Jammer-Resistant MIMO-OFDM Stack Using OSTBC and Eigen-Beamforming

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Solution Overview

Problem

Existing communication systems, particularly MIMO-OFDM systems, are susceptible to active jamming and multipath fading, which compromises communication reliability and bandwidth, especially in contested environments like battlegrounds, and lack a holistic solution for jammer resistance.

Innovation Solution

The integration of rate-2 orthogonal space-time block coding (OSTBC), precoding, and eigen-beamforming in a transceiver assembly to enhance signal-to-jammer noise ratio (SJNR) and adapt to channel conditions, combined with adaptive routing and jammer localization, provides a robust and agile communication system.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If MIMO-OFDM systems are used to enhance communication capacity and adaptability, then the system can operate in varying channel conditions and frequencies, but the system becomes susceptible to active jamming and multipath fading

Engineering Contradiction:

Improveadaptability to channel conditionsVSAvoidcommunication reliability under jamming

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary anti-action by implementing jamming detection and mitigation techniques before communication is disrupted. The system continuously monitors the communication channel for jamming signals and pre-adjusts transmission parameters (frequency hopping, power control, spatial filtering) to counteract detected jamming before it degrades communication reliability

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent implements dynamics by making the MIMO-OFDM system adaptive and reconfigurable in real-time. The system dynamically adjusts transmission parameters including frequency selection, spatial beamforming patterns, and power allocation based on channel conditions and jamming detection, allowing it to maintain reliability while preserving adaptability

Inventive Principle:

Principle #15Dynamics

2Reliability

If physical layer components are integrated to enhance communication system performance, then jamming resistance and multipath mitigation are improved, but size, weight, and power requirements increase

Engineering Contradiction:

Improvejamming resistanceVSAvoidpower requirements

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies universality by designing multi-functional signal processing components that perform multiple tasks simultaneously. For example, the spatial filtering and beamforming mechanisms not only mitigate jamming but also improve multipath fading resistance and enhance signal-to-noise ratio, reducing the need for separate dedicated components for each function

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent implements parameter changes by using software-defined radio techniques to dynamically reconfigure transmission parameters (frequency, power, modulation scheme, spatial filters) based on channel conditions. This allows the system to achieve improved jamming resistance through parameter optimization rather than adding permanent hardware components that would increase power consumption

Inventive Principle:

Principle #35Parameter changes

3Reliability

If advanced jamming mitigation techniques are implemented, then communication reliability under hostile conditions is improved, but device complexity increases

Engineering Contradiction:

Improvecommunication reliability under jammingVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the jamming mitigation function into modular components distributed across different protocol layers (physical layer for spatial filtering and frequency hopping, MAC layer for channel assessment and power control, network layer for routing decisions). This modular approach manages complexity by allowing each component to be independently optimized and maintained

Inventive Principle:

Principle #1Segmentation

4Reliability

If MIMO-OFDM systems operate in contested environments with active jammers, then communication coverage is maintained, but bandwidth and quality of experience are compromised

Engineering Contradiction:

Improvecommunication coverageVSAvoidbandwidth

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements local quality by applying spatially selective signal processing techniques. The system identifies directions of arrival for both desired signals and jamming signals, then applies targeted spatial filtering and beamforming to enhance signal quality in specific spatial directions while suppressing interference from other directions, preserving bandwidth for legitimate communications

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11115090B2Apparatus and method for jammer resistant protocol stack design

Publication Date: 2021.09.07 ANDRO COMPUTATIONAL SOLUTIONS

AI summary

An apparatus and method for providing a protocol stack design which resists active jammers. The apparatus including a transmitter component, the transmitter component including: a rate-2 orthogonal space-time block code (OSTBC) encoder for processing a set of information symbols to produce a set of encoded signals; a precoder module coupled to an output of the rate-2 OSTBC encoder for modifying a signal-to-jammer plus noise ratio (SJNR) of the set of encoded signals; and an eigen-beamformer module coupled to an output of the precoder module, and configured to generate a set of symbols for transmission via a set of eigenmodes of a channel covariance matrix for the transceiver.