16QAM-OFDM Modulator using Comm Toolbox in Simulink, What is the Number of Symbols?
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I would like to build a 16QAM Coded OFDM Time Signal. Mainly to mimic an LTE 20MHz BW signal up converted to 800MHz for use in an RF model I'm building in Simulink.
I was going to have a random datastream of Fs = 20MHz that is then coded using the "Rectangular QAM Modulator BB Block" which then is inputted to the OFDM modulator to get the OFDM signal out. Then I would upsample using the Raised Cosine Filter to a proper sample rate to up convert to 800MHz. The problem I am running into is what the "Number of OFDM Symbols" is.
Do I need to convert the QAM serial signal into Parallel data streams first? Say my sample per frame is 20, I could then parallel this into 10x2 which is an FFT size of 10 (assuming no guard bands or DC null), and 2 symbols?
I guess I'm confused by the meaning of "Number of Symbols" even though it says it's the number of symbols in the time frequency grid.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/163311/image.png)
2 Comments
Answers (1)
Chandresh Vora
on 6 Jun 2016
Here is an example in the product that shows the use of QAM Baseband Modulator with OFDM Modulator - hope this helps.
Thanks, Chandresh Vora
2 Comments
Meshal Sinnen
on 10 Apr 2019
Hey Chandresh the link you shared doesn't work anymore - do you have any other link. I am trying to achieve the same thing as Nicco
Chandresh Vora
on 17 Jun 2019
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