Reactive Jamming SDR with FPGA IP Core for Energy-Efficient FHSS Defense

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Solution Overview

Problem

Current software-defined radio (SDR) platforms face challenges in achieving high-performance and real-time reactive jamming operations due to latency constraints and detection requirements, particularly in defending against frequency-hopping spread-spectrum signals like Bluetooth, which are energy-efficient and difficult to detect.

Innovation Solution

A reactive jamming SDR apparatus with a peripheral module for SDR processing and a custom hardware IP core on a field-programmable gate array (FPGA) for time-sensitive operations, combined with host computer tasks for non-time-critical functions, enables efficient detection and jamming of frequency-hopping spread-spectrum signals by using a hierarchical, multi-stage energy-based detection method and reconfigurable waveform parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If continuous inband jamming signals are used to disable communication, then the network becomes unavailable to legitimate users, but high power requirement and high probability of detection occur

Engineering Contradiction:

Improvenetwork availabilityVSAvoidpower requirement

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements reactive jamming that operates periodically only when packets are detected in the air, rather than continuous transmission. The jammer senses the wireless medium, detects incoming packets, and transmits jamming signals only during these detection events, thereby reducing overall power consumption while maintaining network disruption effectiveness

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system employs feedback mechanisms by continuously sensing the wireless medium and detecting packets before jamming. This feedback loop allows the jammer to adapt its transmission based on real-time detection of legitimate communications, enabling energy-efficient operation by activating jamming only when necessary

Inventive Principle:

Principle #23Feedback

2Reliability

If continuous inband jamming signals are used to disable communication, then the network becomes unavailable to legitimate users, but high probability of detection occurs

Engineering Contradiction:

Improvenetwork availabilityVSAvoiddetection probability

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

By transmitting jamming signals periodically only when packets are detected rather than continuously, the system reduces the overall visibility and detectability of the jamming operation. The intermittent nature of transmission makes it harder for detection systems to identify and characterize the jammer

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The feedback-based detection and reaction mechanism allows the jammer to operate stealthily by activating only when legitimate traffic is present, blending into the background noise and avoiding constant detection that would occur with continuous transmission

Inventive Principle:

Principle #23Feedback

3Use of energy by moving object

If reactive jamming is used to jam packets in the air with little energy, then energy efficiency is improved, but implementation challenges arise in meeting strict real-time constraints

Engineering Contradiction:

Improveenergy efficiencyVSAvoidreal-time response speed

Core Design Contradiction:

Use of energy by moving objectVSSpeed

Solution Approach 1:

The patent segments the processing architecture into distinct functional blocks: sensing module for detecting packets, decision module for determining when to jam, and transmission module for sending jamming signals. This segmentation allows each module to be optimized independently for its specific real-time requirement, improving overall response speed

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system introduces an intermediary detection and decision mechanism that bridges the gap between packet detection and jamming transmission. This intermediary layer processes detection events and triggers jamming responses with precise timing control, enabling the system to meet strict real-time constraints while maintaining energy efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

4Adaptability or versatility

If host side signal processing is used for reactive jamming, then flexibility is improved, but latency constraints prevent meeting real-time requirements

Engineering Contradiction:

Improveprocessing flexibilityVSAvoidlatency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent replaces the mechanical/software-based host side signal processing with a hardware-based Field Programmable Gate Array (FPGA) implementation. This substitution of processing architecture eliminates software latency and provides deterministic real-time performance while maintaining the flexibility of software-defined radio through reconfigurable logic

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS10985861B2Energy-efficient reactive jamming of frequency-hopping spread spectrum (FHSS) signals using software-defined radios

Publication Date: 2021.04.20 DREXEL UNIV

AI summary

A reactive jamming software defined radio (SDR) apparatus to target Frequency Hopping Spread-Spectrum (FHSS) signals includes a peripheral module for SDR processing; a reactive jamming hardware IP core that implements time-sensitive operations on a field programmable gate array (FGPA); and a host computer that implements non-time-critical operations, such as jammer configuration, logging, and strategy composition.