Digital Signal Pre-Distortion for Secure Wireless Video Links
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Solution Overview
Problem
Existing communication systems face high processing overhead due to encryption and require complex hardware to correct signal distortion, especially in wireless high-definition video transmission, necessitating a method that does not rely on traditional encryption schemes.
Innovation Solution
The method involves pre-distorting digital data signals with a shared pre-distortion pattern to secure communication links, making it difficult for unintended receivers to demodulate the signals by intentionally altering the phase and amplitude of the modulation, thereby securing the communication without the need for traditional encryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cryptographic algorithms (AES, DES) are used to encrypt communications, then security of sensitive information is improved, but processing overhead increases significantly
Solution Approach 1:
The patent replaces traditional cryptographic encryption/decryption operations with a pre-distortion and undistortion approach. Instead of using complex cryptographic algorithms to secure the communication, the system applies intentional signal pre-distortion at the transmitter and corresponding undistortion at the receiver, substituting mechanical signal processing for cryptographic computation.
Solution Approach 2:
The patent changes the parameters of the communication signal by applying pre-distortion patterns that modify the signal characteristics. The receiver uses the corresponding undistortion pattern to restore the original signal, achieving security through parameter transformation rather than cryptographic key management.
2Measurement precision
If signal distortion correction is performed on the receiver-side before demodulation, then accurate reception of encrypted video signal is improved, but hardware complexity and cost increase
Solution Approach 1:
The patent applies pre-distortion to the signal before transmission, which is the reverse of traditional equalization. By pre-distorting the signal in a known pattern, the receiver can simply apply the inverse operation (undistortion) using a pre-stored pattern, eliminating the need for complex adaptive equalization hardware.
Solution Approach 2:
The receiver uses a stored copy of the pre-distortion pattern to perform undistortion. Instead of implementing complex distortion correction algorithms, the receiver simply applies the inverse of the known pre-distortion pattern that was applied at the transmitter, using a stored reference copy.
3Reliability
If both encryption and signal distortion correction operations are performed before demodulation, then secure and accurate communication is achieved, but processing time and computational resources increase
Solution Approach 1:
The patent merges the security function and signal correction function into a single operation. The pre-distortion serves both to secure the communication (by making the signal unintelligible without the undistortion pattern) and to enable accurate reception (by allowing simple undistortion at the receiver). This eliminates the need for separate encryption and equalization operations.
Solution Approach 2:
The patent extracts the security function from traditional cryptographic operations and integrates it with the signal processing function. By using pre-distortion as the security mechanism, the system removes the separate decryption step and combines security with the signal undistortion operation.
Data Source
AI summary
A digital data signal, such as a digital video signal, is intentionally pre-distorted before being sent over a network. In one embodiment, this pre-distortion may be performed in accordance with a pre-distortion pattern or algorithm which is shared with only intended receivers. The pre-distortion pattern may be used to vary the pre-distortion on a periodic basis, as frequently as on a symbol-by-symbol basis. The pre-distortion function may include distorting the phase and/or the amplitude of the digital signal's modulation.