Blind Jamming Mitigation Receiver for Multi-Jammer Wireless Networks
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Solution Overview
Problem
Existing anti-jamming solutions in wireless networks, particularly those using MIMO techniques, rely on accurate jamming channel information which is difficult to estimate in real-world systems, making them impractical for multi-jammer environments and unable to effectively handle powerful broadband jamming attacks.
Innovation Solution
A blind jamming mitigation (BJM) algorithm and jamming-resistant receiver (JrRx) device that computes and applies filters to decode signals without channel information, using linear spatial filters and pilot signals to mitigate jamming signals from multiple unknown jammers, enabling successful communication even when jamming signals are 20 dB stronger than desired signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MIMO-based anti-jamming solutions are used, then spatial jamming mitigation capability is improved, but the requirement for accurate jamming channel information increases, making the system impractical for real-world multi-jammer environments
Solution Approach 1:
The patent extracts and removes the requirement for jamming channel information from the anti-jamming process. By formulating the received signal model and designing filters that operate without needing to estimate jamming channel characteristics, the solution eliminates the complex channel estimation step that made previous MIMO-based approaches impractical for real-world multi-jammer environments.
Solution Approach 2:
The patent enables the receiver to serve itself by autonomously computing optimal filters using only the received signal statistics and desired signal knowledge. The system self-adjusts to jamming conditions without external assistance or complex channel estimation, allowing practical implementation in dynamic multi-jammer environments where jamming characteristics are unknown and constantly changing.
2Object-affected harmful factors
If traditional anti-jamming approaches (FHSS, DSSS) are used, then spectrum spreading is achieved, but spectrum utilization efficiency deteriorates and they cannot address powerful broadband jamming attacks
Solution Approach 1:
The patent changes the fundamental parameter of jamming counteraction from spectrum spreading (FHSS, DSSS) to spatial filtering. Instead of spreading signals across frequency to resist jamming, the system uses MIMO spatial processing with carefully designed filters that selectively pass desired signals while rejecting jamming, achieving both protection and efficient spectrum utilization.
Solution Approach 2:
The patent transitions from one-dimensional frequency-domain spreading to three-dimensional spatial-frequency processing. By utilizing multiple antennas and designing filters in the spatial domain, the system achieves jamming resistance without sacrificing spectrum efficiency, effectively adding spatial dimensionality to the communication system.
3Reliability
If existing MIMO-based anti-jamming solutions are implemented, then interference cancellation capability is improved, but the dependence on accurate jamming channel information makes them inapplicable to practical real-world systems
Solution Approach 1:
The patent segments the anti-jamming function into two independent parts: (1) desired signal channel estimation using pilot symbols, and (2) jamming rejection through filter design that does not require jamming channel information. This segmentation allows the system to achieve interference cancellation while maintaining practical implementability in real-world systems.
Solution Approach 2:
The patent performs preliminary estimation of the desired signal channel characteristics using known pilot symbols before the actual data transmission. This preliminary action enables the receiver to prepare the necessary filter coefficients in advance, eliminating the need for real-time jamming channel estimation and making the system practically implementable.
Data Source
AI summary
A method for utilizing a jamming-resistant receiver (JrRx) device includes receiving, by a BJM engine, a plurality of individual subcarrier signals that comprises separate signal portions of a combined signal stream, wherein the combined signal stream is a combination formed by a source signal stream from a sender device and one or more interfering jamming signals from a plurality of unknown jammer devices and computing, by the BJM engine, a respective plurality of BJM filters for the plurality of individual subcarrier signals in the absence of channel information corresponding to the interfering jamming signals. The method further includes applying, by the BJM engine, the plurality of BJM filters to the respective plurality of individual subcarrier signals to decode data packets of the plurality of individual subcarrier signals in order to produce a plurality of source signal stream portions as decoded output, and recovering, by the BJM engine, the source signal stream by combining the decoded output from each of the plurality of BJM filters.