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constellation shaping
I would Like to know how I can reshape a constellation. I want to change the hypercube 16QAM constellation into two spherical constellations in matlab, Simulink. Can anyone help?
OFDM signal
I created a simple ofdm transmitter in simulink. I will like to know, after the IFFT stage and adding the CP, what should I do if I want to view the OFDM signal??? after IFFT, is it possible to view sin waves of the different frequency carriers? Please can anybody help???
Spectral flatness characterises an audio spectrum. The spectrum of a system reveals the presence or abscence of certain frequencies while the PAPR (a problem common to OFDM systems) gives a measure of howmuch the signal is into the non-linear region of the Power amplifier and can generare out of...
Calculating PAPR
Hi everyone. I just designed a simple ofdm transmitter using simulink and I will like to know if anyone could help me know how I can determine the PAPR of my system. How I can cslculate it using simulink.
Also in most ofdm systems they normalise the output after QAM modulation...
There is something I am confused with. I read the paper on cyclic prefixing and zero padding and in this paper, the signal is padded after IFFT at the transmitter. But in OFDM system designs, the zero padding is done before IFFT. What is the difference???
In OFDM system, the frequency domain input into the IFFT block comes from the data that is being modulated using techniques such as QPSK, PSK etc. after the data is modulated, it is in the frequency domain.
Thank u aya2002
Added after 1 minutes:
I also dont quite get the use of pilot symbols in the design of an OFDM system in simulink. Where should the pilot symbols be inserted? When are the pilot symbols 1 and when are they -1?
In the design of most OFDM systems before the zero padding there is an insertion of a 'zero' in the middle of the data carriers, why?
What and how do the pilot carriers work to make the OFDM system better?
I will like to understand the inputs and outputs in the mapper block of an OFDM system to better understand the nature of the inputs at the ifft block. can anyone help me?[/b]
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