Wake-On-Signal Detection for Low-Power FM Communication Nodes
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Solution Overview
Problem
Frequency-modulation based communication protocols, such as OFDM, lack a reliable wake-up function to transition nodes from a non-active power mode to an active power mode, leading to inefficient power consumption in power-sensitive systems.
Innovation Solution
Implementing a wake-on-signal module in network nodes that filters and digitizes incoming signals to detect a predefined wake-up data pattern, generating an interrupt signal to activate nodes when the pattern is matched, thereby transitioning them to an active power mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency-modulation based communication protocols are used, then communication efficiency is improved, but wake-up function capability deteriorates
Solution Approach 1:
The communication protocol is segmented into two distinct parts: a wake-up signal portion using amplitude modulation with predefined patterns, and a data communication portion using frequency modulation. This segmentation allows the system to maintain FM communication efficiency while adding a dedicated wake-up mechanism that operates independently from the main communication protocol.
Solution Approach 2:
The low-pass filter and pattern detector components are designed to universally detect various wake-up patterns regardless of the specific FM communication protocol being used. The wake-up signal structure can be universally applied across different FM-based communication systems, making the solution broadly applicable while maintaining protocol-specific data communication performance.
2Use of energy by moving object
If nodes operate in non-active power mode, then power consumption is reduced, but ability to receive and respond to wake-up signals deteriorates
Solution Approach 1:
The wake-up signal detection functionality is extracted as a separate, dedicated subsystem that operates independently from the main node processing units. This extracted wake-up receiver can remain in a low-power state while still monitoring for wake-up signals, allowing the main node to stay in non-active mode with minimal power consumption while maintaining the ability to be woken up reliably.
Solution Approach 2:
The wake-up detection circuitry is designed to continuously monitor for wake-up signals even when the node is in non-active mode, performing the detection action in advance before full node activation is required. This preliminary detection capability ensures that nodes can respond to wake-up calls immediately upon receiving the signal, maintaining reliable wake-up functionality while minimizing power consumption during idle periods.
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
Enables efficient power conservation by ensuring nodes only activate upon receiving the specific wake-up signal, reducing unnecessary power consumption and enhancing power management in frequency-modulation based networks.
Implementation Method 1
a low pass filter coupled to receive a signal indicative of an incoming signal on the communication medium, the incoming signal being transmitted using the frequency-modulation based communication protocol, the low pass filter generating a filtered signal indicative of an envelope of the incoming signal
Data Source
AI summary
A system and method implements a wakeup function in a frequency-modulation based data communication network. In particular, a wakeup function is implemented which transmits a wake up data pattern (Wake On Signal) over the data links between network nodes in a frequency-modulation based data communication system to enable an inactive node to be awaken and transition to an active or operational power mode.