Wideband Full-Duplex Radio Using Self-Interference Cancellation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing communication devices are limited by the need to divide frequency bands for transmission and reception, leading to inefficiencies in bandwidth usage, especially with the increasing demand for wireless communication and data transmission, and STAR devices, capable of simultaneous transmit and receive operations, have found limited commercial use due to their narrowband nature and lack of protocols for integration into modern networks.

Innovation Solution

Implementing STAR devices with interference suppressors and processing circuitry to enable simultaneous transmission and reception at the same frequency, using interference-suppressed bands and sub-bands to reduce noise, and employing a protocol for initiating communication between devices, including polling, interrogation, and authentication signals to manage network interactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If frequency bands are divided into separate transmission and receiving bands, then interference between transmit and receive signals is reduced, but bandwidth efficiency deteriorates

Engineering Contradiction:

Improvesignal interference reductionVSAvoidbandwidth efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges the transmit and receive frequency bands into a single overlapping band, allowing simultaneous transmission and reception on the same frequency. This is achieved through self-interference cancellation techniques that subtract the known transmit signal from the received signal, enabling full-duplex operation and improving bandwidth efficiency while maintaining reliable communication

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent converts the harmful self-interference effect into a beneficial cancellation opportunity. By knowing the exact transmit signal waveform and using it to subtract from the received signal, the system transforms the interfering transmit signal into a reference that enables interference cancellation, allowing simultaneous transmit and receive operations

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Productivity

If STAR devices operate at the same frequency for simultaneous transmit and receive, then bandwidth efficiency is improved, but self-interference increases

Engineering Contradiction:

Improvebandwidth efficiencyVSAvoidself-interference

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent implements feedback mechanisms where the transmit signal is fed back to the receiver path and used to calculate and subtract the self-interference component. This feedback loop enables real-time cancellation of the transmit signal from the received signal, maintaining low interference levels while operating in full-duplex mode

Inventive Principle:

Principle #23Feedback

3Device complexity

If narrowband STAR devices are used for specialized purposes, then device complexity is reduced, but versatility deteriorates

Engineering Contradiction:

Improvedevice simplicityVSAvoidapplication scope

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent implements universal protocols and signal processing algorithms that can be applied across different frequency bands and application scenarios. The self-interference cancellation technique and full-duplex operation framework are designed to be band-agnostic and can be adapted to various communication standards and specialized applications, making the device versatile while maintaining manageable complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12549323B1Permitting wideband simultaneous transmit and receive communications on overlapping frequency bands

Publication Date: 2026.02.10 RESONANT SCIENCES LLC

AI summary

Wideband simultaneous transmit and receive communications on overlapping frequency bands may be achieved by communicating via a communication device having a transmit signal path and a receive signal path. The transmit signal path and receive signal path are operable to transmit and receive simultaneously at the same frequency. A first remote communication device communicates over a first interference suppressed band using a first channel in the transmit signal path and receive signal path. A second remote communication device communicates over a second interference suppressed band using a second channel in the transmit signal path and receive signal path.