I can't really make out much in your illustration, but it looks like a textbook illustration of the power spectrum density (PSD) of three different signals; sadly, you don't really explain what you've tried so far, so it's hard to explain this based on something.
You will have to feed in these three signals into the FFT Plot. You can set the number of inputs to three, and you can transform any signal between time and frequency domain using the FFT block of GNU Radio.
Assuming you're new to GNU Radio, please have a look at the Guided Tutorials (start with parts 1 and 2), which will explain a lot of things very nicely:
http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials
Also note that there is already a fairly well-working OFDM implementation in GNU Radio, so although this might be a very educational example, you're kind of re-inventing the wheel. A lot of projects that already employ that implementation or use their own exist, for example an IEEE802.11 (WLAN) Phy layer and LTE implementations. You can build your project atop of these very good references!
Best regards,
Marcus
On 12/17/2014 06:39 PM, gaddam yamuna wrote:
Good Morning Sir,
I am an M.Tech student, want to implement ' OFDM Modulation & De
Modulation on GNU Radio'.
Sir i unable to get the OFDM modulation FFT waveform .Will you please
help in parameters of WX GUI FFT block or any settings which give clear
Frequency plot ( FFT PLOT) of OFDM Modulation like in below figure.
Thank you Sir.
.
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