Full-Duplex Radar Correlation for Low-Interference Wireless Sensing

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Solution Overview

Problem

Existing wireless communication devices face challenges in integrating radar functionality without degrading communication quality, as conventional radar operations interfere with communication signals and require significant design complexity and resource coordination.

Innovation Solution

A wireless communication device configured to transmit radar signals at extremely low power spectral density, using a new correlator structure for discontinuous correlation of multiple short radar bursts interspersed with communication signals, enabling long correlation times and target detection range extension.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If radar signals are transmitted at high power, then detection range is improved, but communication signal quality deteriorates due to interference and receiver saturation

Engineering Contradiction:

Improvedetection rangeVSAvoidcommunication signal interference

Core Design Contradiction:

Length of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent implements periodic radar signal transmission using discontinuous bursts interspersed with communication signals. The correlator is activated only during radar burst periods and remains inactive during communication periods, creating a periodic operation pattern that allows both radar and communication to coexist without mutual interference

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent segments the correlation process into multiple discontinuous time periods corresponding to individual radar bursts. Each burst is correlated separately, and the partial correlation results are accumulated to achieve the desired detection range without requiring continuous high-power transmission

Inventive Principle:

Principle #1Segmentation

2Device complexity

If radar and communication share the same RF transceiver, then device complexity is reduced, but signal saturation occurs preventing simultaneous operation

Engineering Contradiction:

Improvenumber of componentsVSAvoidsimultaneous operation capability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent employs periodic switching between radar and communication modes using the same RF transceiver. The correlator is activated during radar bursts and deactivated during communication periods, enabling reliable time-division multiplexing that prevents signal saturation while maintaining hardware simplicity

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent makes the RF transceiver universal by enabling it to perform both radar and communication functions using the same hardware components. The correlator is configured to selectively process radar signals during specific time periods while allowing communication signals to pass through unprocessed during other periods

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If low power radar signals are used, then communication interference is minimized, but detection range and target size capability are limited

Engineering Contradiction:

Improvecommunication signal degradationVSAvoidtarget size resolution

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The patent extends the useful correlation action across multiple discontinuous radar bursts by accumulating partial correlation results. This continuous accumulation process maintains low transmit power throughout while achieving the integration time necessary for detecting small targets and extending detection range

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The patent performs preliminary correlation on each individual radar burst to generate partial results, which are then accumulated. This preliminary processing of each burst enables the system to maintain low power levels while building up the detection capability through progressive accumulation

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution allows simultaneous operation of radar and communication without saturation, achieving increased detection range and target size resolution while maintaining low interference with communication signals.

Implementation Method 1

correlating each of two or more parts of the radar signal received in different ones of the discontinuous time periods with a reference signal to obtain partial correlation results

Methodology Applied

Scientific EffectCorrelation:

Implementation Method 2

transmit radar signals at extremely low power spectral density so that the receiver can be operated at the same time without saturating

Methodology Applied

Scientific EffectElectromagnetic radiation:

Data Source

PatentUS20250355110A1Radar Detection in a Wireless Communication Device with Full-Duplex Below Noise Radar

Publication Date: 2025.11.20 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A wireless communication device is configured to transmit radar signals at extremely low spectral density so that the receiver can be operated at the same time without saturating and thereby enabling full-duplex operation. To extend the capabilities of radar operation, a new correlator structure is proposed for detection of radar signals using discontinuous correlation of multiple short radar bursts that are temporally separated by communication signals. Discontinuous correlation as herein described enables long correlation times so that the detection range and target velocities can be increased, and target size can be reduced, compared to prior art.