CP-DSSS Signal Authentication via Artificial Noise Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication technologies face challenges in distinguishing between legitimate and spoofing devices in spread spectrum signals, particularly in ensuring secure and authentic communication within crowded wireless networks.
Innovation Solution
The implementation of a cyclic prefix-direct sequence spread spectrum (CP-DSSS) signal with added artificial noise, allowing for authentication based on signal properties such as matched filter signal levels, to differentiate between legitimate and spoofing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DSSS signals are used for wireless communication, then multiple users can share the same channel and signal interference is reduced, but it becomes difficult to distinguish between legitimate devices and spoofing devices
Solution Approach 1:
The patent applies preliminary action by adding a cyclic prefix to the DSSS signal before transmission. This cyclic prefix contains authentication information that is processed in advance to create a unique signal signature. The receiver then processes this pre-added prefix to verify the signal's authenticity, enabling reliable device identification while maintaining channel sharing capabilities.
Solution Approach 2:
The cyclic prefix acts as an intermediary element between the DSSS signal and the authentication process. It introduces additional signal components that carry authentication information without interfering with the primary communication function. This intermediary structure allows the system to distinguish legitimate devices from spoofing devices while preserving the original signal's channel sharing properties.
2Reliability
If a cyclic prefix is added to DSSS signals to enable authentication, then device distinction capability is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the signal into distinct components: the original DSSS signal and the added cyclic prefix. This segmentation allows the authentication mechanism to operate on a separate, dedicated portion of the signal without affecting the primary communication data. The receiver processes the cyclic prefix independently to verify authenticity, then processes the main signal for communication, thereby managing complexity through functional separation.
3Reliability
If artificial noise is added to CP-DSSS signals, then security against spoofing is enhanced, but signal-to-noise ratio decreases
Solution Approach 1:
The patent applies local quality by adding artificial noise selectively to specific portions of the signal or using noise with specific statistical properties that differ from the main signal. The cyclic prefix structure allows the receiver to focus detection on specific signal regions where the noise pattern is predictable, enabling the system to distinguish legitimate signals from noisy spoofing attempts while maintaining detection accuracy through localized signal characteristics.
Data Source
AI summary
Various embodiments relate to spread spectrum communication. A communication system may include a base station and a user equipment. The base station may be configured to: add a cyclic prefix (CP) to each block of a number of blocks of a first direct sequence spread spectrum (DSSS) signal to generate a first cyclic prefix-direct sequence spread spectrum (CP-DSSS) signal; add artificial noise to the first CP-DSSS signal; and transmit, via a channel, the first CP-DSSS signal. The user equipment is configured to receive the first CP-DSSS signal. Associated methods and communications systems are also disclosed.