Digital Pattern Detection Using Circular Memory Accumulation
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Solution Overview
Problem
Connected objects in the Sigfox network cannot detect digital patterns in the 'Monarch' beacon signal without an OOK demodulator, which is complex and space-intensive, making it difficult for simple sensor architectures.
Innovation Solution
A method and device that use circularly addressable memory circuits to accumulate signal intensity values at the modulation frequency, allowing detection of digital patterns without an OOK demodulator by analyzing cumulative values in memory locations, using co-prime integers for pattern identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If an OOK demodulator is implemented to detect digital patterns in the Monarch beacon signal, then detection capability is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent segments the detection function into multiple independent memory circuits (J circuits), each dedicated to detecting a specific digital pattern. Each memory circuit independently accumulates signal values for its assigned pattern, eliminating the need for a complex centralized OOK demodulator while maintaining detection capability for multiple patterns simultaneously.
Solution Approach 2:
The memory circuits serve multiple functions: they act as signal accumulators, pattern matchers, and detection units simultaneously. By using the same memory circuit structure for all pattern detections, the system achieves multi-functionality without requiring separate specialized components for each detection task.
2Difficulty of detecting and measuring
If an OOK demodulator is implemented to detect digital patterns in the Monarch beacon signal, then detection capability is improved, but space requirements increase
Solution Approach 1:
The patent divides the detection space into J separate memory circuits, each handling a specific pattern. This segmentation allows parallel detection of multiple patterns within the same physical space, reducing the overall area required compared to a sequential OOK demodulation approach that would require additional processing components.
Solution Approach 2:
Instead of implementing a complex OOK demodulator, the patent creates simplified copies of detection functionality in each memory circuit. Each circuit contains a basic accumulation mechanism that copies the essential detection capability without the overhead of full demodulation hardware, significantly reducing space requirements.
3Ease of manufacture
If simple sensor architectures are used, then ease of manufacture and simplicity are improved, but detection capability deteriorates
Solution Approach 1:
The patent uses simple, manufacturable memory circuit blocks that can be easily fabricated using standard semiconductor processes. Each circuit is identical in structure, simplifying manufacturing while the collective array of these simple circuits provides sophisticated multi-pattern detection capability.
Solution Approach 2:
Each memory circuit autonomously performs its detection function by automatically accumulating signal values and comparing them against its assigned pattern without requiring external control or complex processing. This self-service capability maintains detection effectiveness while keeping individual circuit components simple and easy to manufacture.
Data Source
AI summary
In accordance with an embodiment, a device configured to detect a presence of at least one digital pattern within a signal includes J memory circuits having respectively Nj memory locations; and processing circuitry comprising an accumulator configured to successively address the memory locations of the J memory circuits in a circular manner at frequency F and during an acquisition time, and successively accumulate and store values indicative of a signal intensity in parallel in the J addressed memory locations of the J memory circuits, and a detector configured to detect the possible presence of the at least one pattern.