Wireless Transceiver Leakage Cancellation for Accurate Radar Detection

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Solution Overview

Problem

Conventional wireless devices suffer from interference between transmit and receive chains due to leakage, which affects the accuracy of radar detection operations.

Innovation Solution

Implementing sequential and dynamic interference cancellation operations using voltage attenuators, phase shifters, and adaptive filters to mitigate interference in the receive chain, with adjustments made based on interference determinations and calibration processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If transmit and receive chains are integrated in a wireless device, then the device can perform full-duplex operations and improve productivity, but interference from transmit chain leakage degrades measurement precision of received signals

Engineering Contradiction:

Improvefull-duplex operation capabilityVSAvoidreceived signal accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The interference cancellation process is segmented into multiple stages: initial interference determination, first interference cancellation operation using voltage attenuator and phase shifter, second interference cancellation operation using adaptive filter, and residual interference handling. Each stage addresses specific portions of the interference problem sequentially.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A dedicated interference cancellation circuit is introduced as an intermediary component between the transmit and receive chains. This circuit includes voltage attenuators, phase shifters, and adaptive filters that actively process and cancel leakage signals before they corrupt the received signal.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If interference cancellation operations are implemented to improve measurement precision, then received signal accuracy is enhanced, but device complexity increases due to additional components and calibration processes

Engineering Contradiction:

Improvereceived signal accuracyVSAvoidinterference cancellation system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The interference cancellation circuit components serve multiple functions: voltage attenuators and phase shifters perform both interference cancellation and signal conditioning, while adaptive filters provide both interference rejection and signal enhancement. The calibration process establishes lookup tables that enable rapid operation without continuous complex computation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Calibration operations are performed in advance to establish lookup tables containing optimal attenuation and phase values for various interference conditions. During normal operation, the system quickly queries these pre-computed values rather than performing complex real-time calculations, reducing operational complexity.

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If dynamic interference cancellation operations are performed continuously to maintain measurement precision, then signal accuracy is preserved, but energy consumption increases

Engineering Contradiction:

Improveradar detection accuracyVSAvoidtransceiver energy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The interference cancellation operations are performed periodically rather than continuously. The system determines when interference is present and triggers cancellation operations only at those moments, using periodic calibration updates and interference assessments to maintain precision while conserving energy during low-interference periods.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20260031850A1Systems, methods, and devices for interference cancellation in wireless devices

Publication Date: 2026.01.29 INFINEON TECHNOLOGIES AMERICAS CORP

AI summary

Systems, methods, and devices perform interference cancellation operations for wireless devices. Methods include transmitting an input signal using a transmitter of a transceiver included in a wireless device, receiving an interference signal at a receiver of the transceiver, wherein the interference signal is a leakage signal, and performing interference cancellation operations on the interference signal based, at least in part, on one or more adjustments to the receiver determined based on the input signal and the received interference signal. Methods further include generating, using the transceiver, an output signal based, at least in part, on the interference cancellation operations.