Comparative Analysis of Digital Self-Interference Cancellation Methods for Simultaneous Transmit and Receive Arrays

Author:

Hu Dujuan1ORCID,Yang Li1,Zhang Xiujun1,Xue Yan1,Wei Xizhang2,Lin Tairan2ORCID

Affiliation:

1. School of Electronic and Communication Engineering, Shenzhen Polytechnic University, Shenzhen 518055, China

2. School of Electronics and Communication Engineering, Sun Yat-Sen University, Shenzhen 518107, China

Abstract

This paper provides a comprehensive theoretical derivation of the residual noise power and effective isotropic isolation (EII) signal models in baseband digital cancellation, aperture-level digital cancellation, and beamforming spatial cancellation models in simultaneous transmit and receive (STAR) arrays. We simulated and analyzed the isolation performance and self-interference (SI) noise cancellation of STAR systems using digital SI cancellation (SIC) and beamforming in a 32-element planar array. The simulation results show that in the absence of SIC or baseband digital SIC, the EII obtained by receive adaptive beamforming (ABF) is 20 dB higher than that obtained by transmit ABF. On the basis of aperture-level digital SIC, the EII obtained from transmit ABF and receive ABF is basically the same. The EII obtained by baseband digital SIC is 22.5 dB and 41.1 dB lower than that of transmit ABF and receive ABF, respectively. Therefore, baseband digital SIC technology is not required when using transmit ABF and receive ABF.

Publisher

MDPI AG

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