dc.contributor.author Kakar, Jaber dc.contributor.author Alameer, Alaa dc.contributor.author Chaaban, Anas dc.contributor.author Sezgin, Aydin dc.contributor.author Paulraj, Arogyaswami dc.date.accessioned 2017-12-28T07:32:12Z dc.date.available 2017-12-28T07:32:12Z dc.date.issued 2017-10-29 dc.identifier.citation Kakar, J., Alameer, A., Chaaban, A., Sezgin, A., & Paulraj, A. (2018). Delivery Time Minimization in Edge Caching: Synergistic Benefits of Subspace Alignment and Zero Forcing. 2018 IEEE International Conference on Communications (ICC). doi:10.1109/icc.2018.8422869 dc.identifier.doi 10.1109/icc.2018.8422869 dc.identifier.uri http://hdl.handle.net/10754/626483 dc.description.abstract An emerging trend of next generation communication systems is to provide network edges with additional capabilities such as additional storage resources in the form of caches to reduce file delivery latency. To investigate this aspect, we study the fundamental limits of a cache-aided wireless network consisting of one central base station, $M$ transceivers and $K$ receivers from a latency-centric perspective. We use the normalized delivery time (NDT) to capture the per-bit latency for the worst-case file request pattern at high signal-to-noise ratios (SNR), normalized with respect to a reference interference-free system with unlimited transceiver cache capabilities. For various special cases with $M=\{1,2\}$ and $K=\{1,2,3\}$ that satisfy $M+K\leq 4$, we establish the optimal tradeoff between cache storage and latency. This is facilitated through establishing a novel converse (for arbitrary $M$ and $K$) and an achievability scheme on the NDT. Our achievability scheme is a synergistic combination of multicasting, zero-forcing beamforming and interference alignment. dc.publisher Institute of Electrical and Electronics Engineers (IEEE) dc.relation.url http://arxiv.org/abs/1710.10654v2 dc.relation.url http://arxiv.org/pdf/1710.10654v2 dc.rights Archived with thanks to arXiv dc.title Delivery Time Minimization in Edge Caching: Synergistic Benefits of Subspace Alignment and Zero Forcing dc.type Preprint dc.contributor.department Communication Theory Lab dc.contributor.department Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division dc.eprint.version Pre-print dc.contributor.institution Institute of Digital Communication Systems, Ruhr-Universitat Bochum, Germany dc.contributor.institution Information Systems Laboratory, Stanford University, CA, USA dc.identifier.arxivid 1710.10654 kaust.person Chaaban, Anas refterms.dateFOA 2018-06-14T05:31:01Z
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