  Newer cellular communication generations are planned to allow asynchronous
transmission of multiple numerologies (waveforms with different parameters) in
adjacent bands, creating unavoidable adjacent channel interference. Most prior
work on windowing assume additional extensions reserved for windowing, which
does not comply with standards. Whether windowing should be applied at the
transmitter or the receiver was not questioned. In this work, we propose two
independent algorithms that are implemented at the transmitter and receiver,
respectively. These algorithms estimate the transmitter and receiver windowing
duration of each resource element (RE) with an aim to improve fair proportional
network throughput. While doing so, we solely utilize the available extension
that was defined in the standard and present standard-compliant algorithms that
also do not require any modifications on the counterparts or control signaling.
Furthermore, computationally efficient techniques to apply per-RE transmitter
and receiver windowing to signals synthesized and analyzed using conventional
cyclic prefix orthogonal frequency division multiplexing are derived and their
computational complexities are analyzed. The spectrotemporal relations between
optimum window durations at either side, as well as functions of the excess
signal to noise ratios, the subcarrier spacings and the throughput gains
provided over previous similar techniques are numerically verified.
