  We investigate the potentials of applying the coded caching paradigm in
wireless networks. In order to do this, we investigate physical layer schemes
for downlink transmission from a multiantenna transmitter to several
cache-enabled users. As the baseline scheme we consider employing coded caching
on top of max-min fair multicasting, which is shown to be far from optimal at
high SNR values. Our first proposed scheme, which is near-optimal in terms of
DoF, is the natural extension of multiserver coded caching to Gaussian
channels. As we demonstrate, its finite SNR performance is not satisfactory,
and thus we propose a new scheme in which the linear combination of messages is
implemented in the finite field domain, and the one-shot precoding for the MISO
downlink is implemented in the complex field. While this modification results
in the same near-optimal DoF performance, we show that this leads to
significant performance improvement at finite SNR. Finally, we extend our
scheme to the previously considered cache-enabled interference channels, and
moreover, we provide an Ergodic rate analysis of our scheme. Our results convey
the important message that although directly translating schemes from the
network coding ideas to wireless networks may work well at high SNR values,
careful modifications need to be considered for acceptable finite SNR
performance.
