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Journal Article
Frequency-Domain RF Self-Interference Cancellation for In-Band Full-Duplex Communications
- Authors
- Zhihong Hunter Hong, Liang Zhang, Wei Li, Yiyan Wu, Zhiwen Zhu, Sung-Ik Park, Sungjun Ahn, Sunhyoung Kwon, Namho Hur, Eneko Iradier, Jon Montalban, Pablo Anguiera
- Issue Date
- 2023-04
- Citation
- IEEE Transactions on Wireless Communications, v.22 no.4, pp.2352-2363
- ISSN
- 1536-1276
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Project Code
- 22HH6200, Development of Transmission Technology for Ultra High Quality UHD, Namho Hur
- Abstract
- 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 Keywords
- 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