs... so whts the situation
now.are you able to transmit and receive
waqasme wrote:
>
> Hi Sumit,
> Thanks you so much for ur detailed explanation . i really appriciate your
> help.
> I am following the same steps as you mentioned earlier but
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 q
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 wrote:
> 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,
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 wrote:
>
> hello Johnny,
> I tried that locate command and i have found the location of the files
> .here
> is the output:
> hp
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
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 yo
Thanks johnny for your response yes i am quite new to GNU Radio so just
started to learn about this software.
Ok i will play with it and let you know the results.
Thanks for your help guys..
Waq..
Tuan Ta-2 wrote:
>
> You seem to be quite new to Linux, what do you intend to do for your
> Master
You seem to be quite new to Linux, what do you intend to do for your Master
thesis? Gnuradio is not something you can master in a couple of months.
To go to a directory, you need to use the 'cd' command. Ie
cd /usr/local/bin
My benchmark_ofdm code is not in /usr/local/bin so when you get to that
Hi Sumit,
Thanks you so much for ur detailed explanation . i really appriciate your
help.
I am following the same steps as you mentioned earlier but iam getiing this
message when i am entering these comands in terminal. here is the messages .
hp@ubuntu:~$ /usr/local/bin
bash: /usr/local/bin: is a
go to the directory /usr/local/bin
there u will find benchmark files for ofdm (both transmission and reception)
u need to type benchmark_ofdm_rx.py -h
and benchmark_ofdm_tx.py -h
these will show you the parameters u can play with.
after that u can run these files by typing ./benchmark_ofdm_tx.py
hello sumit,
yah i have replaced the GMSK modulator and demodulator with OFDM modulator
and demaodulator. but i coudlnot find message source , ,message sink, probe
signal and probe avg mag 2 with only input .. the one i have found has input
and output as well for probe avg mag 2 block... i couldno
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 wrote:
> Thanks Marcus, that was very informative!
>
> On Fri, Sep 9, 2011 at 8:00 PM, Marcus D. Leech wrote:
>
>> On 09/09/2011 07:26 PM, Tuan
Thanks Marcus, that was very informative!
On Fri, Sep 9, 2011 at 8:00 PM, Marcus D. Leech 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 wasn't success
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 system
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
recei
Great!! Thanks for your explanation!
Guanbo
On Fri, Sep 9, 2011 at 5:41 PM, Tom Rondeau wrote:
> On Fri, Sep 9, 2011 at 6:36 PM, Guanbo Zheng wrote:
>
>>
>>
>> On Fri, Sep 9, 2011 at 8:18 AM, Tom Rondeau wrote:
>>
>>> On Thu, Sep 8, 2011 at 6:47 PM, Guanbo Zheng wrote:
>>>
Hi all
>>
On Fri, Sep 9, 2011 at 6:36 PM, Guanbo Zheng wrote:
>
>
> On Fri, Sep 9, 2011 at 8:18 AM, Tom Rondeau wrote:
>
>> On Thu, Sep 8, 2011 at 6:47 PM, Guanbo Zheng wrote:
>>
>>> Hi all
>>>
>>> I am currently using OFDM benchmark to generate OFDM signal under the
>>> setting of FFT len, CP length, occ
On Fri, Sep 9, 2011 at 8:18 AM, Tom Rondeau wrote:
> On Thu, Sep 8, 2011 at 6:47 PM, Guanbo Zheng 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 r
On Thu, Sep 8, 2011 at 6:47 PM, Guanbo Zheng 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 when I change
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
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 cha
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 setu
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 us
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
http://pwnhome.wordpress.com/2011/04/19/intro-to-gnuradio-and-the-usr
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 (Transceiv
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..
>
> http://pwnhome.wordpress.com/2
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
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 not
sure how this will work and how we can put this script in GNU radio
companion to make the simulation. If any one know please guide me . i
On Fri, Jul 1, 2011 at 2:36 AM, John Waugh wrote:
> 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
> follow
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 I
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:
htt
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
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 o
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
M
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
On Thu, Jun 9, 2011 at 1:24 AM, 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 again
> Vanessa
>
>
Hi Vanessa,
One thing you might also have to change is the tx-amplitude in
transmit_path.py.
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
>
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 wrote:
> I think this email exchange contains good documentation for (part of) the
>
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 wrote:
> On Thu, J
On Thu, Jun 2, 2011 at 12:00 PM, Usman Haider wrote:
> 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, s
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
On Thu, Jun 2, 2011 at 3:10 AM, Usman Haider wrote:
> 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:
>
It's been a long time
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
sy
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 yo
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
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
Vanes
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 Mon, May 30, 2011 at 5:05 AM, vanITA1082 wrote:
>
> 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 examples from my gr
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 wrote:
>>
>>
>> On 01/17/2011 11:31 AM, Vel
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 wrote:
> Sankalp Nimbhorkar gmail.com> writes:
>
>>
>> Hi all, Can anyone provide pointers from where I can download
> OFDM implementa
Sankalp Nimbhorkar 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
>
>
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.
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 mi
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
Discuss-g
Sounds great. I'll give it a shot and report the result later.
On Sun, Feb 27, 2011 at 4:30 PM, Tom Rondeau wrote:
> On Wed, Feb 23, 2011 at 5:41 PM, Tuan (Johnny) Ta wrote:
>
>> A lot of people seem to have problem with the OFDM receiver in gnuradio.
>> Since there's no confirmation of a workin
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 wrote:
> 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 p
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
Take a look at the examples in gnuradio-examples/python/ofdm/.
benchmark_ofdm.py doesn't appear to have hardware requirements.
Cheers,
Ben
On Tue, Feb 22, 2011 at 4:03 PM, Varun Krishnamurthy
wrote:
>
>
> Hi all,
> I am trying to implement OFDM on USRP N210 using Gnu Radio.
> I haven't got the
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 slight
> 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 a
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 filte
On Mon, Jan 17, 2011 at 7:58 PM, Guanbo 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 Interp/decim rat
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 benchmark_ofdm_tx_new.py
On Mon, Jan 17, 2011 at 2:48 PM, Josh Blum 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
>> per
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?
>
Fo
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 wrote
On Tue, Jan 4, 2011 at 6:49 AM, You Lizhao 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 blocks to change
>
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
On Wed, Jan 12, 2011 at 7:36 PM, Guanbo 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 synchronization befo
On Tue, Jan 4, 2011 at 8:49 AM, You Lizhao 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 blocks to change
>
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
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,
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
http://old.nabble.com/file/p30650478/
On Mon, Jan 10, 2011 at 5:56 PM, 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 Resear
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 o
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 notice
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
Hi,
I use two different computers both running Ubuntu Lucid and gnuradio 3.2.2 !
Each of those are connected to one USRP. Both USRP uses the daughterboards
RFX2400.
I just want to test the default ofdm connection.
On one computer I'm running the transmitter script as follows:
> benchmark_ofdm_t
On Fri, Aug 27, 2010 at 12:19 PM, Srinivas 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 symbols are
> sent bet
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