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We consider the cache-aided MISO broadcast channel (BC) in which amulti-antenna transmitter serves $K$ single-antenna receivers, each equippedwith a cache memory. The transmitter has access to partial knowledge of thechannel state information. For a symmetric setting, in terms of channelstrength levels, partial channel knowledge levels and cache sizes, wecharacterize the generalized degrees of freedom (GDoF) up to a constantmultiplicative factor. The achievability scheme exploits the interplay betweenspatial multiplexing gains and coded-multicasting gain. On the other hand, acut-set-based argument in conjunction with a GDoF outer bound for a parallelMISO BC under channel uncertainty are used for the converse. We further showthat the characterized order-optimal GDoF is also attained in a decentralizedsetting, where no coordination is required for content placement in the caches.

Generalized Degrees of Freedom of the Symmetric Cache-Aided MISO Broadcast Channel with Partial CSIT