RF Processing Module Secure Training Sequence Angle of Arrival
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Solution Overview
Problem
Current RF communication systems, particularly in IR-UWB, face vulnerabilities such as preamble injection attacks and Early Detect, Late Commit (EDLC) attacks, which compromise distance measurement security and link budget, and lack flexibility in channel length adjustment and error correction, leading to inefficiencies in automotive Passive Keyless Entry (PKE) and contactless payment systems.
Innovation Solution
A processing module for RF communication devices that employs a secure training sequence with a non-repeating pattern of symbols, using cross-correlation to determine the phase and angle of arrival of signals, and convolutional encoding for secure data transmission, enabling secure channel estimation and improved error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeating synchronization symbols are used for channel estimation, then time and frequency synchronization can be achieved, but the system becomes vulnerable to preamble injection attacks and EDLC attacks
Solution Approach 1:
The patent extracts the synchronization function from the training sequence by using only repeating synchronization symbols for time and frequency synchronization, while deriving channel estimation from other parts of the signal that are not vulnerable to preamble injection attacks. This separation allows synchronization to remain reliable while eliminating the security vulnerability.
Solution Approach 2:
The patent introduces an intermediary approach where synchronization symbols serve solely for time and frequency synchronization, while channel estimation is obtained through alternative methods that do not rely on the same vulnerable training sequence. This intermediary separation of functions protects against attacks that target the training sequence.
2Device complexity
If a fixed training sequence structure is used, then implementation is simplified, but flexibility in channel length adjustment and error correction is limited
Solution Approach 1:
The patent implements dynamic adaptability by allowing the training sequence structure to be configured based on channel conditions and requirements. The system can adjust channel length parameters and error correction mechanisms dynamically, moving away from fixed structures to provide both flexibility and manageable complexity through standardized adaptation procedures.
Solution Approach 2:
The patent enables parameter changes in the training sequence structure, allowing adjustment of channel length, symbol rates, and error correction codes based on specific application requirements. This parameter flexibility maintains implementation simplicity through standardized modification procedures while adapting to diverse communication scenarios.
3Device complexity
If conventional channel estimation methods are used, then processing is simpler, but security against distance bounding attacks is compromised
Solution Approach 1:
The patent applies preliminary action by establishing secure synchronization and channel estimation procedures before actual distance measurement takes place. The repeating synchronization symbols are processed first to establish a secure reference frame, and channel estimation is derived subsequently using methods that prevent distance bounding attacks, ensuring security is built into the measurement process from the outset.
Solution Approach 2:
The patent converts the potential harm of using repeating symbols (which could enable attacks) into a benefit by utilizing them exclusively for synchronization purposes while deriving secure channel estimation from other signal components. This transformation allows the repeating structure to provide synchronization reliability without creating security vulnerabilities.
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
Enhances the security and accuracy of distance measurements, improves link budget, and reduces power consumption and system cost by mitigating attack vulnerabilities and optimizing channel estimation and error correction in RF communication systems.
Implementation Method 1
perform cross correlation between the first block from the first antenna and a first part of the derived secure training sequence to obtain a first phase marker defining a phase of the signal from the first antenna relative to the determined phase of the carrier wave
Implementation Method 2
based on the first phase marker and the second phase marker defining a phase difference of the signal between the first and second antennas and a known spacing of the first antenna relative to the second antenna, determine an angle of arrival of the signal relative to the receiver device
Implementation Method 3
based on a plurality of repeating, predetermined synchronization symbols of the signal, provide for determination of a phase of a carrier wave of the signal received at the first antenna of the receiver device or transmitted from a first antenna of the transmitter device
Data Source
AI summary
A processing module for a receiver device is disclosed. The processing module is configured to provide for processing of a signal received by the receiver device from a transmitter device. The signal includes a secure training sequence divided into a plurality of time spaced blocks. The secure training sequence incoudes a non-repeating pattern of symbols. The processing module is configured to, based on a first phase marker in the first block and a second phase marker in the second block defining a phase difference of the signal between the first and second antennas and a known spacing of the first antenna relative to the second antenna, determine an angle of arrival of the signal relative to the receiver device.