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Self-mixed self-interference analog cancellation in full-duplex communications

Abstract

Rather than using existing self-interference cancellation methods, which essentially consist of reconstruction and subtraction, this paper proposes a novel approach, based on multiplication, to cancel selfinterference in the analog domain in full-duplex communications. This approach is called self-mixed selfinterference analog cancellation (SM-SIAC). Moreover, rather than using an individual analog cancellation circuit in existing self-interference cancellation methods, SM-SIAC can merge the analog cancellation circuit and the receiver. SM-SIAC is configured with three auto-tuning loops, consisting of one delay loop and two gain loops. SM-SIAC is further simplified with the Gaussian minimum shift keying (GMSK) self-interference signal. When these loops converge, the paper analyzes the cancellation capacity and derives a closed-form expression for the quadrature amplitude modulation self-interference signal and the GMSK self-interference signal. Simulation results illustrate the convergence of the gain loops and the cancellation capacity in the presence of engineering errors.

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Correspondence to Shihai Shao.

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Lu, H., Shao, S., Deng, K. et al. Self-mixed self-interference analog cancellation in full-duplex communications. Sci. China Inf. Sci. 59, 042303 (2016). https://doi.org/10.1007/s11432-015-5365-z

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Keywords

  • self-interference cancellation
  • full-duplex
  • self-mixed
  • analog cancellation
  • auto-tuning