Multiple-antenna Placement Delivery Array for Cache-aided MISO Systems
Ting Yang, Kai Wan, Minquan Cheng, Giuseppe Caire

TL;DR
This paper introduces a new combinatorial structure called MAPDA for cache-aided MISO systems, enabling optimal sum-DoF with reduced subpacketization compared to previous schemes.
Contribution
The paper proposes MAPDA and a transformation approach to achieve optimal sum-DoF with lower subpacketization in cache-aided MISO systems, improving upon existing methods.
Findings
Achieves optimal sum-DoF $L+\frac{KM}{N}$ with subpacketization $K$ when $\frac{KM}{N}+L=K$.
Provides a construction method for MAPDA from any $g$-regular PDA.
Reduces subpacketization compared to existing schemes while maintaining optimal sum-DoF.
Abstract
We consider the cache-aided multiple-input single-output (MISO) broadcast channel, which consists of a server with antennas and single-antenna users, where the server contains files of equal length and each user is equipped with a local cache of size files. Each user requests an arbitrary file from library. The objective is to design a coded caching scheme based on uncoded placement and one-shot linear delivery, to achieve the maximum sum Degree-of-Freedom (sum-DoF) with low subpacketization. It was shown in the literature that under the constraint of uncoded placement and one-shot linear delivery, the optimal sum-DoF is . However, previously proposed schemes for this setting incurred either an exponential subpacketization order in , or required specific conditions in the system parameters , , and . In this paper, we propose a new…
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Taxonomy
TopicsCaching and Content Delivery · Cooperative Communication and Network Coding · Energy Harvesting in Wireless Networks
