PHY-Level Wireless Security via Orthogonal Beamforming

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Solution Overview

Problem

Existing wireless communication systems face challenges in securing transmissions from illegitimate eavesdropping, as current methods may not effectively degrade the signal at eavesdroppers without degrading the signal at legitimate receivers, and often require assumptions about the eavesdropper's location or properties.

Innovation Solution

The method involves generating a data transmission and a jamming transmission with varying amplitude, using an antenna array to transmit both signals, where the jamming transmission is beamformed to be orthogonal to the legitimate receiver's channel and exceeds the eavesdropper's tracking rate, ensuring the eavesdropper cannot decode the data while causing minimal degradation to the legitimate receiver.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If jamming transmission is applied to prevent eavesdropping, then security against eavesdropping is improved, but signal quality at legitimate receiver may be degraded

Engineering Contradiction:

Improvesecurity against eavesdroppingVSAvoidsignal quality at legitimate receiver

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies different signal characteristics to different spatial locations by beamforming the jamming transmission orthogonally to the legitimate receiver's channel. This creates localized signal quality: high quality for the legitimate receiver in its specific direction, and degraded quality for eavesdroppers in other directions, thereby resolving the contradiction between security and signal quality.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces spatial dimension through antenna arrays and beamforming to differentiate between legitimate and eavesdropping receivers. By operating in the spatial domain rather than just time or frequency domains, the system can simultaneously maintain high signal quality for legitimate users while degrading signals for eavesdroppers, resolving the security-quality contradiction.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If jamming transmission with high amplitude variation is used to exceed eavesdropper tracking rate, then eavesdropping prevention is improved, but system complexity increases

Engineering Contradiction:

Improveeavesdropping preventionVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs dynamic amplitude variation in the jamming transmission, where the amplitude changes multiple times during the data transmission at a rate exceeding the eavesdropper's tracking capability. This dynamic approach enhances eavesdropping prevention while using controlled complexity through systematic amplitude modulation patterns.

Inventive Principle:

Principle #15Dynamics

3Reliability

If beamforming is applied to direct jamming signal orthogonal to legitimate receiver channel, then security is improved, but calculation and implementation complexity increases

Engineering Contradiction:

ImprovesecurityVSAvoidbeamforming configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent performs preliminary channel estimation and beamforming configuration before the actual data transmission. By pre-calculating the orthogonal beamforming vectors based on channel state information, the system reduces real-time computational complexity while maintaining security effectiveness through pre-optimized jamming signal directions.

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

This approach enhances physical-layer security by preventing eavesdropping while maintaining the quality of the data transmission to legitimate receivers, without requiring specific knowledge of the eavesdropper's location or properties, and reduces communication overhead.

Implementation Method 1

The data transmission is transmitted to the target receiver using an antenna array, and the at least one jamming transmission is simultaneously transmitted using the antenna array

Methodology Applied

Scientific EffectBeamforming:

Implementation Method 2

generating the jamming transmission includes beamforming the jamming transmission using a beamforming vector that is orthogonal to a reception channel of the target receiver

Methodology Applied

Scientific EffectOrthogonal beamforming:

Implementation Method 3

setting an amplitude variation of the jamming transmission to exceed an expected dynamic range of an eavesdropping receiver

Methodology Applied

Scientific EffectDynamic range limitation:

Implementation Method 4

setting a rate at which the amplitude of the jamming transmission changes, so as to exceed an expected tracking rate of an eavesdropping receiver

Methodology Applied

Scientific EffectTracking rate limitation:

Data Source

PatentUS9686038B2PHY-level wireless security

Publication Date: 2017.06.20 CELENO COMMUNICATIONS (ISRAEL) LTD

AI summary

A method for communication includes generating a data transmission for transmission to a target receiver, and generating at least one jamming transmission having an amplitude that changes multiple times during the data transmission. The data transmission is transmitted to the target receiver using an antenna array, and the at least one jamming transmission is simultaneously transmitted using the antenna array.