Hello all:
Thank you in advance.I have two questions about the symbol used in
ofdm example.
1.The first synchronization symbol is:
)).Can you explain it?
Best regards,
Kun
At 2014-11-03 00:00:29, Aditya Dhananjay adi...@cs.nyu.edu wrote:
Hello Kun,
Could you please verify whether the input to the FFT call are supposed to be
shifted or not?
Best,
Aditya
On Sun, Nov 2, 2014 at 10:44 AM, xianda wangxianda920...@163
Hi all:
Thanks in advance.
Example:gnuradio/gr-digital/examples/ofdm/rx_ofdm.grc.
If I set the sample rate of usrp equal to 1Msps,then what is the
sample rate of the output of the FFT block?Thank you very much.
Best regards,
xd
item rate is
r3 = r2/N
Then, the packet header is removed. This further reduces the rate, but
let's ignore that. It's also dependent on the packet length.
Since the FFT doesn't change the rate, what you want is most likely r3.
M
On 10/06/2014 10:36 AM, xianda wrote:
Hi all:
Thanks
.
Since the FFT doesn't change the rate, what you want is most likely r3.
M
On 10/06/2014 10:36 AM, xianda wrote:
Hi all:
Thanks in advance.
Example:gnuradio/gr-digital/examples/ofdm/rx_ofdm.grc.
If I set the sample rate of usrp equal to 1Msps,then what is
the sample
the fraction. It's N/(N+CP).
M
On 10/06/2014 11:29 AM, xianda wrote:
Hi Martin:
Thanks.But I'm confused about it.
First, data goes through the HPD, which takes out the CP. The
outgoing rate of that block is thus
r2 = (N+CP)/N * r
Now
Hi all:
Thanks in advance.I want to ask two questions:
1.Where is the source code of the block WX GUI FFT Sink?How does it
calculate the power?
2.Which version of the gnuradio start to support the USRP N210?I just
want to know the answer.Thanks.I know the latest one
Hi all:
I'm reading the source code ofdm_chanest_vcvc_impl.cc.And I don't know
this command:
// Propagate tags
std::vectorgr::tag_t tags;
get_tags_in_range(tags, 0,nitems_read(0), nitems_read(0)+framesize);
I will try my best to explain my question more
Xianda,
On 07.08.2014 08:10, xianda wrote:
Hi all:
I'm reading the source code ofdm_chanest_vcvc_impl.cc.And I don't
know this command:
// Propagate tags
std::vectorgr::tag_t tags;
get_tags_in_range(tags, 0,nitems_read(0), nitems_read(0)+framesize);
I
Hi all:
I have installed the gr_specest toolbox successfully.And I use the
gnuradio 3.7.5.But when I run the specest_from_file.py,error exists:
File /usr/local/bin/specest_from_file.py, line 142
SyntaxError: Non-ASCII character '\xce' in file
submitted a pull request. You can locally use my
change by doing
git pull https://github.com/marcusmueller/gr-specest.git fix_encoding
Greetings,
Marcus
On 06.08.2014 08:58, xianda wrote:
Hi all:
I have installed the gr_specest toolbox successfully.And I use the
gnuradio 3.7.5.But when I
or directory
Best regards,
xd
At 2014-08-06 08:09:06, Marcus Müller marcus.muel...@ettus.com wrote:
Sorry, my bad. Fixed my fix, should be clear now. Maybe you have to pull
--force, sorry about that.
On 06.08.2014 12:20, xianda wrote:
Hi Marcus:
Thank you so much.And I'm
Hi Martin:
Greeting from xd.Thank you so much for your example tx_ofdm.grc
and rx_ofdm.grc.I want to ask a question about channel estimation.And I know
that the channel estimate is on a tag.But I want to make some changes on your
example.So I just want to ask whether my
wrote:
On 07/30/2014 03:59 AM, xianda wrote:
Hi all:
I know a packet in the example tx_ofdm.grc include a preamble,a
header,the payload and crc value.Recently I have used the UHD API to
send packet.And I want to know whether the tx_ofdm.grc add
start_of_burst and end_of_burst
to know whether need I
add start_of_burst at the beginning of every packet and add end_of_burst at the
end of every packet?Am I right?
