Introducing different modulation schemes for each sub carrier in ofdm

Hi,
I am trying to implement ofdm transmission using gnu radio and I
want to
apply different modulation schemes for the different sub carriers. I
believe
the existing code does not support this. Can somebody point out the
exact
location in the source code which needs to be modified for the above
purpose? Also, is switching on and off of sub carriers possible with the
existing code?

Thanks in advance,
anma

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anma wrote:

Look in gr_ofdm_mapper_bcv and gr_ofdm_demapper_vcb.

Others have worked on this problem, too. Has anyone successfully
implemented it, yet?

Tom

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