Broadband Spatial Self-Interference Cancellation for Full Duplexing Array

LIN Lang; ZHAO Hongzhi; SHAO Shihai; TANG Youxi

doi:10.11999/JEIT231036

Volume 46 Issue 5

May 2024

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LIN Lang, ZHAO Hongzhi, SHAO Shihai, TANG Youxi. Broadband Spatial Self-Interference Cancellation for Full Duplexing Array[J]. Journal of Electronics & Information Technology, 2024, 46(5): 1951-1957. doi: 10.11999/JEIT231036

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LIN Lang, ZHAO Hongzhi, SHAO Shihai, TANG Youxi. Broadband Spatial Self-Interference Cancellation for Full Duplexing Array[J]. Journal of Electronics & Information Technology, 2024, 46(5): 1951-1957. doi: 10.11999/JEIT231036

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Broadband Spatial Self-Interference Cancellation for Full Duplexing Array

doi: 10.11999/JEIT231036

1.
National Key Laboratory of Wireless Communications, University of Electronic Science and Technology of China, Chengdu 611731, China
2.
Laboratory of Electromagnetic Space Cognition and Intelligent Control, Beijing 100089, China

Funds: The National Natural Science Foundation of China (U19B2014, 62071094, 61901396)

Received Date: 2023-09-21
Rev Recd Date: 2024-04-08

Available Online: 2024-04-26

Publish Date: 2024-05-30

Abstract

Abstract

The multi-functional integrated platform with simultaneous transmit and receive capability faces the strong Self-Interference (SI) coupled between the adjacent transmit and receive arrays. In this paper, a wideband SI cancellation method in the space domain for fully digital phased array systems is designed. A non-convex optimization problem is formulated to minimize the residual SI and noise power while constraining the loss of beamforming gain in the desired direction, and an alternate optimization method is proposed to jointly determine the transmit and receive beamforming weights, and the SI cancellation performance of the proposed algorithm is analyzed. Theoretical analysis and simulation results show that a 60-element array can achieve an Effective Isotropic Isolation (EII) of 168 dB when the central frequency is 2.4 GHz, the bandwidth is 100 MHz, and the beamforming gain loss is limited to 3 dB, which is 7 dB below the EII upper bound.
- Co-frequency co-time transmit and receive,
- Digital beamforming,
- Spatial self-interference cancellation

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References(15)

References

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