Best regards,
xd
At 2014-07-30 11:39:02, Marcus Müller marcus.muel...@ettus.com wrote:
Hi Xianda,
if you don't use gnuradio, this might not be the right list
Xianda,
I'm still not understanding completely.
Is this question about a) tx_ofdm.grc, or b) not about GNU Radio?
Best regards,
Marcus
On 30.07.2014 17:51, xianda wrote:
Hi Marcus:
Thank you so much.I just want to make some changes on the
example of tx_ofdm.grc.And I use the UHD
Hi all:
I know a packet in the example tx_ofdm.grc include a preamble,a
header,the payload and crc value.Recently I have used the UHD API to send
packet.And I want to know whether the tx_ofdm.grc add start_of_burst and
end_of_burst automatically.Namely,need I add start_of_burst at the
if you can't understand.
Thank you so much.
Best regards,
xd
At 2014-07-25 04:59:52, Marcus Müller marcus.muel...@ettus.com wrote:
Hi Xianda,
as usual, saying doesn't work, can't run, behaves wrong really
gives no clue what's wrong.
Please follow
http://gnuradio.org/redmine
...@ettus.com wrote:
Hi xianda,
tb.wait() does exactly what you said it does: Wait for the flow graph to
complete.A flowgraph will run until one of the blocks in that flowgraph
signal that they're done, or you call tb.stop().
If you don't have such a block, your tb will run forever, and wait()
will never
marcus.muel...@ettus.com wrote:
Xianda,
my advice: Please try to draw a complete picture of what you are doing.
What are your sources, blocks you interchange, your sinks, what do you
do to make your flowgraph stop (under which circumstances)? I really
can't read your mind; all I know about your flow
Hi all:
Thank you in advance.I want to ask some questions about the
Reconfiguring Flowgraphs.
My flowgraphs:
source---block A(just one block)---sink
And I want to run the flowgraphs for 30 seconds,and then run the other
flowgraphs:
I forget to say:the sink also different with each other.Namely:
source---block A(just one block)---sink1
source---block B(just one block)---sink2
Can someone help me?Thanks.
At 2014-07-21 06:50:10, xianda wangxianda920...@163.com wrote:
Hi all
wrote: On
07/13/2014 01:06 PM, xianda wrote: Hi all: Have you ever using the
gnuradio/gr-digital/examples/ofdm/rx_ofdm.grc?And I change the rx_ofdm.py as
follows: self.connect((self.digital_ofdm_chanest_vcvc_0, 1),
blocks.file_sink(gr.sizeof_gr_complex * fft_len, 'channel-estimate.dat
At 2014-07-15 05:17:35, Martin Braun martin.br...@ettus.com wrote:
On 07/15/2014 09:39 AM, xianda wrote:
Hi Martin:
Thank you for your kindly reply.
Another question I want to ask.
When I use the rx_ofdm,I add a UHD:USRP
Source.(Environment
Oh,I guess that because i receive signal which at the frequency of 2.45e9.It is
like the wifi.May be I receive the wifi signal?Am i right?
Thank you.
At 2014-07-15 05:17:35, Martin Braun martin.br...@ettus.com wrote:
On 07/15/2014 09:39 AM, xianda wrote:
Hi Martin
Hi all:
Thank you in advance.
I encouter an error:
linux; GNU C++ version 4.6.3; Boost_104800;
UHD_003.007.000-133-g6bd9fed2
GR-UHD detected ABI compatibility mismatch with UHD library.
GR-UHD was build against ABI: 3.7.1-0,
but UHD library reports
Hi all:
Have you ever using the
gnuradio/gr-digital/examples/ofdm/rx_ofdm.grc?And I change the rx_ofdm.py as
follows:
self.connect((self.digital_ofdm_chanest_vcvc_0, 1),
blocks.file_sink(gr.sizeof_gr_complex * fft_len, 'channel-estimate.dat'))
And i use the matlab:
Hi all:
Thanks in advance.
I search the mail list and find benchmark_ofdm_mimo
.(http://lists.gnu.org/archive/html/discuss-gnuradio/2012-02/msg00118.html)
But I can't find the file.Can someone tell me where can i find the file?Thanks.
Best regards,
xianda
Hi all:
Thank you in advance.
