OAM Mode Quadratic Coordination for Wireless Anti-Jamming
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Solution Overview
Problem
Existing anti-jamming methods for wireless communications using vortex electromagnetic waves face limitations in confidentiality rate and anti-jamming capability due to intra-mode crosstalk from plane wave jamming.
Innovation Solution
A method employing OAM mode quadratic coordination, where the transmitter selects primary and secondary OAM modes, generates a mode quadratic collaborative transformation sequence, and loads these modes onto an antenna to transmit signals, while the receiver performs inverse transformation and jamming elimination to estimate the signal vector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional frequency hopping techniques are used, then anti-jamming performance is improved, but spectrum resources are limited and anti-jamming capability cannot be significantly enhanced
Solution Approach 1:
The patent extends the traditional one-dimensional frequency hopping to a two-dimensional OAM mode-frequency hopping domain. By introducing OAM modes as an additional dimension for signal transmission, the system can achieve diverse signal carriers without consuming additional spectrum resources, thereby resolving the contradiction between anti-jamming performance and spectrum resource limitations.
Solution Approach 2:
The patent changes the transmission parameter from traditional frequency-only hopping to combined OAM mode and frequency hopping. By utilizing the orthogonal properties of different OAM modes, the system creates new signal diversity in the mode domain, enabling enhanced anti-jamming capability while maintaining efficient spectrum utilization.
2Productivity
If all OAM modes are used for information transmission, then transmission capacity is improved, but confidentiality rate is limited and anti-jamming capability is insufficient
Solution Approach 1:
The patent segments the OAM modes into different functional groups: some modes carry information transmission while other modes are dedicated to anti-jamming operations. This segmentation allows the system to simultaneously achieve high transmission capacity through information-carrying modes and strong anti-jamming capability through dedicated anti-jamming modes, resolving the contradiction between transmission capacity and anti-jamming capability.
3Reliability
If mode hopping of vortex electromagnetic waves is used, then anti-jamming capability is improved, but intra-mode crosstalk from plane wave jamming reduces resistance to strong jamming
Solution Approach 1:
The patent extracts and eliminates the harmful intra-mode crosstalk component from the received signal through dedicated signal processing operations. By separating the desired signal from the crosstalk interference and applying appropriate filtering and reconstruction techniques, the system removes the harmful effects of plane wave jamming while preserving the anti-jamming capability provided by mode hopping.
4Productivity
If index modulation is used for vortex electromagnetic waves, then spectrum efficiency is improved, but anti-jamming performance is limited without strong synchronization and key sharing
Solution Approach 1:
The patent merges index modulation with OAM mode hopping to create a unified transmission scheme. By combining the spectrum efficiency benefits of index modulation with the anti-jamming capabilities of mode hopping, and integrating them through a coordinated transmission and reception process with synchronization and key sharing mechanisms, the system achieves both high spectrum efficiency and strong anti-jamming performance simultaneously.
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 method significantly enhances spectrum efficiency and anti-jamming performance by utilizing orthogonal OAM modes to suppress jamming and adaptively return co-channel jamming to zero, achieving deep physical-layer protection.
Implementation Method 1
selecting at each hop, via the transmitter, primary OAM modes and secondary OAM modes from N mutually orthogonal OAM modes being generated simultaneously
Implementation Method 2
Electromagnetic waves carrying OAM are called as vortex electromagnetic waves. The 'Utilization of Photon Orbital Angular Momentum in the Low-Frequency Radio Domain' has introduced the OAM to a microwave band and verified that vortex electromagnetic waves can be generated by phased array antennas
Implementation Method 3
uses the Fourier transform to recover the information
Data Source
AI summary
A method for eliminating jamming by OAM mode quadratic coordination is disclosed, including: a transmitter selecting a primary OAM mode and secondary OAM modes; based on a group of keys and real-time time self-defined by the transmitter and the receiver respectively, generating via the transmitter, a mode quadratic collaborative transformation sequence, and based on a mode quadratic collaborative transformation sequence, dividing input binary information bits into OAM mode index information bits and signal modulation bits, and jointly designing a position distribution of their bits in an information frame structure; determining via the transmitter, G quadratic collaborative transformation OAM modes carrying constellation point symbols activated at each hop, loading them onto each array element of an antenna to obtain G mutually orthogonal OAM mode quadratic collaborative transformation signals y, transmitting the G mutually orthogonal OAM mode quadratic collaborative transformation signals y to the receiver.