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arXiv · 1706.09764

Multi-tap Digital Canceller for Full-Duplex Applications

Paul Ferrand·Melissa Duarte
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Abstract

We identify phase noise as a bottleneck for the performance of digital self-interference cancellers that utilize a single auxiliary receiver---single-tap digital cancellers---and operate in multipath propagation environments. Our analysis demonstrates that the degradation due to phase noise is caused by a mismatch between the analog delay of the auxiliary receiver and the different delays of the multipath components of the self-interference signal. We propose a novel multi-tap digital self-interference canceller architecture that is based on multiple auxiliary receivers and a customized Normalized-Least-Mean-Squared (NLMS) filtering for self-interference regeneration. Our simulation results demonstrate that our proposed architecture is more robust to phase noise impairments and can in some cases achieve 10~dB larger self-interference cancellation than the single-tap architecture.

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Paul Ferrand, Melissa Duarte. 2017-06-29. Multi-tap Digital Canceller for Full-Duplex Applications. https://arxiv.org/abs/1706.09764

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