Version of gnuradio:3.7.4
I have read the
gnuradio/gr-digital/python/digital/ofdm_receiver.py,and i see:
self.connect(self, self.chan_filt)#
filter the input channel
code?
Thanks very much.
Best regards,
xianda
At 2014-06-05 10:21:54, Martin Braun martin.br...@ettus.com wrote:
On 05.06.2014 15:26, xianda wrote:
But i have read the
gnuradio/gr-digital/examples/ofdm/rx_ofdm.grc.And i think the connection
way of the code in gnuradio/gr
Hi all:
I want to know something about the forecast().
I have already known that forcast() can tell scheduler how many input
items are required for each output item.
1.But now i have read two example:
The first one:
void
Hi all:
Thank you in advance.
I want to test my understanding about ofdm_cyclic_prefixer.As this
picture say:I place a file sink before and after ofdm_cyclic_prefixer block
respectively.And the result is that file d.dat just add the 16 cp when
compared to c.dat.And maybe the
Hi all:
I know every block should have it's work or general_work function.And
i know it's used by scheduler.
Now I want to write my c++ code just call work function.Is right to do
it?
If ok,can someone explain how to call work function?
Thanks.
Best
();
gr_complex *out=buff-get_outbuf();
memcpy(buff2.front(),out,buff2.size()*sizeof(std::complexfloat));
outfile.write((char*)buff2.front(),buff2.size()*sizeof(std::complexfloat));
}
infile.close();
outfile.close();
}
Can you help me?
Thanks
Best regards,
xianda
At 2014-05-31 05:56:29, Marcus Müller
,buff2.size()*sizeof(std::complexfloat));
outfile.write((char*)buff2.front(),buff2.size()*sizeof(std::complexfloat));
}
infile.close();
outfile.close();
}
Thank you.
Best regards,
xianda
At 2014-05-31 06:33:35, Martin Braun martin.br...@ettus.com wrote:
On 31 May 2014 11:57, Marcus Müller
it?Use the c++ or write python flow
graph?Thanks.
Thank you so much.
Best regards,
xianda
At 2014-05-31 08:25:53, Marcus Müller marcus.muel...@ettus.com wrote:
Hi Xianda,
some of your emails are really hard to read due to your email client
writing non-standard-compliant HTML mail. Could you
]
[file source 2] -- [ (I)FFT ] -- [ cyclic prefixer ] -- [ USRP sink 2]
Can i realize it in grc?Or should i write the c++ code?
Thank you.Thank you.
Best regards,
xianda
At 2014-05-31 09:15:03, Marcus Müller marcus.muel...@ettus.com wrote:
Hi!
The gr-uhd USRP sink can represent multiple USRPs
/ofdm_cyclic_prefixer.hgt;.But as you said fft_complex_vcc
is a block.But now how can i call it in my code?(It's a block.It has work
function.)Can i add it's work function in my code?Thank you.br/Best
regards,br/xianda
At 2014-05-31 07:36:24, Marcus Müller marcus.muel...@ettus.com wrote:
Hi Xianda,
I just want
Hi:
Thank you in advance.
I have two simple question:
1.In the grc,i see a block: header_payload_demux
It has 3 input:in,trigger,header_data.But i see the
header_payload_demux_impl.cc:iosignature::make2(1,2,..,..).But it has 3
input,why?
Thank you.
2.fft:I see
block.Am I right?br/
Thank you.Can you explain it?Thank you.br/Best regards
At 2014-05-30 05:05:54, Martin Braun martin.br...@ettus.com wrote:
On 05/29/2014 08:07 PM, xianda wrote:
Hi:
Thank you in advance.
I have two simple question:
1.In the grc,i see a block
Hi:
Now I run the example(tx_ofdm and rx_ofdm) through two usrps.(The version
of my gnuradio is 3.7.4).
1.But in the receive part I receive two many things like this:
INFO: Detected an invalid packet at item 139632
INFO: Parser returned #f
INFO: Detected an invalid packet at item 139680
Hi Jawad:
Thank you so much for your kindly reply.
But the first problem still exist.Can you send me your test document and I
test.Thank you.
And the second problem is solved.Can you tell me why 200k is ok while 100k
failed?(they are all 10M/(even number)).Thank you.
Best regards,
xianda
any of the
warning messages from the receiver.
