  Content delivery in a multi-user cache-aided broadcast network is studied,
where a server holding a database of correlated contents communicates with the
users over a Gaussian broadcast channel (BC). The minimum transmission power
required to satisfy all possible demand combinations is studied, when the users
are equipped with caches of equal size. A lower bound on the required transmit
power is derived, assuming uncoded cache placement, as a function of the cache
capacity. A centralized joint cache and channel coding scheme is proposed,
which not only utilizes the user's local caches, but also exploits the
correlation among the contents in the database. This scheme provides an upper
bound on the minimum required transmit power for a given cache capacity. Our
results indicate that exploiting the correlations among the contents in a
cache-aided Gaussian BC can provide significant energy savings.
