Hi,
I have used USRP N210 with CBX40 at 1.18GHz
I got a low performance when two USRP N210 communicate
I used 'benchmark_tx.py' and 'benchmark_rx.py' located at
~/gnuradio/gr-digital/example/ofdm
Commands I used are below each other :
Tx) ./benchmark_tx -f 1.18G -m qpsk --tx-gain=31.5 -W
Hi all,
The file, /gr-fft/lib/fft_vcc_fftw.cc(http://goo.gl/X8WNPh), changes domain
from frequency to time using IFFT(Inverse-Fast-Fourier-Transform).
It takes parallel subcarriers in frequency-domain (it is defined 'in' in
the file) and converts it into time-domain(it is defined 'out').
I can
> On 05/25/2016 10:20 PM, SangHyuk Kim wrote:
> > Dear all,
> >
> > Sorry, my source code was wrong.
> >
> > There is only one /d_bit_offset += d_nbits;
> >
> > /
> > /Thanks .
> > /
> >
> > 2016-05-26 10:38 GMT+09:00 SangHyuk Kim
Dear all,
Sorry, my source code was wrong.
There is only one
*d_bit_offset += d_nbits;*
*Thanks .*
2016-05-26 10:38 GMT+09:00 SangHyuk Kim <tkdgur7...@gmail.com>:
> Hi all,
>
> I'm tracing how OFDM modulation is done by /ofdm/benchmark_tx.py.
>
> The file, ofdm.py indi
Hi all,
I'm tracing how OFDM modulation is done by /ofdm/benchmark_tx.py.
The file, ofdm.py indicates ofdm modulation is composed of like :
modulation - mapper - preamble - IFFT - CP - scale
|- mapper - preamble -|
And I have a question at ofdm_mapper_bcv.
In
numbered. If UHD detects a missing packet, it* prints
> a D (to signify a Dropped packet) to stdout, and emits a new rx_time tag
> for the next packet.
>
> * Actually, I don't know whether that's UHD or gr-uhd that does this.
>
> Hope it helped
> Laur
>
> 2016-04-14 8:41
Hi all,
I'm wondering about packet sequence.
USRP sends UDP packets which is result of sampling to host PC.
UDP packets tend to be out-of-order at high speed.
My question is:
- When USRP sends UDP packet high speed to host PC, the sequence of these
packets is important ?
- Do host PC reorder
Hi all,
I'm observing packet moving using wireshark.
I used benchmark_rate --rx-rate 2500 (10 seconds) and result like below:
*Using Device: Single USRP: Device: USRP2 / N-Series Device Mboard 0:
N210r4 RX Channel: 0RX DSP: 0RX Dboard: ARX Subdev: CBX RX
Dear Marcus,
I'm always appreciated your help.
I did ./benchmark_rate --rx_rate 25e6 and it worked well.
Then, I should make it simple.
Very thanks you!
2016-04-07 18:49 GMT+09:00 Marcus Müller <marcus.muel...@ettus.com>:
> Dear SangHyuk,
>
> On 07.04.2016 08:25, SangHyuk Ki
Hi all,
I'm trying to solve Rx overflow problem.
I am using USRP N210 and CBX daughter board. As I know, my machine's
maximum sample rate is up to 25 MSps. Yes, it works well at Tx (ex
./benchmark -f 2.5G -r 2500).
However, when I use USRP to Rx mode (ex ./benchmark -f 2.5G -r 2500),
uel...@ettus.com>:
> Hi SangHyuk,
>
> On 29.03.2016 13:45, SangHyuk Kim wrote:
>
> Hi,
>
> I found two phenomenons when USRP N210 are on receiving mode (but, no
> received data)
>
>
>
> i) When I capture eth0 packets using wireshark, USRP send buffer to host
>
these...
Please give me a guide
Thanks.
2016-03-29 12:50 GMT+09:00 SangHyuk Kim <tkdgur7...@gmail.com>:
> Hi,
>
> I tried to change recv_buffer_size, but I can't find where I input buffer
> size.
>
> What is the default recv_buffer_size ?
