University of Oulu

A. Urabe, K. Ishibashi, M. Salehi and A. Tölli, "Beamforming Design for Wireless Coded Caching with Different Cache Sizes," 2022 IEEE 23rd International Workshop on Signal Processing Advances in Wireless Communication (SPAWC), Oulu, Finland, 2022, pp. 1-5, doi: 10.1109/SPAWC51304.2022.9833813

Beamforming design for wireless coded caching with different cache sizes

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Author: Urabe, Ayaka1; Ishibashi, Koji1; Salehi, MohammadJavad2;
Organizations: 1Advanced Wireless & Communication Research Center (AWCC), The University of Electro-Communications, Tokyo, Japan
2Centre for Wireless Communications (CWC), University of Oulu, Oulu
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.4 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2023-02-13


This paper studies the performance of wireless coded caching over multiple-input and single-output (MISO) channels in a finite signal-to-noise power ratio (SNR) region when every user has a different cache memory size. We first propose multicast beamforming for the network with the conventional coded caching based on quadratic transform (QT) and then point out the non-optimality of the caching scheme when the spatial degree of freedom (DoF) is exploited. We hence formulate a new optimization problem to enhance the caching gain by minimizing the difference between the generated codewords. Numerical results confirm the non-optimality of the conventional coded caching in terms of the average transmission rate and the improvement of our proposed caching.

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Series: SPAWC
ISSN: 1948-3244
ISSN-E: 1948-3252
ISSN-L: 1948-3244
ISBN: 978-1-6654-9455-7
ISBN Print: 978-1-6654-9456-4
Article number: 9833813
DOI: 10.1109/spawc51304.2022.9833813
Host publication: 2022 IEEE 23rd International Workshop on Signal Processing Advances in Wireless Communication (SPAWC)
Conference: IEEE International Workshop on Signal Processing Advances in Wireless Communication
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research was supported by the Ministry of Internal Affairs and Communications in Japan (JPJ000254).
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