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Building on the recent coded-caching breakthrough by Maddah-Ali and Niesen,the work here considers the $K$-user cache-aided wireless multi-antenna (MISO)symmetric broadcast channel (BC) with random fading and imperfect feedback, andanalyzes the throughput performance as a function of feedback statistics andcache size. In this setting, our work identifies the optimal cache-aideddegrees-of-freedom (DoF) within a factor of 4, by identifying near-optimalschemes that exploit the new synergy between coded caching and delayed CSIT, aswell as by exploiting the unexplored interplay between caching andfeedback-quality. The derived limits interestingly reveal that --- thecombination of imperfect quality current CSIT, delayed CSIT, and coded caching,guarantees that --- the DoF gains have an initial offset defined by the qualityof current CSIT, and then that the additional gains attributed to coded cachingare exponential, in the sense that any linear decrease in the required DoFperformance, allows for an exponential reduction in the required cache size.

Fundamental Limits of Cache-Aided Wireless BC: Interplay of Coded-Caching and CSIT Feedback