Re: Suggestion of some basic documents on GNU Radio modulation for baseband signal generation.

[Barry Duggan]

Khalil,

Here are some concepts you need to understand the capabilities of GNU 
Radio:
-  Complex Numbers, Negative Frequency
-  Digital signal processing
-  Frequency/Phase/Timing Offsets
-  Sampling rates / sampling theorem

1) Study the https://wiki.gnuradio.org/index.php/SuggestedReading topics 
on modulation and SDR.

2) If you have worked through the QPSK tutorial 
https://wiki.gnuradio.org/index.php/Guided_Tutorial_PSK_Demodulation, 
study each block in the flowgraph to determine what it does. 
https://wiki.gnuradio.org/index.php/Category:Block_Docs has 
documentation on every GR block.

3) If you have a specific / detailed question on an item, help can be 
found in a number of places, such as:
-  the search box in https://wiki.gnuradio.org/
-  search engines such as Google
-  search the https://lists.gnu.org/archive/html/discuss-gnuradio

Enjoy learning about SDR and GNU Radio!
--
Barry Duggan KV4FV

On Sat, 4 Apr 2020 23:07:34 +0200, Khalilur Rahman wrote:

Hello Everyone,

I hope everyone is doing well. I have a request to ask you guys.
I need to generate a baseband signal (I-Q) by using digital modulation 
techniques like QPSK. I did generate the signal. However, I do not have 
that much basic about how does it actually working. From source to sink 
points. I follow-up on the tutorial but still do not get the real idea 
behind it ( mapping points, amplitude, frequency, pulse shaping and 
etc).

So my request is to you how can I get these ideas behind it in prospect 
to GNU Radio. I did read something from books on digital modulation but 
I found myself a bit different ideas with GNU Radio.

Would anyone like to share some documents on that with the related 
environment with GNU Radio of course. Thank you in advance.

Sincerely,
Khalil