(https://cc.oulu.fi/~atolli/)
GROW Seminar Series: Global Researcher Outreach for Wireless
Day: March 11th 2026
Time: 9:10-10:40 (10min coffee break) 10:50-12:20 (JST)
Entry from 9:00 AM, departure by 12:30 PM.
Venue:
1-12-8 Hakataeki-Higashi, Hakata-ku, Fukuoka-shi, Fukuoka 812-0013, Japan (福岡県福岡市博多区博多駅東1-12-8)
https://maps.app.goo.gl/DXoPLkakwi15oEiN9
Room: 「ふれあい貸し会議室 Premium トヨタレンタリース博多駅前A」
Language: English
Title: Capacity of Linear Time-Invariant Gaussian Channels
Abstract: This lecture reviews core information theoretic quantities (entropy, joint and conditional entropy, chain rule, and mutual information) and uses them to define channel capacity for discrete memoryless channels as the maximum mutual information over input distributions. It then extends the framework to continuous variables via differential entropy and derives the AWGN capacity under an average power constraint, including an intuitive sphere packing interpretation and the tradeoff between power and bandwidth in continuous time. Finally, it applies the AWGN capacity results to linear time invariant Gaussian channels, covering SIMO and MISO links (via matched filtering and beamforming) and frequency selective channels, where OFDM yields parallel subchannels and optimal power allocation follows the waterfilling solution from KKT conditions.
Bio: Antti Tölli (M’08–SM’14) is a Professor with the Centre for Wireless Communications (CWC), University of Oulu, Finland. He received the D.Sc. (Tech.) degree in Electrical Engineering from the University of Oulu in 2008. From 1998 to 2003, he worked at Nokia Networks as a Research Engineer and Project Manager in both Finland and Spain. In 2014, he was awarded a five-year Academy Research Fellow position by the Research Council of Finland. During 2015–2016, he was a Visiting Researcher at EURECOM, Sophia Antipolis, France, and from August 2018 to June 2019, he was a Visiting Scholar at the University of California, Santa Barbara, USA. He has contributed extensively to the field of wireless communications through numerous publications in leading international journals, conference records, and book chapters, and he also holds several patents. His research focuses on signal processing for wireless networks, communication, and information theory. From 2017 to 2019, he served as an Associate Editor for the IEEE Transactions on Signal Processing and is currently serving as an Editor for the IEEE Transactions on Wireless Communications.
Registration:
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Participation Fee: Free of charge