Methods and apparatuses for canceling self-interference in an RF transceiver

The described self-interference cancelation method in RF transceivers uses amplification circuitry to replicate reception path characteristics with reduced gain, effectively canceling interference in the analog domain, enhancing radar and communications performance with minimal hardware changes.

WO2026130689A1PCT designated stage Publication Date: 2026-06-25TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Filing Date
2024-12-18
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing RF transceivers face challenges in mitigating self-interference (SI) during full duplex operations, particularly in devices like mobile phones and AR glasses, due to the complexity and size constraints of existing hardware modifications required for effective SI cancelation.

Method used

A polarity-reversed self-interference cancelation technique using amplification circuitry that replicates the wideband frequency characteristics of the reception path, with reduced gain, to generate an amplified, polarity-reversed version of the transmit signal, which is combined with the composite signal to cancel interference, implemented in the analog domain with minimal hardware changes.

Benefits of technology

This approach achieves effective self-interference cancellation with reduced noise contribution, allowing for higher transmit power and improved radar and communications performance in RF transceivers, while minimizing hardware complexity and size.

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Abstract

Disclosed methods and apparatuses embody techniques for the cancelation of self-interference (SI) in radiofrequency (RF) transceivers (20), where self-interference refers to an outgoing transmit signal (58) interfering with an incoming received signal (56). An advantageous aspect of the disclosed techniques involves creating a polarity-reversed version of the transmit-signal interference seen in the reception path, using amplification circuitry (78) that replicates the wideband frequency characteristics of the reception-path amplification, for good interference cancelation, while also operating the amplification circuitry (78) at reduced gain relative to the reception-path amplification, to avoid excessive noise contribution via the interference cancelation. The techniques apply readily to the simultaneous transmission of a radar signal and reception of a corresponding radar return signal and / or reception of a communications signal.
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