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I am trying to understand the difference(s) between OFDM (Orthogonal Frequency Division Multiplexing) and GFDM (Generalized Frequency Division Multiplexing) which are used as a multicarrier modulation techniques in wireless communication. As far as I know the OFDM uses the orthogonal subcarriers and the GFDM is with the non-orthogonal subcarriers when designing a transmitter. The GFDM is possibly going to be the modulation technique for 5G systems as it has been discussed in a research area.

Could anyone please explain further about GFDM design and its differences from OFDM? What is the purpose of using GFDM when designing a transmitter? The subcarriers are created just after the IFFT?

In GFDM, how does the IFFT block work when creating the subcarriers?

What about the subcarrier pulse shaping in GFDM?

Thanks in Advance!

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This might help: webdemo.inue.uni-stuttgart.de/webdemos/08_research/waveform5‌​G/… – Deve Apr 1 '15 at 15:28
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@Deve: Thanks, that's a great link. – Jason R May 1 '15 at 20:41
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Thank you for sharing this link! Excellent explanations and spectrum showings! – tuner May 4 '15 at 9:55
    
How you know that the GFDM is possibly going to be the modulation technique for 5G system? – Val Costa Jun 26 '15 at 13:50
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Here is a nice reference in the academic literature. He starts the derivation with OFDM, then shows how GFDM can be derived from that.

In Figure 3, the pulse shaping coefficients $c_k$ precede the IFFT block.

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the link you provided does not work. – sky-light Dec 27 '16 at 14:21

protected by jojek♦ Jun 26 '15 at 16:52

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