University of Oulu

A. Tölli, S. P. Shariatpanahi, J. Kaleva and B. H. Khalaj, "Multi-Antenna Interference Management for Coded Caching," in IEEE Transactions on Wireless Communications, vol. 19, no. 3, pp. 2091-2106, March 2020. doi: 10.1109/TWC.2019.2962686

Multi-antenna interference management for coded caching

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Author: Tölli, Antti1; Shariatpanahi, Seyed Pooya2; Kaleva, Jarkko1;
Organizations: 1Centre for Wireless Communications, University of Oulu P.O. Box 4500, FIN-90014 University of Oulu, Finland
2School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran IR 1439957131, Iran
3Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2020-03-17


A multi-antenna broadcast channel scenario is considered where a base station delivers contents to cache-enabled user terminals. A joint design of coded caching (CC) and multigroup multicast beamforming is proposed to benefit from spatial multiplexing gain, improved interference management and the global CC gain, simultaneously. The developed general content delivery strategies utilize the multiantenna multicasting opportunities provided by the CC technique while optimally balancing the detrimental impact of both noise and inter-stream interference from coded messages transmitted in parallel. Flexible resource allocation schemes for CC are introduced where the multicast beamformer design and the receiver complexity are controlled by varying the size of the subset of users served during a given time interval, and the overlap among the multicast messages transmitted in parallel, indicated by parameters α and β, respectively. Degrees of freedom (DoF) analysis is provided showing that the DoF only depends on α while it is independent of β. The proposed schemes are shown to provide the same degrees-of-freedom at high signal-to-noise ratio (SNR) as the state-of-art methods and, in general, to perform significantly better, especially in the finite SNR regime, than several baseline schemes.

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Series: IEEE transactions on wireless communications
ISSN: 1536-1276
ISSN-E: 1558-2248
ISSN-L: 1536-1276
Volume: 19
Issue: 3
Pages: 2091 - 2106
DOI: 10.1109/TWC.2019.2962686
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported in part by the Academy of Finland grants No. 279101 and 319059, as well as 6Genesis Flagship grant No. 318927.
Academy of Finland Grant Number: 279101
Detailed Information: 279101 (Academy of Finland Funding decision)
319059 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
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