Space-Time Coding With Separation For Location-Specific Signal Privacy
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Solution Overview
Problem
Existing radio communication systems fail to ensure complete privacy of messages, as encryption methods can be compromised by decryption key discovery or brute-force computing, leading to potential message decoding by interceptors.
Innovation Solution
A communication system utilizing an array of signal radiating elements, such as antennas, to broadcast unique signals that spatially interfere with each other, making the message intelligible only at a predetermined location while garbling it at all other locations, employing MIMO arrays, space-time coding, and homomorphic processing to enhance security and privacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption is used to keep messages private, then message security is improved, but vulnerability to decryption key discovery and brute-force computing increases
Solution Approach 1:
The patent transitions from traditional encryption (information domain) to spatial-domain security by using phased array antenna systems. Messages are transmitted with specific spatial characteristics that allow only receivers at predetermined locations to decode them properly, adding a spatial dimension to security that is independent of cryptographic key protection
Solution Approach 2:
The system changes the fundamental parameter of message transmission from cryptographic protection to spatial-temporal signal characteristics. By manipulating phase, amplitude, and timing parameters of signals transmitted across multiple antenna elements, the system creates location-dependent message reception where only specific spatial positions can intelligibly receive the message
2Reliability
If spatial interference is used to restrict message reception to one location, then message privacy is improved, but system complexity increases
Solution Approach 1:
The phased array antenna system performs multiple functions simultaneously: it transmits the message signal, creates spatial interference patterns, and provides location-based security all through the same hardware infrastructure. The signal processing unit handles both communication and security functions, reducing the need for separate dedicated security devices
Solution Approach 2:
The patent introduces spatial interference patterns as an intermediary mechanism between the transmitter and receiver. These interference patterns act as a natural filter that automatically prevents unauthorized reception without requiring complex active monitoring or control systems at the receiver end
3Quantity of substance
If unique signals are broadcast from each radiating element, then information-carrying capacity is improved, but signal interference management becomes more difficult
Solution Approach 1:
The system uses feedback from the known transmission geometry and signal characteristics to pre-calculate and design the interference patterns. The signal processing unit incorporates knowledge of the array configuration and operating conditions to generate signals that will produce the desired spatial interference effects at the target location
Solution Approach 2:
The interference patterns are designed and established in advance as part of the message transmission process. Rather than managing interference dynamically during reception, the system pre-configures the signals from multiple radiating elements to automatically produce the required constructive and destructive interference patterns that enable location-specific message delivery
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 approach significantly increases the information-carrying capacity, robustness, and privacy of radio transmissions by ensuring that messages are only receivable at intended locations, even if encrypted and compressed, thereby protecting against unauthorized decoding.
Implementation Method 1
The unique signals, when broadcast, spatially interfere one with another such that the message is intelligibly receivable at only one location that is predetermined by the signal generating device
Data Source
AI summary
A system for transmitting a message, including an array of signal radiating elements for broadcasting signals that are unique one from another. One each of the unique signals is associated with one each of the radiating elements. One each of a set of transmitters is in electronic communication with one each of the radiating elements, and provides the associated unique signal to each of the radiating elements. A signal generating device receives the message from a message source and transforms the message into the unique signals. The unique signals, when broadcast, spatially interfere one with another such that the message is intelligibly receivable at only one location that is predetermined by the signal generating device, and is garbled at all other locations.