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- W2970076462 abstract "Two long-standing bottlenecks of coded caching are the exponentially large file sizes that are needed to achieve a maximal caching gain, and - when multiple transmit antennas are involved - the large CSIT feedback costs needed for such caching gains to materialize. Recent results have addressed these two bottlenecks individually, allowing significant reductions in both. In the Multiple-Input-Single-Output (MISO) BC with L antennas, the subpacketization constraint was shown to be as small as the L-th root of the single-antenna case, while maintaining the full Degrees-of-Freedom performance, but requiring feedback from all active users. On the other hand, another result showed that the feedback cost can be reduced to feedback from only L users, but that method required a very high subpacketization. In this work we make progress towards combining the advantages of both worlds by proposing a near-optimal multiantenna coded caching algorithm that incurs a minimal feedback cost, untangled from the number of users, and simultaneously achieving an exponentially reduced subpacketization compared to the single-stream case. In particular - in the context of the L-antenna MISO BC with K single-antenna receivers equipped with caches of normalized size γ - the new algorithm achieves a DoF of (L+Kγ)(1-γ) using feedback from only L users, while also reducing subpacketization by a multiplicative factor of ([(L+Kγ)/(1+Kγ)]) <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>Kγ</sup> compared to the single-antenna case, achieving subpacketization reductions exponential to the number of antennas." @default.
- W2970076462 created "2019-09-05" @default.
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- W2970076462 creator A5038939588 @default.
- W2970076462 date "2019-07-01" @default.
- W2970076462 modified "2023-10-14" @default.
- W2970076462 title "Bridging two extremes: Multi-antenna Coded Caching with Reduced Subpacketization and CSIT" @default.
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- W2970076462 doi "https://doi.org/10.1109/spawc.2019.8815564" @default.
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