Regarding the sampling rate problem, I believe there is a minimal sample rate
and you can't go below it.
Regards,
Jawad
2014-05-26 14:22 GMT+02:00 xianda wangxianda920...@163.com:
Hi Jawad:
Thank you so much for your kindly reply
Hi Martin:
Thank you so much for your help.It can run.Thanks.
Best regards
xianda
At 2014-05-26 20:40:08,Martin Braun martin.br...@ettus.com wrote:
On 26.05.2014 13:03, xianda wrote:
Hi:
Now I run the example(tx_ofdm and rx_ofdm) through two usrps.(The
version of my gnuradio
Hi everyone:
I have already understand most part of the tx_ofdm.grc.But
the some digital i can't calculate accurately.
1.stream_to_tagged_stream: Packet length=96 bytes.?
2.And ofdm_carrier_allocator:FFT_length=64(but 48 occupied
Hi:
Thank you so much.
1.But from chunks to symbols I see you use the bpsk and qpsk
both.Right?What is the relationship between 800 bits and 17 symbols?Namely,how
to calculate the 17 symbols?
17*64=1088.Can you explain?
2.I have looked at your ppt about the ofdm.You say now have
Hello all:
Recently the development of the MIMO has been the focus of
intensive research.Any example codes about the MIMO(OFDM) to give someone like
me a chance to get start?
Thank you.
Best regards
___
Discuss-gnuradio
i type into the shell?
Thank you.
Best regards
在 2014-05-14 02:01:40，Tom Rondeau t...@trondeau.com 写道：
On Tue, May 13, 2014 at 1:00 PM, xianda wangxianda920...@163.com wrote:
Hello
Thank you for your patience.
And i run 3 steps:
1.copy mytx.cpp to the uhd/host
--
Mike Jameson M0MIK BSc MIET
Ettus Research Technical Support
Email: supp...@ettus.com
Web: http://ettus.com
On Thu, May 15, 2014 at 1:39 PM, xianda wangxianda920...@163.com wrote:
Hello all:
Environment: 2 usrp N210,mimo cable(they connect with each other
and share
just git pull, rebuild UHD and it will work.
Otherwise, you can set otw_format=sc16 in the streamer args and it will
solve the problem as well.
Cheers,
M
On 15.05.2014 14:55, xianda wrote:
Hi Mike
Thank you for your reply.
Now I change the addr but a new error comes:
thread[thread-per-block
and run:
git pull
cmake ../
make
sudo make install
Mike
--
Mike Jameson M0MIK BSc MIET
Email: m...@scanoo.com
Web: http://scanoo.com
On Thu, May 15, 2014 at 2:29 PM, xianda wangxianda920...@163.com wrote:
Hello
Thank you so much.
1.And i set the wire format as Complex
：
On 13.05.2014 09:35, 王先达 wrote:
Hello all
I write a c++ document mytx.cpp and i place it into the
uhd/host/build/examples.And then what should i do to let it run?Should i
type the make command in the shell or do other things?Thank you.
Best regards,
Xianda
You don't have to put
：
On 13.05.2014 09:35, 王先达 wrote:
Hello all
I write a c++ document mytx.cpp and i place it into the
uhd/host/build/examples.And then what should i do to let it run?Should i
type the make command in the shell or do other things?Thank you.
Best regards,
Xianda
You don't have to put
：
On 13.05.2014 09:35, 王先达 wrote:
Hello all
I write a c++ document mytx.cpp and i place it into the
uhd/host/build/examples.And then what should i do to let it run?Should i
type the make command in the shell or do other things?Thank you.
Best regards,
Xianda
You don't have to put
.
Best regards
在 2014-05-13 22:47:34，Tom Rondeau t...@trondeau.com 写道：
On Tue, May 13, 2014 at 9:24 AM, xianda wangxianda920...@163.com wrote:
Hello
Thank you for your reply.
1.Because i just know a little about the cmake.If i put my document
into another folder,maybe i should
?
Thank you very much.You help me a lot.
Best regards
At 2014-05-14 00:32:37,Martin Braun martin.br...@ettus.com wrote:
On 13.05.2014 17:31, xianda wrote:
Hello
Thank you a lot.
1.But now the header document in my tx.cpp is same as the
tx_waveforms.cpp.Now what should i do?How to change
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