Re: [Discuss-gnuradio] Questions about bbn_80211b_rx.py

You mentioned the transmitter is off. What happen if you start the corresponding tx? Another thing is, you may wanna try lower sampling rate by using bigger decim rate. Best, Guanbo On Dec 5, 2012, at 4:16 PM, Kexiong Zeng wrote: > Hi all, > > I am implementing the BBN80211 pro

Re: [Discuss-gnuradio] benchmark_rx kept showing 000000...

"O" = overrun (PC not keeping up with received data from usrp or audio card) "U" = underrun (PC not providing data quickly enough) You can try to reduce the sampling rate or use a better powerful machine. :) On Thu, Jun 7, 2012 at 2:15 PM, Weixian Zhou wrote: > I had successfully transmit data

Re: [Discuss-gnuradio] What interference signals exist in 5Ghz ?

n/US/prod/collateral/wireless/ps9391/ps9393/ps9394/prod_white_paper0900aecd807395a9_ns736_Networking_Solutions_White_Paper.html Guanbo On Thu, Jun 7, 2012 at 12:47 PM, Sangho Oh wrote: > It is well know that microwaves, bluetooth, cordless phones are the major > interference sources in

Re: [Discuss-gnuradio] Remote Access to USRP testbed with GNU Radio

Thanks a lot for all the replys! Sorry that I forgot to mention I am using USRP2. I think the link is for USRP which create a usrp group for non root control. Best, Guanbo On Oct 7, 2011, at 6:01 AM, Robert McGwier wrote: > I believe people are answering the question but are slightly

[Discuss-gnuradio] Remote Access to USRP testbed with GNU Radio

USRP devices ? Are there any other settings I need to take care of, in order to implement this? Thanks a lot for any suggestions! -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/di

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

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 P

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

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. >>

[Discuss-gnuradio] OFDM benchmark transmit signal bandwidth

can change it. All I found is actual bit rate = (converter_) / xrate / samples_per_symbol = 100MHz/4/2. But this one seems not related to the BW of signal itself. Thanks for any suggestions! -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss

Re: [Discuss-gnuradio] how to decide the msgq_limit?

I have a vey similar issue in sending packets using FTW ofdm, in which I tried sending only one packet but observe much more packets in file sink. I have not figured out if it is because of msgq() or something else in lower layer Best, Guanbo On Mar 3, 2011, at 7:03 PM, Yan Nie wrote: > D

Re: [Discuss-gnuradio] FTW IEEE802.11a/g/p OFDM Frame Encoder

appreciated! Thanks, Guanbo On Tue, Feb 22, 2011 at 7:40 AM, Paul Fuxjäger wrote: > Guanbo ZHENG wrote on 22.02.11 00:36: > > > The frequency band is correct. Just now, I re-install the repository from > > the CGRAN, and tried again using: > > sudo python ftw_ofdm_tx.py -

Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

Hi Yan I did it as well, but it seem wait for infinite time before it is finished. But without the lock() and unlock(), everything returns to normal. Thanks, Guanbo On Wed, Feb 23, 2011 at 5:55 PM, Yan Nie wrote: > Hi Guanbo, > > In my case, I added a tb.wait() after the tb is

Re: [Discuss-gnuradio] how to stop the top_block and restart signal transmission

Hi, Yan I tried the similar python code as yours, as follows: tb.start() send_pkt("payload", eof=False) print "before lock()" tb.lock() print "after lock()" time.sleep(1) print "before unlock()" tb.unlock() print "after unlock()" I found out that, the last print is not showing up. Do you have

Re: [Discuss-gnuradio] FTW IEEE802.11a/g/p OFDM Frame Encoder

ry that as well. By the way, what does the USRP2 generated packet look like in Wireshark at another laptop? Thanks, Guanbo On Sun, Feb 20, 2011 at 11:32 PM, Ashutosh Grewal wrote: > Hi Guanbo, > > Thanks for your reply. > > I've some good news regarding the FTW OFDM enco

Re: [Discuss-gnuradio] FTW IEEE802.11a/g/p OFDM Frame Encoder

have saved the TCPdump file. But recently I tried to re-conduct the experiment, I can not get it anymore. :( I am still trying to figure out what problem there is. Guanbo On Sun, Feb 20, 2011 at 3:13 PM, Sankalp Nimbhorkar < sankalp.nimbhor...@gmail.com> wrote: > Dear All, >

[Discuss-gnuradio] packet sending interval

terleaved = ofdm_packet_utils.interleaver(pkt_coded , self._regime, N_cbps, N_bpsc) msg = gr.message_from_string(pkt_interleaved) self._pkt_input.msgq().insert_tail(msg) ------- Thanks -- Regards, Guanbo

Re: [Discuss-gnuradio] daughterboard performance

It is USRP2, my system setup is Ubuntu 9.04+Gnuradio3.2.2. My test codes includes the benchmark OFDM, BBN code, which i tested smoothly before both cabling and over the air. TX uses XCVR2450, the RX uses RFX2400 or DBSRX-LF. Best, Guanbo On Feb 17, 2011, at 10:42 PM, "Marcus D. Leech&qu

