Wake-Up Signal False Detection Mitigation
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Solution Overview
Problem
Wake-up receivers in wireless communication systems experience false detections due to non-negligible autocorrelation in MC-OOK signals, leading to unnecessary actions and inefficiencies in legacy receivers.
Innovation Solution
The method involves transmitting a wake-up signal with non-overlapping frequency intervals, where the first signal part has a high autocorrelation value and additional signal parts are specifically constructed to reduce the overall autocorrelation value, thereby mitigating false detections by de-correlating the signal as seen by legacy receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MC-OOK signaling is used for wake-up signals, then wake-up receiver performance is improved, but false detection in legacy receivers increases
Solution Approach 1:
The wake-up signal is divided into multiple non-overlapping frequency intervals (first frequency interval for wake-up signal, second frequency interval for additional signal). This segmentation allows the wake-up receiver to process only the relevant frequency interval while legacy receivers experience reduced false detection due to the de-correlating effect of the additional signal in the second frequency interval.
Solution Approach 2:
Different frequency intervals are assigned different signal characteristics. The first frequency interval contains the MC-OOK wake-up signal optimized for wake-up receiver detection, while the second frequency interval contains an additional signal specifically designed to reduce autocorrelation and mitigate false detections in legacy receivers. Each frequency interval serves a localized function.
2Object-generated harmful factors
If additional signal parts are added to reduce autocorrelation, then false detection is reduced, but signal complexity increases
Solution Approach 1:
The solution moves from time-domain signal processing to frequency-domain signal construction. By using non-overlapping frequency intervals and constructing signals in the frequency domain, the complexity of managing multiple time-domain signals is reduced. The additional signal is added in the frequency domain, simplifying the overall signal construction process while achieving the de-correlating effect.
Data Source
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AI summary
A method for a wireless transmitter is disclosed. The method comprises transmitting a wake-up signal over a frequency range during a time interval by transmitting a first signal part over a first frequency interval within the frequency range during the time interval and transmitting a second signal part over a second frequency interval within the frequency range during the time interval. The first and second frequency intervals are non-overlapping. The first signal part has a first auto-correlation value, and the second signal part is specifically constructed to provide a second autocorrelation value of the signal comprising the first and second signal parts which is lower than the first auto-correlation value. The invention to solve the problem of false detection of an MC-OOK modulated wake-up signal in an IEEE 802.11 system using OFDM.