Hi Bob,
I came up with the same issue and I hope the DC leakage from Tx should
disappear right after the Tx burst is finished, but acturally I still saw
the strong DC during the pure Rx time lot.
Have you got a solution for that? Thanks.
Br, Hanwen
2014-10-31 7:31 GMT+01:00 bob wole
Dear all,
I just want to know is there any benchmark results of the decoding speed of
the various FEC decoder in GR: CC, turbo, LDPC and polar. How much Mbps can
be achieved for these FECs respectively.
Thanks in advance.
Br, Hanwen
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Dear Johannes,
Very interesting work! I'll read it through. Many thanks.
BR, Hanwen
-- Forwarded message --
From: Johannes Demel
Date: 2016-12-07 14:17 GMT+01:00
Subject: Re: [Discuss-gnuradio] Decoding speed of the FECs in GR
To: "discuss-gnuradio@gnu.org"
. However, it'd be
more interesting to know:
- what are the TX and RX delays specifically
- what is the major part of in the delay (filters in the FPGA?)
Thanks.
Br, Hanwen
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communications between all the USRPs with the host PC is via TCP (I'm
not sure if UHD support TCP now) so that there is no packet loss.
We previously build a 2x2 MIMO using USRP2s with two ethernet adapters on
host PC, which is quite successful.
Bests,
H
TA, and I am amazed how easily in
> many RF applications those problems are “workarounded”.
>
>
>
> Ralph.
>
> ** **
>
> ** **
>
> *From:* discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:
> discuss-gnuradio-bounces+ralph=schmid@gnu
value. But it seems that this only works when
starting streaming as every frame rceived on the host side shows the same
value.
I really want to know how does the frameware handle the samples and
controlling frames. Any hints?
Thanks in advance.
Hanwen
Forget to mention, we are using GR 3.2.2, not the newer one with UDP
supported.
Cheers,
Hanwen
2010/4/21 hanwen
> Hi, *
>
> I am reading through the firmware C codes and trying to figure out how to
> carry the RSSI values from auxiliary ADC in the word0 section of each
> ethern
m the
FPGA.
BTW:
How can I generate the .bit file myself using the FPGA source code. I'm a
Layman to FPGA. :)
Bests,
Hanwen
2011/4/20 Nick Foster
> On Wed, 2011-04-20 at 10:13 +1000, Vladimir Negnevitsky wrote:
> > Hi folks,
> >
> > We've recently received an N210.
Thanks a lot for the nice answer, Josh.
2011/8/27 Josh Blum
>
> > Please send me also the n210.bit file.
> > I experience the similar problem as was presented in:
> > [Discuss-gnuradio] Getting USRP N210 running
> > http://lists.gnu.org/archive/html/discuss-gnuradio/2010-12/msg00222.html
> >
>
Hi, Nick, Vadim, Josh,
I got the same problem with two N210 in my institute, that only LED B & F is
on.
I tried to reprogram the FPGA following the thread "Bricking and recovery of
N210" but it remains the same?
Have you found how to work it out?
Cheers,
Hanwen
2010/12/
Hello Matt,
I didn't see the WBX0510 board on the Orde Page of your website. Is it
avalable for order now?
BR,
Hanwen
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.
Thanks in advance.
Hanwen
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two status bar. Would you
give me some hint?
Thanks in advance.
Hanwen
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synchronize the samples sent to
USRP2s?
Thanks in advance.
Hanwen
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regarding maybe the same issue. Has it already been solved?
Thank you in advance.
Hanwen
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nal level, or around -60
dBm.". Does the USRP outputs noise in the receive band mean the out-band
leakage of transmitted signal? And why it is around 20dBm - 80dB = -60dBm,
but not 36dBm - 80dB = -44dBm. In my opinion, the leakage signal is also
amplified
exing on a single RF port??
Thanks in advance.
