Low-Subpacketization MIMO Coded Caching with Flexible Stream Allocation
Abstract
Subpacketization remains a major obstacle to the practical deployment of coded caching (CC) in multi-antenna wireless networks. In this paper, we propose a low-complexity multiple-input multiple-output (MIMO) CC scheme that enables flexible delivery rate adaptation while substantially reducing subpacketization requirements. The proposed design employs a virtual broadcast-channel decomposition to align cache-profile placement with flexible MIMO stream elevation which extends the shared-cache model to multi-antenna receivers. This enables flexible selection of feasible user and stream configurations, thereby providing explicit control over the spatial multiplexing gain under linear decodability constraints. Analytical results show that the proposed framework can asymptotically approach the best-known achievable degrees of freedom (DoF) under linear decodability constraints while requiring orders-of-magnitude lower subpacketization than existing schemes. Numerical evaluations further demonstrate that this flexibility yields notable throughput improvements at practical signal-to-noise ratios.
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BibTeX
@misc{naseritehrani2026lowsubpacketization,
title = {{Low-Subpacketization MIMO Coded Caching with Flexible Stream Allocation}},
author = {Mohammad NaseriTehrani and MohammadJavad Salehi and Antti Tölli},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.01353},
eprint = {2606.01353},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.01353},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Low-Subpacketization MIMO Coded Caching with Flexible Stream Allocation
AU - Mohammad NaseriTehrani
AU - MohammadJavad Salehi
AU - Antti Tölli
PY - 2026
DA - 2026/10/03
PB - arXiv
DO - 10.48550/arxiv.2606.01353
UR - https://arxiv.org/abs/2606.01353
AB - Subpacketization remains a major obstacle to the practical deployment of coded caching (CC) in multi-antenna wireless networks. In this paper, we propose a low-complexity multiple-input multiple-output (MIMO) CC scheme that enables flexible delivery rate adaptation while substantially reducing subpacketization requirements. The proposed design employs a virtual broadcast-channel decomposition to align cache-profile placement with flexible MIMO stream elevation which extends the shared-cache model to multi-antenna receivers. This enables flexible selection of feasible user and stream configurations, thereby providing explicit control over the spatial multiplexing gain under linear decodability constraints. Analytical results show that the proposed framework can asymptotically approach the best-known achievable degrees of freedom (DoF) under linear decodability constraints while requiring orders-of-magnitude lower subpacketization than existing schemes. Numerical evaluations further demonstrate that this flexibility yields notable throughput improvements at practical signal-to-noise ratios.
ER -