RF Jamming Device with Self-Interference Cancellation

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Solution Overview

Problem

Current radio frequency communication systems for medical applications rely on cryptographic algorithms and lack physical secrecy, especially in bidirectional links and scenarios with multiple hostile eavesdroppers, and existing jamming methods are limited in coverage and effectiveness.

Innovation Solution

A radio frequency communication and jamming device with an antenna arrangement, receiver, jamming generator, and self-interference cancellation device that transmits jamming signals to disrupt hostile communications while allowing physically secured communication between friendly devices, using self-interference cancellation to extract information signals from jammed frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If cryptographic algorithms are used for securing communication, then communication security is provided, but physical secrecy is not achieved and vulnerability to multiple hostile eavesdroppers remains

Engineering Contradiction:

Improvecommunication securityVSAvoidphysical secrecy capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The system segments the communication environment by identifying friendly versus hostile devices and applying different signal treatments. Friendly devices receive cancelled jamming signals while hostile devices are subjected to uninterrupted jamming, creating segmented security zones based on device authentication status

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The self-interference cancellation device acts as an intermediary that selectively removes jamming signals from friendly receivers while leaving hostile receivers affected. This intermediary mechanism enables physical secrecy by mediating between the jamming source and different receiver types

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If jamming signals are transmitted to disrupt hostile communications, then hostile communication is blocked, but friendly communication is also interfered with due to self-interference

Engineering Contradiction:

Improvehostile communication disruptionVSAvoidself-interference to friendly communication

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The system converts the harmful self-interference caused by jamming signals into a beneficial selective cancellation mechanism. The jamming signal that would normally interfere with friendly communication is instead used as a reference to generate cancellation signals, turning the harmful interference into a tool for protecting friendly communication

Inventive Principle:

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

Solution Approach 2:

The self-interference cancellation device uses feedback from the transmitted jamming signals to generate and apply cancellation signals. The system continuously monitors its own jamming output and adjusts the cancellation signals accordingly, creating a closed-loop feedback mechanism that eliminates self-interference

Inventive Principle:

Principle #23Feedback

3Reliability

If a centralized jamming source is used with multi-antenna configuration, then physical secrecy is introduced to unidirectional links, but jamming coverage is limited to a sub-space and physical secrecy is affected by relative location

Engineering Contradiction:

Improvephysical secrecyVSAvoidjamming coverage area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

Each device in the system is configured to perform multiple functions: transmitting information signals, generating jamming signals, and receiving signals while performing self-interference cancellation. This multi-functionality enables distributed jamming coverage across the entire communication area rather than limiting jamming to a sub-space

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system segments the jamming function across multiple distributed devices rather than using a single centralized source. Each device independently generates and transmits jamming signals, creating overlapping coverage zones that collectively secure the entire communication area against hostile eavesdroppers

Inventive Principle:

Principle #1Segmentation

4Reliability

If time-division two-hop protocol with jamming is used, then physical secrecy is maintained, but transmission is discontinuous due to division into two consecutive time slots

Engineering Contradiction:

Improvephysical secrecyVSAvoidtransmission continuity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system enables continuous transmission by allowing devices to simultaneously transmit information signals and generate jamming signals in the same time slot. The self-interference cancellation mechanism ensures that the jamming signal does not interfere with friendly reception, eliminating the need for time-division and maintaining continuous useful transmission action

Inventive Principle:

Principle #20Continuity of useful 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 provides secure, bidirectional wireless links among friendly devices while jamming hostile communications, enhancing physical security and allowing eavesdropping on hostile signals, with improved coverage and effectiveness compared to existing methods.

Implementation Method 1

a self-interference cancellation device configured for cancelling portions of the at least one jamming signal in the incoming signals received via the receiving section at least in the receiving frequency band

Methodology Applied

Scientific EffectSelf-interference cancellation:

Implementation Method 2

a jamming generator configured for generating at least one jamming signal for jamming at least one jamming frequency band, wherein the jamming signal is transmitted as one of the outgoing signals via the transmission section

Methodology Applied

Scientific EffectElectromagnetic radiation:

Data Source

PatentUS11677490B2Radio frequency communication and jamming device and method for physically secured friendly radio frequency communication and for jamming hostile radio frequency communication

Publication Date: 2023.06.13 FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV

AI summary

Disclosed is a radio frequency communication and jamming device configured for physically secured friendly radio frequency communication and for jamming hostile radio frequency communication, the radio frequency communication and jamming device including: an antenna arrangement having a transmission section for transmitting outgoing signals and a receiving section for receiving incoming signals; a receiver device configured for extracting an incoming information signal from the incoming signals received via the receiving section of the antenna arrangement in a receiving frequency band; a jamming generator configured for generating at least one jamming signal for jamming at least one jamming frequency band, wherein the jamming signal is transmitted as one of the outgoing signals via the transmission section, wherein the at least one jamming frequency band includes the receiving frequency band; and a self-interference cancellation device configured for cancelling portions of the at least one jamming signal in the incoming signals received via the receiving section at least in the receiving frequency band.