Phase Domain Modulation for Spatial Security
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Solution Overview
Problem
Traditional anti-interception and anti-deception methods relying on upper-layer encryption face challenges due to high computing overhead and eavesdropping threats, while physical-layer secure communication technologies struggle with channel reciprocity, providing limited security when the eavesdropper and legitimate receiver share the same direction angle.
Innovation Solution
A phase domain modulation method dependent on spatial position, utilizing time-domain, frequency-domain, space-domain, and code-domain resources for secure communication, where a transmitter performs phase domain precoding and matching operations to ensure only legitimate receivers at specific distances can decode the signal, overcoming channel state information dependence and enhancing security in the distance domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If upper-layer encryption and authentication technologies are used, then security is provided, but computing overhead increases and resources are wasted
Solution Approach 1:
The patent replaces upper-layer encryption and authentication mechanisms with physical-layer security mechanisms. Specifically, it uses phase domain modulation dependent on spatial position to embed security directly in the signal transmission process, eliminating the need for complex computational encryption and authentication protocols while maintaining security.
Solution Approach 2:
The patent changes the security implementation from computational parameters (encryption keys, authentication credentials) to physical parameters (phase domain characteristics, spatial position, transmission delay). This allows security to be determined by physical channel properties rather than computational complexity, reducing resource consumption.
2Adaptability or versatility
If spatial beamforming and direction modulation are used, then channel reciprocity limitation is overcome, but only angle domain security is provided
Solution Approach 1:
The patent extends security from the angle domain to the distance domain by introducing a new dimension of spatial differentiation. It uses transmission delay Δτ and phase domain characteristics that vary with distance, creating a two-dimensional security space (angle × distance) rather than relying solely on angle-based security.
Solution Approach 2:
The patent combines multiple domain resources (time-domain, frequency-domain, space-domain, code-domain) to create a composite security mechanism. This multi-domain approach integrates spatial beamforming's angle domain security with phase domain modulation's distance domain security, providing comprehensive spatial security coverage.
3Reliability
If phase domain precoding is performed using multiple channel resources, then security in distance domain is achieved, but system complexity increases
Solution Approach 1:
The patent makes the phase domain precoding system multi-functional by using the same precoding framework to simultaneously achieve distance domain security, power efficiency maintenance, and compatibility with existing channel resources. The unified precoding approach handles multiple security requirements without requiring separate dedicated systems for each function.
Solution Approach 2:
The patent introduces dynamic adaptability in the phase domain precoding process, where precoding parameters (phase shifts, amplitude weights) are dynamically adjusted based on spatial position and transmission delay. This dynamic characterization allows the system to adapt to different receiver positions and channel conditions, achieving security without rigid complex structures.
Data Source
AI summary
A phase domain modulation method dependent on a spatial position is provided. The method mainly includes the following steps: a transmitter and a receiver perform time synchronization to obtain a synchronization time; the transmitter performs a phase domain precoding operation on an original signal to obtain a phase domain pre-coded signal; the receiver receives the phase domain pre-coded signal, obtains a phase domain initial reception signal, and performs a phase domain matching operation on the phase domain initial reception signal to obtain an estimation of the original signal.