Selective Channel Removal in Multi-Channel Wake-Up Receivers
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Solution Overview
Problem
Existing wireless sensor network wake-up radios face challenges in detecting wake-up signals in the presence of interference, leading to increased latency and power consumption due to the need for frequent channel monitoring and retransmissions.
Innovation Solution
A method and device for detecting wake-up signals by splitting the signal across multiple frequency channels and time slots, determining signal quality, and removing channels with low signal-to-interference-plus-noise ratio, thereby reducing processing complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single narrow-band channel is used for wake-up signal transmission, then the system complexity is minimized and power consumption is reduced, but the probability of detection decreases and wake-up latency increases when interferers are present
Solution Approach 1:
The wake-up signal is segmented across multiple frequency channels instead of using a single channel. The transmitter divides the wake-up signal into multiple frequency components, and the receiver processes these distributed channels to detect the signal. This segmentation provides frequency diversity, allowing the system to overcome narrow-band interference while maintaining reasonable complexity through selective channel processing.
2Power
If the wake-up signal is transmitted on a single frequency channel, then the transmission is simple and power consumption is low, but long wake-up latencies occur when interferers are present due to multiple retransmissions
Solution Approach 1:
The system transitions from single-channel transmission to multi-channel transmission by adding the frequency dimension. The wake-up signal is distributed across multiple frequency channels, creating a time-frequency grid structure. This dimensional expansion allows the receiver to exploit frequency diversity and detect signals more reliably without increasing transmit power, thereby reducing wake-up latency caused by retransmissions.
3Reliability
If multiple frequency channels are processed in parallel at the receiver, then the probability of detection is improved in interference scenarios, but the receiver processing complexity and power consumption increase
Solution Approach 1:
The receiver extracts and processes only the relevant frequency channels that contain wake-up signal components, rather than processing all possible channels. By identifying and isolating the specific channels where wake-up signals are transmitted, the system reduces the effective processing burden while maintaining detection reliability. This selective extraction approach balances between comprehensive multi-channel processing and computational efficiency.
4Speed
If channel monitoring is performed frequently to meet latency requirements, then the wake-up detection speed is improved, but the power consumption of idle listening increases dramatically
Solution Approach 1:
The wake-up radio employs periodic channel monitoring instead of continuous monitoring. The simplified wake-up radio wakes up at predetermined intervals to check for wake-up signals on multiple frequency channels, then returns to sleep mode. This periodic operation maintains acceptable wake-up detection speed by checking channels frequently enough to meet latency requirements while dramatically reducing average power consumption compared to continuous monitoring.
Data Source
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AI summary
The present invention is related to a method for detecting a transmitted wake-up signal in a wireless communication system comprising a plurality of communication nodes. The method comprises the steps of: receiving at a communication node of said plurality a transmitted wake-up signal, said wake-up signal being split over a plurality of frequency channels and a plurality of time slots, determining per frequency channel an indication of the signal quality on that frequency channel, deciding per frequency channel on removing the signal portion corresponding to that frequency channel, based on the indication of the signal quality, thereby obtaining a reduced received wake-up signal, correlating the reduced received wake-up signal with a version of a local copy of the transmitted wake-up signal, detecting the transmitted wake-up signal from the result of the correlation step.