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Coded caching is an information theoretic scheme to reduce high peak hourstraffic by partially prefetching files in the users local storage during lowpeak hours. This paper considers heterogeneous decentralized caching systemswhere cache of users and content library files may have distinct sizes. Theserver communicates with the users through a Gaussian broadcast channel. Themain contribution of this paper is a novel modulation strategy to map themulticast messages generated in the coded caching delivery phase to the symbolsof a signal constellation, such that users can leverage their cached content todemodulate the desired symbols with higher reliability. For the sake ofsimplicity, in this paper we focus only on uncoded modulation andsymbol-by-symbol error probability. However, our scheme in conjunction withmultilevel coded modulation can be extended to channel coding over a largerblock lengths.

Cache-Aided Modulation for Heterogeneous Coded Caching over a Gaussian Broadcast Channel