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Analog Baseband Self-Interference Canceler with Digitally Generated Replica Signal for Full Duplex

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Abstract

This paper presents a novel transceiver architecture for in-band full duplex radio. A transceiver for full duplex radio requires a self-interference (SI) canceler to remove the SI occurring from the transmitter to the receiver, and a full duplex transceiver generally has two SI cancelers: one at the analog RF stage and the other at the baseband stage. The output from the SI canceler at the RF stage includes much residual SI, and it decreases the number of bits allocated to the analog baseband signal at the analog-to-digital converter. A 1-tap analog baseband SI canceler that uses a replica signal including only the direct path component of the residual SI has been presented for preventing degradation. However, the architecture cannot remove the SI well due to the high Ricial K-factor. To address the problem, the presented architecture has an SI canceler at the analog baseband stage, and this canceler employs a replica signal that is output from a digital-to-analog converter. Because the replica signal is generated in the digital domain, the architecture can generate a multipath replica signal, and improved performance can be expected. Numerical and theoretical analyses are shown to validate the effectiveness of the presented architecture.

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Acknowledgements

This work was supported by JSPS KAKENHI Grant Number JP19K04374.

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  1. Faculty of Engineering, Mie University, 1577, Kurimamachiyacho, Tsu, Mie, 514-8507, Japan

    Shusuke Narieda

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  1. Shusuke Narieda
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Correspondence to Shusuke Narieda.

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Narieda, S. Analog Baseband Self-Interference Canceler with Digitally Generated Replica Signal for Full Duplex. Wireless Pers Commun 126, 1769–1788 (2022). https://doi.org/10.1007/s11277-022-09821-9

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