Manchester Matched Filter for Code Violation Decoding

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Solution Overview

Problem

Existing passive keyless entry and passive keyless go systems face challenges in efficiently decoding code violations due to lower signal-to-noise performance and increased current consumption from additional hardware requirements for parallel processing paths.

Innovation Solution

The implementation of a Manchester matched filter to directly receive and decode code violations, enhancing the false acceptance rate of a correlator without the need for additional hardware, thereby improving signal-to-noise performance and reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If separate and additional matched filter(s) are added in parallel for wake up pattern and code violation processing, then both can be processed at the same time, but additional overhead and current consumption increase

Engineering Contradiction:

Improveprocessing capabilityVSAvoidcurrent consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent merges the wake up pattern matching and code violation processing into a single matched filter unit. The matched filter is configured to sequentially perform both functions: first matching the wake up pattern, then processing code violations in the same processing path, eliminating the need for parallel hardware structures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The matched filter is designed as a universal processing unit that can handle multiple functions (wake up detection and code violation processing) within a single structure. This multi-functional approach allows the same hardware to be reused for different processing tasks, reducing overall system complexity and power consumption.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If code violation symbols are decoded rather than bits, then decoding can proceed with available information, but signal to noise performance deteriorates

Engineering Contradiction:

Improvedecoding capabilityVSAvoidsignal to noise performance

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system performs preliminary wake up pattern matching before code violation processing. The matched filter first identifies and extracts the wake up pattern, then uses this preliminary detection to guide subsequent code violation decoding, ensuring that processing only begins when valid signal conditions are established.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where the output of the matched filter is fed back to adjust processing parameters. The correlation results from wake up pattern matching provide feedback that optimizes the subsequent code violation decoding process, maintaining signal-to-noise performance while enabling robust decoding.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP3185220B1Use of a biphase code matched filter to receive protocols with code violations

Publication Date: 2019.02.20 NXP BV

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AI summary

In accordance with various example embodiments, a method of receiving a protocol in the receiver, wherein the legacy protocol includes non-biphase encoded information, decoding the legacy protocol using a biphase decoder to produce a detected code, and correlating the detected code with a known code to verify the non-biphase encoded information.