Distance-Dependent Random Phase Modulation for Wireless Security
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Solution Overview
Problem
Traditional anti-interception secure communication methods rely on upper-layer encryption and authentication, which are challenged by advancements in computing power and the complexity of managing secret keys, particularly with the rise of quantum computing and increased wireless accesses, where the potential security from natural factors like transmitter and receiver positions has not been fully exploited.
Innovation Solution
A physical layer encryption algorithm utilizing distance-dependent random phase modulation, where a transmitter generates a precoding signal based on the transmission delay and local random signals to ensure only a receiver at an expected distance receives the signal with a correct phase, while others receive a scrambled phase, enhancing secure communication capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If upper-layer encryption and authentication technologies are used, then secure communication can be achieved, but the system becomes vulnerable to quantum computing attacks and complex key management
Solution Approach 1:
The patent replaces the mechanical/crypto-system (upper-layer encryption and authentication) with a physical-layer solution using random phase modulation. By embedding security directly in the physical transmission channel through phase scrambling based on distance, the system eliminates complex key management while maintaining security, substituting computational security with physical-layer security.
Solution Approach 2:
The patent introduces transmission distance as an intermediary parameter for security verification. Instead of directly managing cryptographic keys, the system uses the physical distance between transmitter and receiver as a mediator to automatically verify authentication and encryption, converting key management complexity into a simple distance-based verification mechanism.
2Reliability
If distance-dependent random phase modulation is implemented, then spatial security is improved, but the system requires precise time synchronization and transmission delay measurement
Solution Approach 1:
The patent performs time synchronization as a preliminary action before implementing distance-dependent phase modulation. By pre-synchronizing the transmitter and receiver clocks and establishing a reference time relationship, the system reduces the precision requirements during actual communication, as the synchronization offset is compensated in advance rather than requiring ultra-precise real-time measurement.
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 improves the secure communication capability of wireless systems by leveraging the spatial dimension, ensuring only intended receivers decode the signal correctly while others receive scrambled phases, thereby enhancing security against interception.
Implementation Method 1
a transmitter... generates a precoding signal according to a local random signal and a transmission delay... multiplying an original signal with the precoding signal to obtain a transmitting signal
Implementation Method 2
sending the transmitting signal to the receiver... a receiver at an expected distance position can receive a signal with a correct phase
Data Source
AI summary
A random phase modulation method depending on a communication distance is provided. In the method, time synchronization is carried out by means of a transmitter and a receiver, a local random signal is generated, and an original signal to be sent is pre-coded according to a transmission delay and the generated local random signal, such that random phase modulation depending on a communication distance is realized, potential security brought about by positions of the transmitter and the receiver is fully utilized, a receiver at an expected distance position can receive a signal with a correct phase, and a receiver at another distance position receives a signal with a scrambled phase, thereby improving the secure communication capability of a wireless communication system in terms of the dimension of space.