  The projected sub-THz (100 - 300 GHz) part of the upcoming 6G standard will
require a careful design of the waveform and choice of slot structure. Not only
that the design of the physical layer for 6G will be driven by ambitious system
performance requirements, but also hardware limitations, specific to sub-THz
frequencies, pose a fundamental design constraint for the waveform. In this
contribution, general guidelines for the waveform design are given, together
with a non-exhaustive list of exemplary waveforms that can be used to meet the
design requirements.
