LabVIEW

cancel
Showing results for 
Search instead for 
Did you mean: 

256 QAM

Solved!
Go to solution

Hello, 

 

I have downloaded simulated QAM Modulation of an ASCII String and I'd like to know why constellation plot for 256-QAM does not display correctly. Note that I'm totally new to LabView, but we are suppose to analyze and possibly understand how this .vi works for school project 

 

Thank you for your help

256QAM256QAM

 

0 Kudos
Message 1 of 8
(1,675 Views)

What looks wrong to you?  Why? That would be a start of understanding your coursework.  

I know what the VI is doing and I see nothing wrong with the output.  We have a difference in understanding.


"Should be" isn't "Is" -Jay
0 Kudos
Message 2 of 8
(1,658 Views)

Well maybe I'm not understading it right. I thought that the dots in constellation plot were suppose to look more arranged. Like this:

128QAM128QAM

0 Kudos
Message 3 of 8
(1,628 Views)

I'd expect each ASCII value to correspond to 1 QAM, thus the spread should mimic the text.

/Y

G# - Award winning reference based OOP for LV, for free! ADDQ VIPM Now on GitHub
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
Certified-LabVIEW-Developer
0 Kudos
Message 4 of 8
(1,617 Views)

So if I'm understanding it right. One ASCII character is 8 bits and 256QAM can code up to 8 bits into one symbol meaning that if I have text of 256 ASCII characters then it should display all 256 dots?

0 Kudos
Message 5 of 8
(1,611 Views)
Solution
Accepted by topic author Ginrei

No, 'A' has ASCII 32, meaning 1 QAM combination, i'm assuming 'AAAA' would repeat the same QAM 4 times.

If you send all ASCII characters you'll have all dots. (given that i'm guessing some on how QAM works)

/Y

G# - Award winning reference based OOP for LV, for free! ADDQ VIPM Now on GitHub
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
Certified-LabVIEW-Developer
Message 6 of 8
(1,599 Views)

You are right. I tried to add some other ASCII characters and it started to display more dots. Thank you, sir!

Message 7 of 8
(1,590 Views)

Can you share this example to me? I need this for my project. 

0 Kudos
Message 8 of 8
(725 Views)