I have been familiarizing myself with the inner guts of gnuradio and
hacked together the attached patch, applied to tag v3.3.0. It is an
extended version of gr_ofdm_cyclic_prefixer which can add cyclic
suffix and symbol overlapping, which is used in VDSL/2 standards, and
it is named gr_dmt_cyclic_extender.
I would very much appreciate your comments on the code style and any
nitpicks you may have. The commit message also explicits a problem I
encountered during coding: I believe I need some kind of “done” signal
to send whatever is stored in the block’s “memory”. How should one
solve this in gnuradio?
There is also a git repository at
with the code applied directly to master, but I’m probably missing
some python dev files as gnuradio does not build.