Wake-Up Signal Pattern Detection for Low-Power Wireless Reception
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Solution Overview
Problem
Conventional wireless communication devices face challenges in accurately detecting wake-up signals in noisy field environments due to the low power consumption requirements, where the wake-up signal level may not be sufficiently higher than the noise level.
Innovation Solution
A communication system that includes a transmission device transmitting a cyclical wake-up signal with a specific pattern, such as a long pulse, and a reception device with a standby circuit that outputs a detection signal when the specific pattern is detected, allowing the reception circuit to switch to data reception mode with low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional standby circuit is used to detect wake-up signals, then power consumption is reduced by avoiding always-on reception circuit operation, but detection accuracy deteriorates in noisy field environments where the wake-up signal level is not sufficiently higher than the noise level
Solution Approach 1:
The wake-up signal is transmitted periodically at fixed time intervals, and the standby circuit detects this periodic pattern to distinguish it from random noise. This periodic transmission allows the receiver to identify the signal through its regular timing structure even when the signal level is close to the noise level.
Solution Approach 2:
The wake-up signal uses a specific pattern (such as a long pulse with radio field intensity continuously higher than a threshold during a time period longer than the maximum frame period) that is distinct from noise. This pattern recognition enables the standby circuit to differentiate the signal from noise based on its unique characteristics rather than just signal level.
2Use of energy by moving object
If the wake-up signal level is reduced to achieve lower power consumption, then energy efficiency improves, but the signal becomes more difficult to distinguish from noise
Solution Approach 1:
By transmitting the wake-up signal periodically rather than continuously, the system reduces overall energy consumption while maintaining detectability. The periodic nature creates a recognizable pattern that the standby circuit can detect even at lower signal levels, as the regular timing distinguishes it from random noise occurrences.
Solution Approach 2:
The invention changes the temporal parameters of the wake-up signal by using a long pulse duration (longer than the maximum frame period in data transmission) and specific timing intervals. This parameter change allows the signal to be detected through its temporal characteristics rather than relying solely on signal amplitude, enabling lower power operation while maintaining detection reliability.
Data Source
AI summary
A communication system including a transmission device and a reception device which wirelessly communicate with each other. The transmission device includes a transmission circuit that performs: cyclical transmission of a wake-up signal including a specific pattern; and transmission of data. The reception device includes: a standby circuit that receives a signal, and outputs a detection signal indicating reception of the wake up signal when detecting that the specific pattern is cyclically included in the signal received; and a reception circuit that receives the data from the transmission device after the detection signal is output from the standby circuit.