-- Forwarded message -
De: Juan Antonio
Date: jue, 14 sept 2023 a las 15:25
Subject: Can an IFFT work with non-sinusoidal signals?
To:
Actually meant stuck in the COFDM modulator
Regards
The issue would be whether an IFFT can be fed with signals of different
types, random, square or triangular. I am stuck at that point of the IFFT
modulator and knowing this could at least rule out some of my doubts.
Regards
The resolution of my monitor only allows me to see two windows
simultaneously at the gnuradio output.
Is there a way to zoom in on these windows so you can see all the outputs
simultaneously?
Best regards
I think I'm not explaining myself well again.
What I want to see in the time domain is a single carrier of an 8mhz
signal. That's why I was referring to the zero-span function of spectrum
analyzers.
I have tried to isolate a single 1K carrier using filters but I did not get
good results. That is
I must be very confused on this topic.
I understood that the zero-span function in an analyzer meant that the span
was reduced to the maximum and, from there, what you saw on the screen was
the baseband in the time domain.
I know I could try it with a filter with a few hertz of bandwidth but I
Best regards
Adding two continuous pilot carriers out of phase in time and then applying
an IFFT to them from which the frequency domain components could be removed
may seem simple but I can't do it.
Converting that results in the original time difference, not surprisingly,
much less.
Hello, for you I'm sure it's simple, but I'm having a hard time isolating a
carrier of an ofdm (1k) signal (474 Mhz for example) to see it in the time
domain.
Would someone be so kind as to tell me a method of making a bandpass filter
that would do the job?
Thank you
It is too complicated for me right now to understand or measure a gnuradio
block. However, I have seen in the oscilloscope the audio output of a
continuous pilot and it looks like a sine wave.
The question could be: Can the components of that sine wave be separated in
the time domain and thus
-- Forwarded message -
De: Juan Antonio
Date: mar, 2 mar 2021 a las 15:49
Subject: How to isolate an ofdm carrier
To:
I would appreciate if someone could tell me how to isolate an ofdm carrier
, I have tried to lower the sample rate but the carrier has only 1.1k
The problem seems every time I raise the sample rate above 8 mhz
approximately, for example when I record a dvb-t signal with gqrx.
The SDR is a hackrf and, at the moment I am finding myself with the
because I am only recording, if I tried to do another type of operations I
am almost sure
I have read what I could about the problem but it is still not clear to me
that part of the hardware (or perhaps the software) is the culprit and it
is not about spending money on a more powerful computer so that the problem
continues
Now it happens to me with the oo but I do not rule out at
Thanks Ron ,you are the best
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Hello, someone would be so kind to tell me how to download the examples of
dtv-utils?
http://www.w6rz.net/adv8dvbt12.ts
http://www.w6rz.net/adv8dvbt23.ts
etc...
No matter how hard I try it alone: 404 error or a page with many symbols
that I do not know how to transform into a ts file
Best
Hi Ron
The signal I am using has been measured with an electromagnetic field
meter. Power, BER, MER and impulse response have values well above the
average
I have been analyzing the files with baudline and there is a curious thing
in the bitmaps
While adv16.cfile and adv64.cfile have the
Thanks Ron
Now The constellation at the exit of demod reference signal now locks .
The duration of the file is 4 minutes fifty seconds 290 seconds. The four
cores work almost 100%
At the moment I have not got a TS file at the exit that have content
A question could now be:Why a file
I have been running the file for 15 minutes and it is still working even
though the file source repeater is set to no.
The constellation at the exit of the FTT block engages with 64 points
(+5), randomly engages and at 2 seconds they appear in a circular way (this
also made it to the
The idea, when I bought the hackrf, was to be able to analyze real signals,
viterbi, reed solomon , power, C/N etc ,,,
As I said before, I can record an 8K 64 QAM signal with gqrx and reproduce
it with GNURADIO without problems (just a small loss of MER) in a
conventional dvb-t receiver
At the
When I work with adv16.cfile my 4 cores work almost 100% but there is no
ovwerflow and the constellations hook
When I work with a file recorded with gqrx of 8k 1/4 2/3 64 QAM my 4 cores
work at 50%, there is no overflow and the constellations do not latch. This
same file reproduced with osmosdr
Hello, I am trying to receive a real channel of 8K 64QAM 1/4 2/3 using as a
base the example dvbt_rx_demo_8k and a hackrf
If I use the adv16.cfile file as a source, the constellation hooks
independently of whether I put 16QAM or 64 QAM (the representation is only
16 points). But if I do use the
Hello, someone would know how to calculate the impulse response of a COFDM,
DVB-T channel with an SDR device?
Thank you in advance
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