Hi,
I am trying to implement a spectrum sensing algorithm for cognitive radio
network.
I need to perform sensing at the receiver side.
I want my receiver to perform sensing periodically.
How can I schedule my receiver that its sensing algorithm starts working in a
regular interval of time? Ki
Thank You Marcus,
The issue is fixed now.
Regards
Chris
From: Müller, Marcus (CEL)
Sent: Wednesday, March 14, 2018 12:48 AM
To: discuss-gnuradio@gnu.org; Christopher Clement J
Subject: Re: [Discuss-gnuradio] Discuss-gnuradio] How to page down in grc
Idea
Sinan,
Unfortunately, an LDPC decoder with enough throughput for DVB-T2
(up to 50 Mbps) can't be realized on a general purpose CPU. You have to
use a GPU or FPGA. Because of that, there's no DVB-T2 receiver in GNU Radio.
If you're willing to use commercial receivers, I have a fully tested
Hi Marcus,
Yes, after some trial with the provided OFDM .grc files of the GNU Radio, I
agree with you on the flexibility of the occupied bins and pilot tones.
However, I have an issue. When, I try FFT length input that is greater than
64, I get "]: Buffer too small for
min_noutput_items" error. Af
Hi Roman,
well, it's a short term sample variance, indeed.
Is your received signal real-valued? That's surprising me a bit!
I don't think "variance per packet" is really a meaningful thing to
say. If we're talking proper variance, that's a property of a Random
Variable, not of some short observati
Marcus, great thanks for reply!
Is attached flowgraph a good approach to the variance calculation?
What should I do in case of bursty signals? Can I calculate signal variance
per packet?
Regards,
Roman
On Tue, Mar 6, 2018 at 4:57 PM, Müller, Marcus (CEL)
wrote:
> You can definitely do that! In
Idea: Scroll up. Set the dimension to (1024,1024). Save.
Close GRC. Open GRC. Open File (as different file, this one will get
garbled). Set new dimensions. Save, close, open. Better?
Why am I asking you to do that:
It seems GRC doesn't care about the dimensions you enter there. This is
unusual.
Please keep discussions on the list.
It's a bit hard to see what you're seeing without sitting in front of
your computer. The canvas is a normally scrollable GUI element. If that
doesn't work for you, it's a bug. Since GUI bugs are hard to
understand, please make a commented screen recording or so
OFDMA is a higher-level concept. Since it doesn't really apply to
IEEE802.11, no, gr-ieee802-11 isn't the best place to add it to.
Use GNU Radio's built-in OFDM framework. It's very flexible. From a
transmitter's point of view, OFDM is a MAC layer choice that only
affects the subcarriers used in e
Andy,
hm, should we at least be warning about HPFs that cut off below f_s/2?
John,
I might argue that in this specific application, the idea of "hey,
let's just subtract what we don't want" wouldn't be the worst idea;
Simply something like
input --+-->LPF---+---> Sig1
| |
Hi Marcus,
Thanks for the reply. I have an additional question. Is it possible to
implement OFDMA on the top of the gr-ieee802-11 or I need to begin with
basics like benchmark OFDM or raw OFDM. If my intention is to implement
OFDMA, what would you recommend to begin with as a reference?
Best,
Sin
Hi Chris,
normally, there's scroll bars at the side of the canvas (or your mouse
wheel works). Maybe the canvas is simply all the way scrolled down
already?
You can resize your canvas by using a (width, height) tuple in the
"Options" Block. Does increasing the height help?
Best regards,
Marcus
O
Hi Anshul,
take a look at how acquisition is done on the gr-cdma OOT module
https://github.com/anastas/gr-cdma
It is using a MF followed by a peak finder to generate flags for
the beginning of the frame which is them processed downstream.
Achilleas
Hi Anshul,
do you normalize your correlation by the received signal power in that
same window?
How's your frequency correction doing? If you don't have frequency
detection at that point, your signal might get decorrelated.
You can solve both by employing a fixed delay correlation of your
receive
Hello all,
I am trying to implement a DVB-T2 receiver's P1 symbol detection block
using C++ in GNURadio. From a non-real time code in MATLAB, I can see that
the correlation peaks during the P1 symbols are almost 50 to 100 times
larger than the rest of the time. This rise is not steep in consecutiv
> From: John Ackermann N8UR
> Date: Tue, 13 Mar 2018 09:15:33 -0400
> I'm setting up a measurement program to look at the channel power
> inside and outside a defined bandwidth centered at zero. The idea is
> to get the ratio of the power within a low pass filter (nominally 500
> H
I'm setting up a measurement program to look at the channel power inside
and outside a defined bandwidth centered at zero. The idea is to get
the ratio of the power within a low pass filter (nominally 500 Hz), and
the power in the rest of the spectrum (192 kHz) with that same 500 Hz
chunk notc
Sure, but it is an example of doing it in software with minimal latency.
You could do the same with HDLC Flags for idle symbols. That's quite common.
On Tue, Mar 13, 2018, 3:07 AM Mehmet Ozcelebi
wrote:
> I am aware of your example, you use ccsds idle frame insert as a mechanism
> to achieve con
I am making a flow graph in GRC. My flow graph extends down. I am unable to
scroll down the page. How can I do this in GRC? I do not find any option to do
this. Return key is also not working.
Regards
Chris
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I am aware of your example, you use ccsds idle frame insert as a mechanism
to achieve continous modulation. However, that is a pretty specific
implementation.
2018-03-13 6:22 GMT+03:00 Dan CaJacob :
> I've got a pretty complicated example at https://github.com/dcajacob
> /gr-ccsds However, it c
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