Hanwen
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Hi Eric,
I read the rx_streaming_samples.cc that in opeartor() of file_writer_16sc
and file_writer_32fc, samples are copied to an array host_items and then
write to file from this array. But why not just write to file from the
*items pointer?
Hanwen
of USRP2 are
scaled?
I also noticed that in gnuradio/usrp2/host/apps/tx_samples.cc there is a
FPGA scaling using set_tx_scale_iq(). How does it work?
Thanks!
Bests,
Hanwen
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Thanks Matt.
And how does the FPGA scaling with set_tx_scale_iq() work?
2009/9/22 Matt Ettus
> hanwen wrote:
>
>> Hi GRers,
>>
>> What is the scaling of USRP2 TX/RX samples for float and short type? I
>> noticed that the absolute values of received float complex s
etadata in
tx_sample.cc in order to schedule the transmit occasion. But it seems
doesn't work. Still we are using external common 10MHz ref and 1PPS.
Thanks in advance.
Bests,
Hanwen
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http:
x27;s
the size of the buffer for samples from host?
Hanwen
2009/9/23 Doug Geiger
> hanwen wrote:
> > Hi,
> >
> > We've achieved synchronized receving with two USRP2s with independent
> > ethernet port. I'll report in another thread. Here we are beginning to
stamp to .
But it doesn't work when interporlation rate lower than 10.
Bests,
Hanwen
2009/4/15 Per Zetterberg
> Dear All,
>
> I am trying to issue 5 calls to tx_16sc (of 371 samples each i.e.,
> one ETH packet per call) to the USRP2. I transmit a simple sinuswave.
Hi Matt and Eric,
How long will it take for us enjoying the full functinal production code for
MIMO cable of USRP2. We are eager for that. *_^
Hanwen
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27;s next to get the
following command working?
git branch --track new_eth origin/new_eth
git checkout new_eth
Hanwen
2009/10/1 Matt Ettus
>
>
> I am in the process of replacing the old GigE MAC logic for the USRP2 with
> a much cleaner design. This is the first step in allowing for a
kind of
gaps.
We guess this might be caused by underrun at the transmitter side. We use
the delievered ethernet cable, so this shouldn't be the problem of bad
cable.
Anyway, how can we transmit samples contineously and stably without underrun
at 20MSamples/s??
Thanks in advnced.
Bests,
H
Hi GRers,
Is there any means of getting RSSI values from USRP2. The USRP2 motherboard
datasheet mentioned "Auxiliary analog and digital I/O support complex radio
controls such as RSSI and AGC".
Is there good start point of implementing AGC or it has already been
implemente
md;
md.timestamp = ;
md.start_of_burst = 1;
md.send_now = 0;
But it just doesn't work? If it is possible to synchronize the transmission,
could you tell us how?
Bests,
Hanwen
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Hi,
We integrate the two programs for two usrp2 seperately into one program
(configure and stream the usrp2 in one program), the problem was solved.
Cheers,
Hanwen
2009/10/30 hanwen
> Hi Talents,
>
> We are trying to synchronize multiple USRP2s for MIMO transmision. Common
> 10M
2009/12/3 hanwen
> I've applied the fix to my receiver. It works. The attachment is the
> spectrum before and after the fixing at decimation rate 4 and 5. It shows at
> decimation rate of 4 the 3dB bandwidth is really widened from 7.5MHz to
> 9.5MHz.
> But when decimation rat
ro-IF scheme, but why there is a small DUC
frequency about 254Hz?
I'm totally a layman of RF and transceiver design.
Thanks in advance!
Hanwen
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Hi,
I observed that my XCVR2450s transmit/receive DC components at carrier. This
degradeS the synchronization and demodulation performance of OFDM signal.
Anyway of eliminate it?
Thanks in advance.
Hanwen
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Thanks, Eric. Would you please tell me the exact C++ functions which do the tuning?
