Blind Authentication for Frequency Selective Fading Channels
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Solution Overview
Problem
Existing wireless communication authentication technologies, such as Auth-SS, Auth-TDM, and Auth-SUP, face challenges in frequency selective fading channels, including bandwidth requirements, security vulnerabilities, and performance degradation, especially in complex urban communication environments where interference and channel estimation errors are prevalent.
Innovation Solution
A blind authentication method and system based on a smoothing technique for frequency selective fading channels, where the authentication signal is superimposed on the pilot signal, allowing for blind known interference cancellation (BKIC) processing without affecting the signal-to-noise ratio, and using differential signal processing to determine authentication without requiring extra bandwidth or channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the authentication signal is superimposed on the information signal (Auth-SUP), then extra bandwidth is not occupied, but the signal processing difficulty increases and the signal-to-noise ratio is reduced
Solution Approach 1:
The patent introduces a pilot signal as an intermediary carrier to embed the authentication signal. Instead of directly superimposing the authentication signal on the information signal, the authentication signal is first modulated onto the pilot signal, which then serves as a mediator during transmission. This resolves the contradiction by maintaining bandwidth efficiency while simplifying the receiver's processing through dedicated pilot signal handling and channel estimation procedures.
2Measurement precision
If channel parameter estimation and symbol recovery are performed to extract the authentication signal, then authentication can be achieved, but estimation errors adversely affect the extraction process
Solution Approach 1:
The patent performs channel estimation and authentication signal extraction in a predetermined sequence before information signal processing. By estimating channel parameters and extracting the authentication signal from the pilot signal first, the system establishes a reliable foundation that reduces the impact of subsequent estimation errors on authentication accuracy. This preliminary action ensures that authentication decisions are made based on the most accurate available channel information.
3Reliability
If Auth-SS or Auth-TDM technologies are used, then authentication can be implemented, but the authentication information exposure increases and attracts hostile user attention
Solution Approach 1:
The patent merges the authentication signal with the pilot signal structure, creating a unified signal composition where the authentication information is embedded within the pilot signal rather than being a separate identifiable component. This merging makes the authentication information less conspicuous and harder for hostile users to distinguish from normal pilot signals, thereby reducing exposure while maintaining authentication functionality.
Data Source
AI summary
Disclosed is a blind authentication method for a frequency selective fading channel based on a smoothing technique. The method includes: transmitting carrier signals to a frequency selective fading channel having multiple paths, where each carrier signal includes an authentication signal, a pilot signal and an information signal, receiving the carrier signals, performing BKIC processing on a carrier signal in each path to obtain a target signal, and performing differential signal processing on the target signal to obtain a target authentication signal, obtaining a reference signal based on a key and the pilot signal in the each path, performing the differential signal processing on the reference signal to obtain a reference authentication signal, and calculating a correlation between the target authentication signal and the reference authentication signal to obtain a test statistic; and comparing the test statistic with a prescribed threshold to determine whether the carrier signal in the each of the plurality of paths can pass authentication.