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 projects now. I
"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
I checked the US spectrum allocation chart, there are some devices like
radar and satellite communication in the 5GHz bands.
Based on the comment of Cisco,
"It is generally true that fewer devices currently operating at 5 GHz are
causing interference as compared to 2.4-GHz devices. But this will c
dditional had to be done to enable this. I simply
>> logged in as the user account under which GNU Radio had been installed. The
>> machine was running Ubuntu, in case it matters.
>>
>> Kunal
>>
>>
>> On Thu, Oct 6, 2011 at 6:04 PM, Guanbo Zheng wrote:
>
Hi, all
We are interesting to build up a USRP testbed which allowed the guest remote
access to do some experiments.
I have seen someone's youtube video that they control the USRPs to transmit
different signals through SSH access.
But I want to double check if it allowed guest control of USRP devic
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
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.
>>
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
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:
> Dear
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 -
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 unlock to w
as what is used here -
> https://www.cgran.org/wiki/ftw80211ofdmtx but our USRP2 HW revision number
> is different and we used the latest firmware.
>
> Regarding BBN USRP2Version - I'll try that and get back to you in case I
> face any difficulties.
>
> Thanks,
>
> Ashu
&g
Regarding to BBN, you may try to the high interpolation and decimation rate,
as well as proper gain. I was able to decode it on RX (Ubuntu 9.10+gnuradio
3.2.2)
For FTW OFDM code, I was able to decode the 802.11g packet as well at
Wireshark using an Atheros 802.11a/b/g NIC in monitor mode, where I
Hi,
I am using the OFDM benchmark code in USRP2, where my system is Ubuntu 9.10
+ Gnuradio 3.2.2.
Basically I used the following scripting for TX and RX:
$ sudo python benchmark_ofdm_tx_new.py --mac-addr=00:50:c2:85:32:97 -f
2.462G -m qpsk -i 100 --tx-gain=30 -M 8 -s 1000 --fft-length=512
--occup
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" wrote:
Hi
I used XCVR2450 daughterboard for TX and RX on USRP2 and everything is fine.
Recently I began to use RFX2400 and DBSRX-LF, which I found out the
performance are much worse than XCVR2450.
Observed from FFT plot, I found out there are some weird spectrum response
using RFX2400 and DBSRX-LF respec
Hi,
I am using XCVR 2450 + USRP2 (Rev 4.0). Before they works fine.
However, I just found out one of them can not set frequency recently :(
The problem statement is as follows:
gbzh...@gbzheng-desktop:~/downloads/ofdm_example$ sudo python
benchmark_ofdm_tx_new.py --mac-addr=00:50:c2:85:3a:ff -f
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,
I found that for CFO compensation, there is the module named "costas_loop_cc
()"
Use it in this way: gr.costas_loop_cc(alpha, beta, max_freq, min_freq,
order)
where I can find this C++ file? I search the files, only found one
"gr_costas_loop_cc.cc" in ~/gnuradio-3.2.2/gnuradio-core/src/lib
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
>
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
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
Hi
I tried to install the BBN 802.11b trunk from CGRAN project website, and got
some problems duing "sudo make", as follows:
---
bbn_tap.cc: In constructor ‘bbn_tap::bbn_tap(std::string, int)’:
bbn_tap.cc:51: error: ‘memset’ was not declared in this scope
bbn_tap.cc:53: error:
Hi,
I also have the similar problem at the receiver side, when trying to obtain
the constellation of DQPSK.
>From constellation sink block, I can obtain much better constellation. But,
using scope sink, it shows a mess.
As far as I went through the code of constellation sink, it seems like
condu
Hi,
I also have the similar problem at the receiver side, why trying to obtain
the constellation of DQPSK.
>From constellation sink block, I can obtain much better constellation. But,
using scope sink, it shows a mess.
As far as I went through the code of constellation sink, it seems like
conduc
Hi,
I am trying to output the data of constellation sink to a file. Since
constellation sink has some synchronization process in the block, which
shows me a better constellation points compared to scope.
My gnuradio version is: V3.2.2. The constellation python code is located at:
/usr/lib/python2
Hi,
I tried to obtain the carrier offset by using the PLL block in GRC.
The transmitter is the Zigbee radio at 2.4GHz. Then, the signal is
downconverted in USRP2 souce. Two are connected by SMA cable.
As shown in the result, the frequency offset can be as large as 200KHz. Is
it correct?
>From the
Hi,
Anything knows how to set up the parameters at Constellation sink in GRC,
eg., theta, Alpha, max frequency, Mu,
I am doing some basic tests in GRC+two USRP2, trying to see how the
constellation look like. But it does not show good for DBPSK/DQPSK.
especially at RX, after downconverting from h
Hi,
I am trying to use USRP2 to generating the Gaussian noise, specifically
"usrp2_siggen_gui.py" and "usrp2_siggen.py".
I want to evaluate the performance of TmoteSky under different noise levels.
Here comes the problem:
By combining the Zigbee signal from TmoteSky sensor(transmitter) and noise
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
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