>
> And why Tx is ok at BW 25MHz b
're getting 'D', this may be your ethernet controller--what type do
>> you have? The 82579LM is notorious for dropping data.
>> Also, make certain that your network buffering is configured
>> correctly. See the notes here:
>>
>> http://files.ettus.com/manual/page_transp
-what type do
> you have? The 82579LM is notorious for dropping data.
> Also, make certain that your network buffering is configured correctly.
> See the notes here:
>
> http://files.ettus.com/manual/page_transport.html#transport_udp_linux
>
>
>
>
> On Sun, Mar 27, 2016 a
Hi,
I'm using USRP N210 with CBX daughter board on native Ubuntu 14.04
When I open fft_uhd with sample rate about 25 MSps, it spits out of
"D"(overfow)
As I know, USRP N210 support sample rate up to 25 MSps and it's possible on
Tx mode.
I think my PC can handle this sample rate, but I don't
Hi,
I have tried to get better performance(throughput & error rate) in OFDM
packet transceiver.
I tested TxRx experiments in variety environments (modulation, frequency,
bandwidth, fft_length, occupied_carriers, gain level, packet size and etc.)
As a result, I got a poor performance and I found
ore recent OFDM blocks, so you won't get a lot of
> support here -- I recommend moving to the tx_ofdm and rx_ofdm stuff
> instead.
>
> Cheers,
> Martin
>
> On 03/24/2016 04:04 AM, SangHyuk Kim wrote:
> > Hi,
> >
> > I'm trying to understand how OFDM packet Tx w
Hi,
I'm trying to understand how OFDM packet Tx working
I checked Tx rate and I got a poor rate
(qam16, freq 1.18GHz, BW 25 MHz, pkt_size 400 --> 4.0 Mbps)
I found it's because msg_queue block when packet be inserted to tail
When Tx calls 'send_pkt(payload, ..)', it make packet and insert to
Hi,
I'm using CBX daughter board which supports from 1.2GHz to 6.0GHz with
ANT500 (from 75MHz to 1GHz).
Actually, I didn't know this antenna coverage.
I have two question.
i) Is there any problem when I use ANT500 with CBX ?
I have tested QAM and QPSK performance using OFDM using those devices
Hi,
I want to know other user's performance (avg performance).
When I operate ./benchmark_tx.py -f 1.5G -m qpsk -W 250
--fft-length=256 --tx-gain=31.5, it results up to 60Mbps. (USRP N210, CBX
40MHz, ANT500)
I empirically got fine parameters and generally (small fft length, high
bandwidth,
Hi,
I'm using gnuradio/gr-digital/example/ofdm/benchmark_tx.py and
benchmark_rx.py
You can send and receive packet using the example with some parameters
(bandwidth, frequency, etc.)
Also similar example are on
gnuradio/gr-digital/example/narrowband/benchmark_tx(rx).py.
Two benchmark examples
etter
> tool.
>
> Cheers,
> Nathan
>
> On Sun, Mar 13, 2016 at 4:22 AM, SangHyuk Kim <tkdgur7...@gmail.com>
> wrote:
>
>> Hi all.
>>
>> I'm using benchmark_tx(rx).py example
>>
>> I experimented variety modulation schemes and GMSK, BPSK, QPS
n Tue, Mar 15, 2016 at 4:13 AM, SangHyuk Kim <tkdgur7...@gmail.com>
> wrote:
>
>> Hi,
>>
>> Sorry I'm late for reply
>>
>> Did you use two device (Tx,Rx) at a time ?
>>
>> I expect like these messages on Rx machine
>>
>> ok = FALSE pk
Hi,
Sorry I'm late for reply
Did you use two device (Tx,Rx) at a time ?
I expect like these messages on Rx machine
ok = FALSE pktno = 1 n_rcvd = 1 n_right = 0
ok = FALSE pktno = 2 n_rcvd = 2 n_right = 0
ok = FALSE pktno = 3 n_rcvd = 3 n_right = 0
...
ok = TRUE pktno = N n_rcvd = N
> The first is under examples/ofdm and the other under examples/narrowband
> Which one do you need tested?
