Re: [Discuss-gnuradio] OFDM on E100

2011-11-13 Thread Nowlan, Sean
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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-18 Thread Marcus D. Leech
> > 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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-18 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-18 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-18 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-18 Thread Tom Rondeau
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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-18 Thread Marcus D. Leech
> > 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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-18 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-16 Thread Marcus D. Leech
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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-16 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-16 Thread Marcus D. Leech
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

[Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1

2011-10-16 Thread waqasme
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

[Discuss-gnuradio] OFDM on USRP2 as receiver and USRP N210 transmitter

2011-10-16 Thread Deeksha
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-10-12 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-10-12 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-26 Thread sumitstop
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-14 Thread sumitstop
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-14 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-12 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-12 Thread sumitstop
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread Tuan (Johnny) Ta
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,

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread Tuan (Johnny) Ta
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread Tuan (Johnny) Ta
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread sumitstop
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-11 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-09 Thread Colby Boyer
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-09 Thread Tuan (Johnny) Ta
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-09 Thread Marcus D. Leech
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-09 Thread Tuan (Johnny) Ta
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

Re: [Discuss-gnuradio] OFDM benchmark transmit signal bandwidth

2011-09-09 Thread Guanbo Zheng
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 >>

Re: [Discuss-gnuradio] OFDM benchmark transmit signal bandwidth

2011-09-09 Thread Tom Rondeau
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

Re: [Discuss-gnuradio] OFDM benchmark transmit signal bandwidth

2011-09-09 Thread Guanbo Zheng
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

Re: [Discuss-gnuradio] OFDM benchmark transmit signal bandwidth

2011-09-09 Thread Tom Rondeau
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-08 Thread sumitstop
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

[Discuss-gnuradio] OFDM benchmark transmit signal bandwidth

2011-09-08 Thread Guanbo Zheng
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-08 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-08 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-07 Thread sumitstop
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-07 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-05 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM Implementation

2011-09-05 Thread sumitstop
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

[Discuss-gnuradio] OFDM Implementation

2011-09-01 Thread waqasme
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

Re: [Discuss-gnuradio] OFDM preamble

2011-07-03 Thread Tom Rondeau
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

[Discuss-gnuradio] OFDM preamble

2011-06-30 Thread John Waugh
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

Re: [Discuss-gnuradio] OFDM modulation in tunnel.py example [USRP2 platform]

2011-06-30 Thread Morgan Redfield
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

[Discuss-gnuradio] OFDM modulation in tunnel.py example [USRP2 platform]

2011-06-30 Thread Juan Ramon Gutierrez
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-06-20 Thread Marcus D. Leech
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-06-20 Thread vanITA1082
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-06-09 Thread Nick Foster
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-06-09 Thread Morgan Redfield
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.

Re: [Discuss-gnuradio] OFDM on USRP2

2011-06-09 Thread vanITA1082
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 >

Re: [Discuss-gnuradio] OFDM Help

2011-06-05 Thread Usman Haider
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 >

Re: [Discuss-gnuradio] OFDM Help

2011-06-03 Thread Kunal Kandekar
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

Re: [Discuss-gnuradio] OFDM Help

2011-06-02 Thread Tom Rondeau
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

Re: [Discuss-gnuradio] OFDM Help

2011-06-02 Thread Usman Haider
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

Re: [Discuss-gnuradio] OFDM Help

2011-06-02 Thread Tom Rondeau
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

[Discuss-gnuradio] OFDM Help

2011-06-02 Thread Usman Haider
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-06-01 Thread Nick Foster
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-06-01 Thread vanITA1082
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-05-31 Thread Marcus D. Leech
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-05-31 Thread vanITA1082
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-05-30 Thread Tom Rondeau
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-05-30 Thread vanITA1082
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

Re: [Discuss-gnuradio] OFDM SoftPHY

2011-04-27 Thread Colby Boyer
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

Re: [Discuss-gnuradio] OFDM SoftPHY

2011-04-27 Thread Nemanja
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 > >

Re: [Discuss-gnuradio] OFDM problem with USRP and GRC

2011-04-25 Thread Marcus D. Leech
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.

Re: [Discuss-gnuradio] OFDM problem with USRP and GRC

2011-04-25 Thread killol
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

[Discuss-gnuradio] OFDM SoftPHY

2011-04-23 Thread Sankalp Nimbhorkar
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

Re: [Discuss-gnuradio] OFDM mod/demod test code

2011-03-03 Thread Tuan (Johnny) Ta
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

[Discuss-gnuradio] OFDM implementation

2011-03-01 Thread Varun Krishnamurthy
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

Re: [Discuss-gnuradio] OFDM mod/demod test code

2011-02-27 Thread Tom Rondeau
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

[Discuss-gnuradio] OFDM mod/demod test code

2011-02-23 Thread Tuan (Johnny) Ta
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

Re: [Discuss-gnuradio] OFDM implemrentation

2011-02-23 Thread Ben Reynwar
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

[Discuss-gnuradio] OFDM implemrentation

2011-02-22 Thread Varun Krishnamurthy
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-01-18 Thread Josh Blum
> 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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-01-18 Thread Veljko Pejovic
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

Re: [Discuss-gnuradio] OFDM receiver on USRP2

2011-01-18 Thread Tom Rondeau
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

Re: [Discuss-gnuradio] OFDM receiver on USRP2

2011-01-17 Thread Guanbo
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-01-17 Thread Tom Rondeau
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-01-17 Thread Josh Blum
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-01-17 Thread Veljko Pejovic
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

Re: [Discuss-gnuradio] OFDM Benchmark Change Modulation

2011-01-14 Thread Ben Reynwar
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 >

Re: [Discuss-gnuradio] OFDM receiver on USRP2

2011-01-13 Thread Guanbo
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

Re: [Discuss-gnuradio] OFDM receiver on USRP2

2011-01-13 Thread Tom Rondeau
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

Re: [Discuss-gnuradio] OFDM Benchmark Change Modulation

2011-01-13 Thread Tom Rondeau
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 >

Re: [Discuss-gnuradio] OFDM receiver on USRP2

2011-01-12 Thread Guanbo
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

Re: [Discuss-gnuradio] OFDM receiver on USRP2

2011-01-12 Thread Guanbo
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

Re: [Discuss-gnuradio] OFDM on USRP2

2011-01-11 Thread Guanbo
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/

Re: [Discuss-gnuradio] OFDM on USRP2

2011-01-11 Thread Tom Rondeau
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

[Discuss-gnuradio] OFDM on USRP2

2011-01-10 Thread mrahaim
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

[Discuss-gnuradio] OFDM benchmark

2011-01-07 Thread Guanbo Zheng
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

[Discuss-gnuradio] OFDM Benchmark Change Modulation

2011-01-04 Thread You Lizhao
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

[Discuss-gnuradio] ofdm decoder problem on USRP2

2010-12-01 Thread Guanbo Zheng
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

[Discuss-gnuradio] OFDM benchmark fails with TIMEOUT

2010-11-15 Thread Dimitri Block
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

Re: [Discuss-gnuradio] OFDM modulator and pilots

2010-08-27 Thread Tom Rondeau
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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