A cache-aided
K
-user Gaussian broadcast channel
(BC) is considered. The transmitter has a library of
N
equal-
rate files, from which each user demands one. The impact of
the equal-capacity receiver cache memories on the minimum
required transmit power to satisfy all user demands is studied.
Considering uniformly random demands across the library,
both the minimum average power (averaged over all demand
combinations) and the minimum peak power (minimum power
required to satisfy all demand combinations) are studied. Upper
bounds are presented on the minimum required average and peak
transmit power as a function of the cache capacity considering
both
centralized
and
decentralized
caching. The lower bounds on
the minimum required average and peak power values are also
derived assuming uncoded cache placement. The bounds for both
the peak and average power values are shown to be tight in the
centralized scenario through numerical simulations. The results
in this paper show that proactive caching and coded delivery can
provide significant energy savings in wireless networks.