>
> BR,
> Nikos
>
> On Mon, Mar 14, 2016 at 2:04 AM, SangHyuk Kim <tkdgur7...@gmail.com>
> wrote:
>
>> Could anyone try to this example commend ?
>>
Could anyone try to this example commend ?
example code location = gnuradio/gr-digital/example/narrowband
Tx)
./benchmark_tx.py -f 1.5G -m qam -S 8
Rx)
./benchmark_rx.py -f 1.5G -m qam -S 8
Thanks.
2016-03-13 18:57 GMT+09:00 SangHyuk Kim <tkdgur7...@gmail.com>:
> Dear Nikos.
>
>
verified them to be corrupt?
>
> BR
> Nikos
>
> On Sun, Mar 13, 2016 at 10:22 AM, SangHyuk Kim <tkdgur7...@gmail.com>
> wrote:
>
>> Hi all.
>>
>> I'm using benchmark_tx(rx).py example
>>
>> I experimented variety modulation schemes and GMSK, B
Hi all.
I'm using benchmark_tx(rx).py example
I experimented variety modulation schemes and GMSK, BPSK, QPSK modulation
worked well
However, when I used QAM modulation, most of received packet were corrupted
(FALSE)
ENV)
both TX and RX uses USRP N210 with ANT500 and CBX 40MHz
distance between
-03-08 6:20 GMT+09:00 Martin Braun <martin.br...@ettus.com>:
> SangHyuk,
>
> you'll need to provide some more detail on what you're asking, what you
> want to achieve, what you're using... etc.
>
> Cheers,
> M
>
> On 03/06/2016 05:43 PM, SangHyuk Kim wrote:
>
Hi all.
I want to use high code rate for high throughput
But, I can't find proper block to do.
Can I change code rate using GNU radio?
Also, is it possible using benchmark_tx.py (one of the example file
provided) ?
Thanks.
___
Discuss-gnuradio
of course
> log2(constellation points).
>
> > Is there unlimited bit rate option for check to modulation throughput ?
>
> No, a given modulation with a given sample rate and a given samples per
> second must result in a fixed transmission rate.
>
> Best regards,
> Marcus
>
Hi all.
I'm using benchmark_tx.py and rx (/digital/example/narrowband)
As I know, ex) QAM modulation is faster than BPSK one.
However, when I used both of modulation schemes, I couldn't measure
throughput.
I think it is up to bit rate, but I don't know exactly what it is.
Is there unlimited
Hi all.
I want to make unicast communication system such as Wi-Fi using SDR(in my
case, usrp n210)
however, I can't find any block like of that.
Exactly what I'm saying like this situation :
A ---> B
C
(A; Tx packet to B, B; Rx packet from A, C; discard packet from A to B)
Is this
011?
>
> Best regards,
> Marcus
>
>
> On 21.02.2016 14:02, SangHyuk Kim wrote:
>
> I'm using "packet_decoder" (http://goo.gl/7uVDDa)
>
>
>
> 2016-02-21 21:51 GMT+09:00 Marcus Müller <marcus.muel...@ettus.com>:
>
>> Hi,
>>
>> the pr
l not sure which block you
> are using. Also, crc.check_crc32 is used in two different blocks, so I
> can't even tell this way what we are talking about :(
> Can you actually make sure twice you got the letter-for-letter right name
> of the "packet decoding" block?
>
> Best
hat "packet decoding" are you specifically talking about, and could you
> show us the code you've modified?
>
> Best regards,
> Marcus
>
>
> On 21.02.2016 12:32, SangHyuk Kim wrote:
>
> Hi, I transmit simple text file using two USRP N210
>
> Tx)
> file sou
Hi, I transmit simple text file using two USRP N210
Tx)
file source -> packet encoding -> mod(GMSK) -> usrp sink
Rx)
usrp source -> demod(GMSK) -> packet decoding -> file sink
To make corrupt packet, I tried to modify part of crc check
I guess if the crc of received packet doesn't match with
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