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학술지 Frequency-Domain RF Self-Interference Cancellation for In-Band Full-Duplex Communications
Cited 16 time in scopus Download 7 time Share share facebook twitter linkedin kakaostory
저자
Zhihong Hunter Hong, Liang Zhang, Wei Li, Yiyan Wu, Zhiwen Zhu, 박성익, 안성준, 권선형, 허남호, Eneko Iradier, Jon Montalban, Pablo Anguiera
발행일
202304
출처
IEEE Transactions on Wireless Communications, v.22 no.4, pp.2352-2363
ISSN
1536-1276
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TWC.2022.3211196
협약과제
22HH6200, 초고품질 UHD (UHQ) 전송 기술 개발, 허남호
초록
Wireless backhaul has recently gained a significant amount of interest as a cost-effective solution in comparison with conventional backhaul technologies with dedicated microwave links or fiber optics. Self-interference cancellation (SIC) is an enabling technology that allows wireless backhaul to operate in the more spectrum-efficient in-band full-duplex (IBFD) operation mode instead of the out-of-band mode. Compared to Wi-Fi IBFD transceivers, wireless in-band backhaul systems face some unique challenges, such as significantly higher transmission power and much larger propagation delay spread for the self-interference signal, especially in the low-frequency bands under 1 GHz, which often prevent accurate SIC performance. The SIC is often implemented with an interference-cancelling filter, where the filter weights are essentially the channel estimates of the self-interference signals. In this paper, a frequency-domain Radio Frequency (RF) SIC (RF-SIC) framework with a novel filter weight optimization algorithm is proposed to tackle the challenges of wireless in-band backhaul. The proposed RF-SIC does not require a dedicated training phase which needs to stop the transmission of the backhaul signal. Moreover, it has the capability of tracking the self-interference channel variation since the filter weights are updated in a block-by-block fashion.
KSP 제안 키워드
Delay spread, Enabling technologies, Fiber optic, Full duplex communication, Full-Duplex(FuDu), In-band backhaul, In-band full duplex, Operation modes, Optimization algorithm, Propagation delay, RF self-interference cancellation