Narrowband IQ Signal Obfuscation via SDR Buffering
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Solution Overview
Problem
Current communication technologies rely on preestablished patterns for frequency agile communications, making them susceptible to interception, as they require synchronized transmitters and receivers, limiting flexibility and security.
Innovation Solution
A system utilizing Software-Defined Radio technology with deep buffering and computational capabilities to transmit data in a non-time linear function, employing a wideband IQ frequency data key to obscure communications by shuffling data in time, frequency, bandwidth, and modulation, allowing for a 'low probability of intercept' without a fixed sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preestablished frequency patterns are used for communication, then synchronized transmission and reception can be achieved, but the system becomes susceptible to interception and loses flexibility
Solution Approach 1:
The patent applies dynamics by transitioning from static preestablished frequency patterns to dynamic frequency selection. The system now selects frequencies and time slots adaptively based on current conditions rather than following fixed predetermined sequences, making the communication pattern flexible and unpredictable while maintaining reliable synchronized transmission through cryptographic coordination between transmitter and receiver
Solution Approach 2:
The patent changes the parameters of frequency and time selection from fixed values to dynamically determined values. Instead of using predetermined frequency hopping patterns, the system now uses cryptographic keys to generate varying frequency and time slot assignments, transforming the communication parameters adaptively to prevent interception while ensuring reliable reception
2Adaptability or versatility
If traditional frequency agile communication is used, then data can be transmitted across multiple frequencies, but the known pattern makes interception possible
Solution Approach 1:
The patent uses cryptographic copying where the receiver generates an identical copy of the transmitter's frequency and time slot selection pattern through shared cryptographic keys. This allows the receiver to follow the same adaptive frequency agile pattern as the transmitter without needing to know the pattern in advance, ensuring accurate reception while the pattern's unpredictability prevents interception
Solution Approach 2:
The patent applies preliminary anti-action by using cryptographic keys to pre-establish secure frequency and time slot assignments before communication occurs. This preliminary cryptographic setup prevents potential interceptors from predicting or copying the communication pattern, countering the interception risk before it can materialize while maintaining frequency agility
3Adaptability or versatility
If Software-Defined Radio with deep buffering is used, then non-time linear data transmission can be achieved, but system complexity increases
Solution Approach 1:
The patent replaces traditional hardware-based frequency synthesis and signal processing with Software-Defined Radio technology. The SDR platform uses software algorithms to generate and process signals across multiple frequencies, eliminating the need for complex hardware frequency synthesizers and enabling flexible non-time linear transmission patterns through programmable logic and deep buffering capabilities
Data Source
AI summary
Narrow brand IQ signals are obfuscated by embedding the signal in a buffered portion of wideband IQ frequency data. After the data has been received and buffered, the receiving transceiver, using a wideband IQ frequency data key, of a predetermined and shared format, decodes and reconstitute the narrowband IQ signal.