Sensor Nodes Using Unique Pulse Signatures for Scalable Communication
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Solution Overview
Problem
Existing sensor-based communication systems for artificial somatosensory perception face challenges such as poor scalability, high transmission latency, susceptibility to damage, and inability to detect transient contact stimuli due to conventional TDMA, CDMA, AER, and Ethernet-based communication arrangements.
Innovation Solution
A sensor-based communication apparatus that uses unique pulse signatures transmitted independently by sensor nodes upon stimulus detection, allowing for efficient signaling and reducing the probability of pulse collisions, with each inter-pulse interval having a unique duration to enhance Signal to Interference and Noise Ratio (SINR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If TDMA architectures are used for sensor signal communication, then sensors can be sampled at predetermined frequencies, but transmission latency increases and scalability deteriorates in larger arrays
Solution Approach 1:
The patent applies periodic action by using pulse signatures with specific temporal patterns and inter-pulse intervals that are periodically structured. Each sensor node transmits pulses at predetermined intervals defined by its unique signature, enabling systematic sampling without sequential delays. This periodic structure allows simultaneous transmission from multiple sensors while maintaining predictable timing for reconstruction, resolving the latency issue inherent in sequential TDMA sampling.
Solution Approach 2:
The system transitions from static sequential sampling to dynamic simultaneous transmission. Sensor nodes dynamically transmit their pulse signatures independently based on detected stimuli rather than waiting for sequential time slots. This dynamic approach allows the system to adapt to stimulus events in real-time while maintaining scalability, as each node operates autonomously without being constrained by centralized scheduling delays.
2Ease of operation
If conventional row-column wiring is used for addressing individual sensors, then sensor addressing is simplified, but the wiring becomes prone to damage
Solution Approach 1:
The patent extracts the addressing function from physical wiring structures and embeds it directly into the signal domain through unique pulse signatures. Instead of relying on vulnerable row-column wire intersections for identification, each sensor node carries its identity information within its transmitted pulse pattern. This extraction of the addressing function from the physical layer to the signal layer eliminates the fragility of conventional wiring while maintaining addressing capability through the inherent structure of the pulse signatures.
Solution Approach 2:
The pulse signature acts as an intermediary that carries both data and identification information. Rather than using separate wiring for addressing and data transmission, the unique pulse signature serves as a mediator that embeds sensor identity within the transmitted signal itself. This intermediary approach allows multiple sensors to share common communication pathways without requiring vulnerable point-to-point wiring, thereby improving reliability while maintaining addressing simplicity.
3Use of energy by moving object
If low sensor sampling frequency is used, then power consumption is reduced, but transient contact stimuli such as needle prick or object slip are missed
Solution Approach 1:
The system uses periodic pulse transmission with inter-pulse intervals that are sufficiently short to capture transient events. Each sensor node transmits pulses at regular intervals defined by its unique signature, ensuring that even brief contact stimuli are captured within the periodic sampling window. The periodic structure maintains low power consumption by keeping sensors in a low-power state between transmissions while ensuring transient events are detected within each periodic cycle.
Solution Approach 2:
The system prepares for transient event detection by maintaining ready-to-transmit sensor nodes with pre-configured pulse signatures. Rather than increasing overall sampling frequency across all sensors, the system keeps individual nodes prepared to transmit immediately upon stimulus detection. This preliminary preparation allows rapid response to transient events without requiring continuous high-frequency sampling from all sensors, thus balancing power consumption with detection precision.
4Productivity
If CDMA techniques are used for wireless signal communication, then more sensors can communicate simultaneously, but system complexity increases due to signal modulation requirements
Solution Approach 1:
The patent uses pulse signature copying where each sensor node transmits a unique temporal pattern that can be replicated and identified at the receiver. Instead of implementing complex modulation schemes, the system creates distinct copies of pulse patterns with unique inter-pulse intervals for each sensor. This copying approach allows simultaneous communication from multiple sensors while maintaining simple transmission hardware, as each node merely needs to generate and transmit its predetermined pulse signature without complex signal processing.
Solution Approach 2:
The system distinguishes between multiple sensors by changing temporal parameters of pulse signatures rather than using complex frequency or phase modulation. Each sensor node is assigned a unique pattern defined by specific inter-pulse intervals and pulse durations. This parameter-based differentiation in the time domain achieves multiplexing capability without requiring intermediate frequency modulation or carrier frequency translation, thereby reducing device complexity while maintaining simultaneous communication capacity.
5Ease of manufacture
If CDMA uses level shifted codes, then encoding is simplified, but the system becomes susceptible to low frequency interferences such as AC power noises
Solution Approach 1:
The system uses periodic pulse patterns with specific inter-pulse intervals that create high-frequency temporal signatures. Rather than using level-shifted DC codes vulnerable to low-frequency noise, each sensor transmits a series of pulses with predetermined intervals. This periodic high-frequency action pushes the signal spectrum away from low-frequency interference bands, reducing susceptibility to AC power noises while maintaining encoding simplicity through the regular pulse structure.
Solution Approach 2:
The system pre-configures pulse signatures with inter-pulse intervals designed to avoid low-frequency interference bands. By preliminarily establishing temporal patterns with sufficient pulse frequency content, the system proactively prevents vulnerability to AC power noise before transmission occurs. This preliminary design of pulse timing parameters ensures that the encoded signals operate in frequency ranges less susceptible to common low-frequency interferences while maintaining simple encoding logic.
6Productivity
If AER with asynchronous hand-shakes is used, then data packets can be time-multiplexed on a first-come-first-served basis, but arbitration logic complexity increases to handle packet collisions
Solution Approach 1:
The system implements self-service arbitration where each sensor node independently transmits its pulse signature without requiring centralized arbitration logic. The unique temporal patterns of pulse signatures enable automatic identification and separation of simultaneous transmissions at the receiver end. This self-service approach eliminates the need for complex collision detection and arbitration circuits, as each node autonomously manages its own transmission timing based on its predetermined signature pattern.
Solution Approach 2:
The system uses copied pulse signatures with unique temporal identifiers that enable automatic differentiation of simultaneous transmissions. Instead of requiring arbitration logic to manage packet collisions, each sensor transmits a copy of its unique pulse pattern that can be independently identified at the receiver. This copying strategy with distinct temporal signatures allows the system to handle multiple simultaneous transmissions without collision detection complexity, as receiver correlation can separate the copied patterns based on their unique inter-pulse intervals.
Data Source
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AI summary
In a described embodiment, a sensor-based communication apparatus (100) is disclosed. The communication apparatus (100) comprises a plurality of sensor nodes (112) associated with respective unique pulse signatures (200) and adapted to communicate with respective sensors (113) with each sensor (113) configured to generate a sensory signal (113a) in response to a respective stimulus (113b). Each sensor node (112) is triggered, upon receipt of the corresponding sensory signal (113a), to transmit the associated unique pulse signature (200) independently and asynchronously through a transmission medium (110) shared by the sensor nodes (112), and the unique pulse signatures (200) transmitted by the sensor nodes (112) being a representation (300) of a stimulus event associated with the stimuli detected by the corresponding sensors (113). A method and a communication medium are also disclosed.