Re: [Discuss-gnuradio] src/lib/general/gr_firdes.h: WIN_BLACKMAN_hARRIS = 5

2010-12-06 Thread Tuan Ta
I'm voting for it as well. fred is def a cool prof. Excuse my ignorance but am I right that fred is a co-inventor of this window? Johnny On Mon, Dec 6, 2010 at 9:13 AM, Michael Dickens wrote: > My vote: It's hilarious. But, that's after meeting Fred in person last > week & noting that, indeed,

Re: [Discuss-gnuradio] Using UHD failed to find USRP2

2010-11-17 Thread Tuan Ta
I have the same question. What is the easiest way to modify benchmark_*.py to make them work with UHD? Tuan On Mon, Nov 15, 2010 at 1:12 PM, Andrew Ge wrote: > Nick, thanks for pointing this out. Do you know whether there is some plan > to update benchmark_tx/rx.py for UHD? > > Andrew > > > On

[Discuss-gnuradio] Hackery in OFDM tunnel.py

2010-08-18 Thread Tuan Ta
Hi, Can anyone explain to me why do we need the hackery in OFDM tunnel? Is there a problem with having different transmit and receive frequencies? Thanks, Tuan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/list

Re: [Discuss-gnuradio] OFDM tunnel.py HELP REQUIRED

2010-08-05 Thread Tuan Ta
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 2411.9

[Discuss-gnuradio] How to change C++ source code and add to binary library

2010-07-19 Thread Tuan Ta
Hi, I have installed the GNU Radio Debian binary library (3.2.2) on my laptop running Ubuntu 10.04. Is there an easy way for me to make minor changes to the C++ source codes and add it to the binary library? Thank you, Tuan ___ Discuss-gnuradio mailing

Re: [Discuss-gnuradio] OFDM receiver on USRP2

2010-07-19 Thread Tuan Ta
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 tun

Re: [Discuss-gnuradio] Re: Help required tunnel.py

2010-07-08 Thread Tuan Ta
Unfortunately tunnel.py in the ofdm folder doesn't work for me either. Since you had benchmark_ofdm_* running, I would use the same settings for tunnel. I don't even have benchmark_ofdm_* going at any setting. I'm trying to get a hold of a spectrum analyzer. Hopefully it would help to clear things

Re: [Discuss-gnuradio] Re: Help required tunnel.py

2010-07-08 Thread Tuan Ta
I finally found a setting that actually works. So the real problem I think lies in the bit rate. I had no communication whatsoever in low bit rate (~250k). I started to have unreliable comm. at 500k and at 1Mbps I got no packet drops for tunnel.py. However, even at 1Mbps I still got about 5% drops

Re: [Discuss-gnuradio] Re: Help required tunnel.py

2010-07-08 Thread Tuan Ta
That's pretty much the same settings that I have. Can you clarify a bit more: - How far apart are your boards? - What options did you use to run tunnel, benchmark_ofdm_*, benchmark_*. - When you run benchmark_*, did you get a lot of packet drops at the end of transmission (about 15%)? Thanks a

Re: [Discuss-gnuradio] Re: Help required tunnel.py

2010-07-08 Thread Tuan Ta
Chuck, What hardware are you using? On Thu, Jul 8, 2010 at 10:38 AM, chuck lorres wrote: > Hi, > I have successfully run digital folders tunnel.py. > However, I am not receiving anything when i run the ofdm folder tunnel.py. > Whereas the benchmark_ofdm_tx+rx.py is running perfectly. > I have v

[Discuss-gnuradio] Re: Help required tunnel.py

2010-07-08 Thread Tuan Ta
Juan, Thanks a lot for your response. I tried stopping at the ifconfig stage and wait for both PCs to be ready before hitting enter. But all I saw was TX and no RX. Do you have any idea where the problem might be? Tuan On Wed, Jul 7, 2010 at 7:10 PM, Juan Quiroz wrote: > I have installed deb p

Re: [Discuss-gnuradio] Re: Help required tunnel.py

2010-07-07 Thread Tuan Ta
Did you manage to have an IP/TCP section working? I tried changing both the carrier threshold and interpolation, decimation values but every time I tried pinging the other USRP, I got the message 'Destination Host Unreachable'. I tried benchmark_tx/rx and always had packet drops; benchmark_ofdm_tx

Re: [Discuss-gnuradio] benchmark_tx/rx with RFX 2400

2010-07-01 Thread Tuan Ta
Sorry I forgot to edit the title in the last post. On Thu, Jul 1, 2010 at 10:28 AM, Tuan Ta wrote: > Hello all, > > I am working in the same team with Shalabh. We have been trying to figure > out this problem for a week now and so far we found nothing concrete. We > have been l

[Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 91, Issue 29

2010-07-01 Thread Tuan Ta
Hello all, I am working in the same team with Shalabh. We have been trying to figure out this problem for a week now and so far we found nothing concrete. We have been looking in every corner of the archive. We found some people who had similar problem with us (some dated back to 2008!) but no one

Re: [Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 91, Issue 21

2010-06-22 Thread Tuan Ta
That's precisely where it is. Don't know how I missed it. Thanks a lot. Johnny On Tue, Jun 22, 2010 at 4:00 PM, Thomas Tsou wrote: > On Tue, Jun 22, 2010 at 12:28 PM, Tuan Ta wrote: > > Hi all, > > > > This question might be a little bit off-topic but goin

[Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 91, Issue 21

2010-06-22 Thread Tuan Ta
Hi all, This question might be a little bit off-topic but going through the code on the transmission side, I didn't see CRC method got invoked anywhere. Though I did see that the CRC got removed and checked in the receiving side. I'd be grateful if anyone can give me a pointer. Thanks, Johnny O