[Discuss-gnuradio] daughterboard performance

respectively. Furthermore, I am not able to decode some OFDM example anymore! (I compensated the correct carrier frequency already) I am wondering if I need to update something like firmware, in order to use those two new daughterboards. Thanks, -- Regards, Guanbo

Re: [Discuss-gnuradio] OFDM receiver on USRP2

e :) Thanks, Guanbo Tom Rondeau wrote: > > 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. >>

Re: [Discuss-gnuradio] OFDM receiver on USRP2

- Also, my hardware is USRP2+ XCVR2450. $ sudo python benchmark_ofdm_tx_new.py --mac-addr= -f 2.462G -m qpsk -i 100 --tx-gain=30 -M 8 -s 1000 FFT_len = 512 (default) occupie_tones=200 Tom Rondeau wrote: > > On Wed, Jan 12, 2011 at 7:36 PM, Guanbo wrote: >> >> Hi,

Re: [Discuss-gnuradio] OFDM receiver on USRP2

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: > &

Re: [Discuss-gnuradio] OFDM receiver on USRP2

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: > >

Re: [Discuss-gnuradio] OFDM on USRP2

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

[Discuss-gnuradio] Problem of Daughterboard XCVR 2450

r, the result has no luck. Does it mean the broken daughterboard? Thanks, -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

[Discuss-gnuradio] OFDM benchmark

output it in the message queue. But the questions are: Why there is PLL for carrier compensation in GR_OFDM_FRAME_SINK? Should PLL be used before FFT_DEMOD ? What is the difference between PLL here and timing and frequency synchronization in OFDM_SYNC_PN? -- Regards, Guanbo

[Discuss-gnuradio] costas_loop_cc ()

.2/gnuradio-core/src/lib/general But It seems like this C++ function is not the one they use. As I tried to print out some variable, but no observations. Sorry to disturb you guys! :( -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss-g

[Discuss-gnuradio] Re: ofdm decoder problem on USRP2

I have found out the meaning of "S" and "Time out": >From here: http://www.ruby-forum.com/topic/203035 Thank you Tom! :) On Wed, Dec 1, 2010 at 8:39 PM, Guanbo Zheng wrote: > Hi, > > I am trying to build the OFDM decoder on GRC based on the FTW 802.11a/g >

[Discuss-gnuradio] ofdm decoder problem on USRP2

sure about the number of tones, SNR. Where can I find the definition of this block? What is the meaning of S and Time out? By the way, my setup environment is ubuntu 9.04 + gnuradio 3.2.2. -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss

Re: [Discuss-gnuradio] help on BBN 802.11b code

thanks~ Tom. It is solved. Best, Guanbo On Thu, Nov 11, 2010 at 9:36 PM, Tom Rondeau wrote: > On Thu, Nov 11, 2010 at 9:59 PM, Guanbo Zheng wrote: > > Hi > > > > I tried to install the BBN 802.11b trunk from CGRAN project website, and > got > > some problems

[Discuss-gnuradio] help on BBN 802.11b code

.04 + gnuradio 3.2.2 + USRP2 + XCVR2450. I did the installation before, was successfully on USRP2. Not sure what happened this time. :( Many thanks for any advice -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://l

[Discuss-gnuradio] Re: Strange constellation appears on pi/4 dqpsk and dqpsk thru scope_sink

ike conducting additional synchronization before plotting the results. Anyone can explain more about the detail of constellation sink in GRC block? And how can we output the data in constellation sink? Many thanks -- Regards, Guanbo ___ Discuss-gnura

[Discuss-gnuradio] Re: Strange constellation appears on pi/4 dqpsk and dqpsk thru scope_sink

ike conducting additional synchronization before plotting the results. Anyone can explain more about the detail of constellation sink in GRC block? And how can we output the data in constellation sink? Many thanks -- Regards, Guanbo ___ Discuss-gnuradio mail

[Discuss-gnuradio] USRP python problem

ny suggestions! -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

[Discuss-gnuradio] carrier offset in USRP2+2.4/5GHz daugherboard

rom the standard and datasheet, it seems like 10-20ppm tolerance for USRP2, and 40ppm for Zigbee device. But I am still not sure why such large offset appears. I will appreciate for any suggestions! Many thanks -- Regards, Guanbo ___ Discuss-gnuradio mail

[Discuss-gnuradio] constellation sink block in GRC

high frequency(2.4GHz), it seems to shows NOTHING but noise..But read from FFT sink, it did show the signal. I tried to find some documents on gnuradio+GRC, but nothing much on that. Thanks -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss

[Discuss-gnuradio] USRP2 signal generator and Zigbee radio

mpling rate 3.125MHz ---- -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

[Discuss-gnuradio] cgran.org down?

Hi, I am looking for some examples in Cgran.org. But I can not log in recently. Is it down? or no longer open to all? Thanks, -- Regards, Guanbo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss