Design guideline of transmit signal for high-speed wireless transmission beyond the Nyquist criterion limit

2020 Fiscal Year Final Research Report

• Project/Area Number: 17K18871
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Research Field: Electrical and electronic engineering and related fields
• Research Institution: The University of Tokyo (2018-2020); Tokyo University of Agriculture and Technology (2017)
• Principal Investigator: Sugiura Shinya 東京大学, 生産技術研究所, 准教授 (30394927)
• Project Period (FY): 2017-06-30 – 2021-03-31
• Keywords: faster-than-Nyquist信号伝送 / 電力制御 / 伝送容量 / 変復調

Outline of Final Research Achievements

In wireless communications, the available frequency bandwidth is becoming scarce, and it is becoming increasingly important to achieve high performance in the physical layer. In this study, we present a design guideline for transmitting symbols in faster-than-Nyquist (FTN) signaling, as well as their power control. In particular, based on eigenvalue decomposition, the effect of inter-symbol interference peculiar to FTN is removed, and the mutual information content is derived to obtain the optimal power allocation. As a result, it is shown that a higher bandwidth efficiency can be achieved by the proposed FTN signaling scheme than the Nyquist-criterion counterpart, having the same root-raised cosine filter.

Free Research Field

ワイヤレス通信

Academic Significance and Societal Importance of the Research Achievements

本研究では、ナイキスト基準の限界を超える通信であるfaster-than-Nyquist (FTN) 信号伝送を対象として、情報理論の観点から得られうる利得の上限を明らかにした。このことは、さらなる高周波数利用効率が重要である次世代ワイヤレス通信システムへの適用検討に重要である。今回対象とした信号伝送方式は基本的な技術であるため、実用化時には幅広い通信システムへの波及効果が期待できる。引き続き、本技術の実用化に向けた研究に取り組んでいく。