Tokyo University of Agriculture and Technology

Institute of Global Innovation Research

グローバルイノベーション研究院

公開セミナー

Institute of Global Innovation Research Open Seminar

Multi-antenna Interference Managementfor Coded Caching
言語 / 英語 Language/English
Tuesday, Oct 15 , 2019, 16:30-18:00

東京農工大学 小金井キャンパス 13号館 4階 講義室 L1341
Lecture Room L1341, 4th Fl., Building 13, Koganei Campus, TUAT

Dr. Antti Tölli

Associate Professor
Centre for Wireless Communications, University of Oulu (Finland)

Antti Tölli (M'08, SM'14) received the Dr.Sc. (Tech.) degree in electrical engineering from theUniversity of Oulu, Oulu, Finland, in 2008. Before joining the Centre for Wireless Communications(CWC) at the University of Oulu, he worked for 5 years with Nokia Networks as a Research Engineerand Project Manager both in Finland and Spain. In May 2014, he was granted a ﬁve year (2014-2019)
Academy Research Fellow post by the Academy of Finland. Currently, he also holds an Associate
Professor position with the University of Oulu. During the academic year 2015-2016, he visited atEURECOM, Sophia Antipolis, France, while from August 2018 till June 2019 he is visiting University ofCalifornia - Santa Barbara, USA. He has authored numerous papers in peer-reviewed internationaljournals and conferences and several patents all in the area of signal processing and wirelesscommunications. His research interests include radio resource management and transceiver designfor broadband wireless communications with a special emphasis on distributed interference
management in heterogeneous wireless networks. He is currently serving as an Associate Editor forIEEE Transactions on Signal Processing.

Abstract
In Coded Caching (CC), instead of simply replicating high-popularity contents near-or-at end-users, the network should
spread diﬀerent contents at diﬀerent caches such that common coded messages broadcast during the network high-peakhours to diﬀerent users with diﬀerent demands would beneﬁt all the users simultaneously. In this talk, a multi-antennabroadcast channel scenario is considered where a base station delivers contents to cache-enabled user terminals. A joint
design of 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 impactof both noise and inter-stream interference from coded messages transmitted in parallel. Moreover, reduced complexity
alternatives, with a small loss in performance, are introduced by controlling the size of the subset of users served during agiven time interval, and the overlap among the multicast messages transmitted in parallel, indicated by parameters α andβ, respectively. Degrees of freedom (DoF) analysis is provided showing that the DoF only depends on α while it isindependent of β. The proposed schemes are shown to provide the same degrees-of-freedom at high SNR as the state-of-art
methods and, in general, to perform signiﬁcantly better, especially in the ﬁnite SNR regime, than several baseline schemes.

■共催 ⁄ Co-organized by
グローバルイノベーション研究院 食料分野 梅林チーム
Institute of Global Innovation Research ”Food” Umebayashi Team
卓越大学院プログラム
Excellent Leader Development for Super Smart Society
by New Industry Creation and Diversity■お問合せ先 / Contact
グローバルイノベーション研究院 工学研究院 梅林健太
Institute of Global Innovation Research, Institute of Engineering
Associate Professor Kenta Umebayashi
e-mail: ume̲k ( ここに @ を入れてください）cc.tuat.ac.jp
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