Study on self-interference cancellation filters considering transceiver imperfections for in-band full duplex

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K14979
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21020:Communication and network engineering-related
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Miyaji Yuichi 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (50712923)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 帯域内全二重 / 自己干渉除去 / 送受信機の非線形性 / 適応信号処理

Outline of Final Research Achievements

To realize in-band full-duplex, we have studied digital self-interference cancellation filters that take into account the non-ideality of transceivers. For instance, we have developed the filter that achieves high-precision cancellation performance, low computational complexity, and fast convergence, the filter that considers the most kinds of circuit non-idealities, and the filter that better extracts circuit characteristics through prior nonlinear processing. In addition, we have conducted a theoretical analysis to validate mathematically and experiments using software radios to demonstrate the practical feasibility. These results reveal the reliability and effectiveness of the developed filters from multiple perspectives.

Free Research Field

通信工学

Academic Significance and Societal Importance of the Research Achievements

本研究成果は，帯域内全二重を実現するための回路の非理想性を考慮したディジタルフィルタ設計に関するものであるが，回路の非理想性は一般の無線機にも生じる問題であり，広く応用可能である。また，無線機を理解するための学術的側面と無線機を製作するための社会的側面の両方で重要な成果を含んでいる。今後，無線機の低廉化や高周波化によって，回路の非理想性を理解することはますます重要になり，本研究成果の意義が高まると期待される。