Frequency Hopping Offset Orthogonalization for Security Systems
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Solution Overview
Problem
Conventional wireless security systems often experience interference from nearby systems, which affects their ability to detect and respond to threats effectively within secured areas.
Innovation Solution
The implementation of a frequency hopping sequence with a fixed offset, where each security system uses a reference frequency hopping sequence and adjusts it by adding an integer multiple to avoid frequency collisions, ensuring non-overlapping communication channels and minimizing interference between adjacent systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple security systems operate in close proximity using conventional frequency hopping patterns, then coverage area is increased, but interference between systems increases
Solution Approach 1:
The frequency spectrum is segmented into multiple orthogonal channel sequences, where each security system is assigned a unique sequence. This segmentation allows multiple systems to operate simultaneously in the same geographic area without interference, as each system transmits on its own dedicated frequency sequence.
Solution Approach 2:
The patent introduces an additional dimension of differentiation beyond simple frequency selection by using orthogonal sequences. Systems are distinguished not just by frequency but by their unique hopping sequence patterns, enabling multiple systems to coexist in the same frequency band through sequence orthogonality.
2Reliability
If security systems use fixed frequency offsets from a reference hopping pattern, then frequency collisions are avoided, but system complexity increases
Solution Approach 1:
The patent changes the frequency parameter by applying fixed offsets to the reference hopping pattern. Each system uses the same base sequence but shifts it by a predetermined offset value, transforming a single frequency sequence into multiple orthogonal sequences through parameter modification.
Solution Approach 2:
The reference hopping pattern is copied and reused by multiple systems, each applying their unique offset. This copying approach simplifies implementation compared to generating entirely separate sequences, as systems can store one reference pattern and derive their operational sequences through offset application.
3Reliability
If sensors continuously monitor for threats, then detection reliability is improved, but battery consumption increases
Solution Approach 1:
Sensors perform periodic synchronization with control panels at predetermined intervals rather than continuous communication. This periodic action maintains detection reliability by ensuring sensors remain synchronized with the frequency hopping sequence while significantly reducing battery consumption compared to continuous monitoring.
Solution Approach 2:
Sensors autonomously synchronize with control panels using the established frequency hopping sequences without requiring continuous active communication. The periodic synchronization mechanism allows sensors to self-maintain their operational state efficiently, balancing reliability with energy conservation.
Data Source
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AI summary
A system including a control panel of a security system, a memory of the security system having a reference frequency hopping pattern and a reference frequency offset saved therein, a plurality of wireless threat sensors that communicate with the control panel using the reference frequency hopping pattern and a fixed frequency offset for each frequency and each hop of the reference frequency hop pattern where the fixed frequency offset is an integer multiple of the reference frequency offset, a processor of the security system that detects any nearby security systems that use the reference frequency hopping sequence and that determines the integer multiple of the reference frequency offset used by each of the nearby security systems and a processor that sets the fixed frequency offset used by the plurality of sensors at a selected integer multiple of the reference frequency offset that is not used by any nearby security system.