Development of an estimation technique of distant propagation characteristics beyond locality of multipath fading

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04048
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21020:Communication and network engineering-related
• Research Institution: Doshisha University
• Principal Investigator: Iwai Hisato 同志社大学, 理工学部, 教授 (70411064)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 電波伝搬 / 無線セキュリティ / 圧縮センシング / 到来方向推定 / 空間選択性変調 / 無線秘密鍵共有 / レイトレーシング

Outline of Final Research Achievements

This study aimed to develop a technique to destroy the locality of propagation characteristics for application to wireless security. As an enabling technology, a method combining array antennas with signal processing by compressed sensing was investigated. We improved the threshold setting in the processing of the compressed sensing and evaluated its performance when multi-carrier signals were used. As a result, it was shown that the system can estimate up to about 35 wavelengths, which greatly exceeds the correlation distance in a fading environment, when a multi-carrier signal is used. Regarding wireless security technology, we proposed a spatial selective modulation scheme and a secret key agreement scheme that combines quantization code word disagreement reduction and error correction codes, and clarified their performance.

Free Research Field

無線通信システムにおける電波伝搬

Academic Significance and Societal Importance of the Research Achievements

無線通信のセキュリティを実現する技術の一つとして伝搬特性を利用した無線セキュリティ技術がある。この技術は、フェージング環境の伝搬特性の局所性を原理的基盤としている。本研究で検討した技術が実現されれば、このようなセキュリティ技術に対してより容易に盗聴が可能となる。セキュリティ技術の性能向上には、本研究で対象とする方式のような高度な盗聴方式を実現し、その対策技術を検討することが重要である。