Is there any C++ class relating the usrp class in python?
hanwen2006/7/10, Eric Blossom <[EMAIL PROTECTED]>:
On Mon, Jul 10, 2006 at 06:16:59PM +0800, 2 1 wrote:> Hi,>> I wonder if it is possible to tune the RF fr
Hi, all:)
I've read through the code of GMSK2 and I found the difference of tune in transmit_path and receive_path.
In the transmit_path:
self.u.tune(self.subdev._which, self.subdev, target_freq)
In the receive_path:
self.u.tune(0, self.subdev, target_freq)
The self.subdev._which indicate
Hi,
Recently, I'm trying to do CDMA commnication at 1.28Mchip/s with USRP and I've met a problem.
The sample rate of DAC on USRP is 128M, so samples avialabe for each chip is 128M / 1.28M = 100.
The interpolation rate of USRP must be [4, 512] and multiple of 4. So the only choice for me seems to
Thanks. Eric. And you've had a good vocation, haven't you?
The GMSK2 code works well and the way of tuning at transmit_path and receive_path is OK.
For single channel,
In the transmit_path:
self.u.tune(self.subdev._which, self.subdev, target_freq)
In the receive_path:
se
Interesting about realtime scheduling?
What does it do and what can we benifit from it?
2006/8/2, Eric Blossom <[EMAIL PROTECTED]>:
On Tue, Aug 01, 2006 at 08:26:58PM -0400, Lee Patton wrote:> I see a single USRP underrun (uU) about four out of five times that my
> application starts. My transmit
hi, all ^_^
I'm going to implement a 2 x 2 MIMO system with USRP and I came up with some problems of using USRP as sink and source.
I'm using FLEX 2400. At the Tx side. I'm going to use two flex2400s with 1 TX/RX on each. At the Rx side, only one flex2400 is enough, I guess, because both TX/RX an
Hi, all,
I've just found that the USRP can be configure to 8bit sample by the following code.
width = 8shift = 8format = self.u.make_format(width, shift)print "format =", hex(format)r = self.u.set_format(format)
And it is already in the usrp_fft.py and usrp_oscope.py.
So I g
When I set the decimation rate to 8 or less, that is <= 8Mhz bandwidth, and still use 8bit sample, it runs well.
So it may probably not be the problem as you said. But the degradation of SNR really cannot be ignored.
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D
Hi,
It's my first time trying the new SVN repository. I'm usiing FC4.
First I downloaded and built the swig 1.3.29.
I svn the codes yesterday by:
svn co http://gnuradio.org/svn/gnuradio/trunk gnuradio
So the codes are completely new and svn reported it's release 3510.
Then I do the usual dance.
./b
ic Blossom <[EMAIL PROTECTED]>:
On Mon, Sep 11, 2006 at 10:38:40AM +0800, hanwen wrote:> Hi,> It's my first time trying the new SVN repository. I'm usiing FC4.> First I downloaded and built the swig 1.3.29.> I svn the codes yesterday by:
> svn co http://gnuradio.org/
refix=$HOME/gr",
the old definations make it wrong.
Now, I install the new version into ~/gr and succeed.
Thanks, Eric :)2006/9/11, Eric Blossom <[EMAIL PROTECTED]>:
On Mon, Sep 11, 2006 at 12:38:20PM +0800, hanwen wrote:> SWIG Version 1.3.29>> Compiled with g++ [i686-pc-li
ow of usrp_fft.py.
I wonder which part of the daughter borad is broken and if it could be repaired.
I hope Ettus Research can provide me some repair service and it's free cause the board is just bought about 5 months ago ;)
hanwen
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o you fo repairing?
Or if the condition of the board is not too bad, you may tell me which part is broken and maybe I can manage to repair it myself.
Thanks for reminding. Thank to the help of other guys in this thread. I hope we won't damage our USRP by incaution any more
Hi, everyone.
I've got a flex2400 damaged by filling signal directly into TX/RX though a cable. Now the borad can not either receive nor transmit. It seems that the flow graph always get halted.What part would be possible broken?
