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Analog-Circuit Domain Cancellation with Optimal Feedback Path Selection on Full-Duplex Relay Systems

Hayato FUKUZONO, Keita KURIYAMA, Masafumi YOSHIOKA, Toshifumi MIYAGI, Takeshi ONIZAWA

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Summary :

This paper proposes a scheme that reduces residual self-interference significantly in the analog-circuit domain on wireless full-duplex relay systems. Full-duplex relay systems utilize the same time and frequency resources for transmission and reception at the relay node to improve spectral efficiency. Our proposed scheme measures multiple responses of the feedback path by changing the direction of the main beam of the transmitter at the relay, and then selecting the optimal direction that minimizes the residual self-interference. Analytical residual self-interference is derived as the criterion to select the optimal direction. In addition, this paper considers the target of residual self-interference power before the analog-to-digital converter (ADC) dependent on the dynamic range in the analog-circuit domain. Analytical probability that the residual interference exceeds the target is derived to help in determining the number of measured responses of the feedback path. Computer simulations validate the analytical results, and show that in particular, the proposed scheme with ten candidates improves the residual self-interference by approximately 6dB at the probability of 0.01 that the residual self-interference exceeds target power compared with a conventional scheme with the feedback path modeled as Rayleigh fading.

Publication
IEICE TRANSACTIONS on Communications Vol.E106-B No.5 pp.470-477
Publication Date
2023/05/01
Publicized
2022/11/11
Online ISSN
1745-1345
DOI
10.1587/transcom.2022EBP3073
Type of Manuscript
PAPER
Category
Wireless Communication Technologies

Authors

Hayato FUKUZONO
  NTT Corporation
Keita KURIYAMA
  NTT Corporation
Masafumi YOSHIOKA
  NTT Corporation
Toshifumi MIYAGI
  NTT Corporation
Takeshi ONIZAWA
  NTT Corporation

Keyword