Can it be repaired? And what should I do to make it work again?
I've
Hi, all,
Having enjoyed GNU Radio for several months, I've got two ideas to make improvement on USRP.
As I know, making daughterboard synchronized to the mother boards and the synchronization of several motherboard will need a little modification to the boards. That is to change the locations of
Hi,
I'm intersting with the buffer mechanism of GNU Radio. Is there any document
about it? Or can someone explain it to me.
Many THANKS!
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Hi,
I've got some pieces of flex2400 in the lab, one of which runs
usrp_oscope.py at 2.45GHz for monitoring the signal power. We change
different flex2400 on another motherboard to see the difference of their
power. Surprisingly, with the same transmitter program, and the same
location of TX & RX
9862 on m'board. This two
levels of gain control are combined together in the set_gain() function. Eg.
the gain range of flex2400 RX is [0, 90] dB. 20 dB on PGA and 70dB on
AD8052.
2006/12/20, hanwen <[EMAIL PROTECTED]>:
Hi,
I've got some pieces of flex2400 in the lab, one of which
Hi, everyone,
Right now I'm doing some FDD work with USRP and flex2400. For one USRP, I
transmit signal at 2350MHz and receive at 2450MHz.
From the received waveform I found that the transmitting program interrupt
the receiving script. The received cosin wave turned out to be incontinous.
But w
Forgot to say, I'm using one port TX/RX for transmitting and receiving
simultanously, is it OK?
2007/1/9, hanwen <[EMAIL PROTECTED]>:
Hi, everyone,
Right now I'm doing some FDD work with USRP and flex2400. For one USRP, I
transmit signal at 2350MHz and receive at 2450MHz.
F
the clock is
successfully syncronized.
But I didn't burn the eeprom, so I want to know what does the burned eeprom
do?
I saw there are several version of eeprom fireware, rfx2400_tx,
rfx2400_mimo_a, rfx2400_mimo_b, what is the difference with mimo_a and
mimo_b?
Thanks.
h
Is the mblock available now? I'm eager to see some examples, but I can't
find any:)
2007/1/12, Eric Blossom <[EMAIL PROTECTED]>:
On Thu, Jan 11, 2007 at 04:25:30PM -0500, George Nychis wrote:
> Hi,
>
> I read the BBN specification on the implementation of the m-block and
other proposed
> change
Hi, everyone,
Recently, I'm implementing some synchronization algorithm in block, which
require higher efficiency. I try to use the function ccomplex_dotprod_sse()
to speed up the block, but I always get "segment fault".
I'm using a PC with Pentium D CPU, and I'm sure the ccomplex_dotprod_sse()
w
Hi, all.
Today I try an old QPSK transmission program on Basic TX/RX and failed.
However, it does work well on rfx2400.
I just simply connect TX 1 of Basic TX on transmitter to RX 1 of Basic RX on
receiver. The receiver program failed to synchronize with pilot sequence.
The carrier frequency is 1
Hi, my friends.
Our 2 x 2 MIMO-OFDM system is nearly acomplished. I'm glad to share some
details about it later.
Now I'm starting to working on a 4 x 4 one. Of course it'll needs two clock
locked USRP , 4 tx db and 4 rx db. We're using rfx2400.
From the wiki (http://gnuradio.org/trac/wiki/MultiU
Hi,
One of our rfx2400 seems not work. I've tested for a while and found:
1. the board can be identified by motherboard
2. when I plugged the db to motherboard and run some scripts, I found
there aren't any samples come to PC through USB cable. (no wave but a blank
on usrp_oscope.py)
3. the TX do
Wether it's OK to pluged the AC-to-DC converter atatched with USRP directly
on a UPS?
2007/5/15, Eric A. Cottrell <[EMAIL PROTECTED]>:
Hello,
I went to the local electronics store and got a 2 Ampere Car Adapter.
http://www.velleman.be/fr/en/product/view/?id=350662
I tried it last night and it
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