Waveform-Coded Multicarrier Wake-Up Radio for Low-Power Detection
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Solution Overview
Problem
Low data rate receiver systems, such as Wake Up Radios, face challenges in power consumption, requiring an efficient wake-up signal detection mechanism to conserve energy in wireless communication devices with limited power supplies.
Innovation Solution
The method involves waveform-coding successive on-off-keying (OOK) mapped data bits onto multicarrier modulated symbols with alternating sub-carriers set to ones and zeros, using OFDM modulation with a guard interval, and Manchester-coding to transmit a wake-up signal over a wireless channel, allowing for low power consumption and efficient detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the WLAN receiver circuit is always on to enable wake-up detection, then the wake-up signal can be detected reliably, but the power consumption increases significantly
Solution Approach 1:
The receiver system is segmented into two distinct parts: a always-on Wake Up Radio (WUR) circuit with minimal power consumption dedicated solely to wake-up signal detection, and a main WLAN receiver circuit that can be powered down. This segmentation allows the wake-up detection function to operate independently with optimized power efficiency while maintaining reliability.
Solution Approach 2:
The WUR circuit is designed as a simplified, low-cost receiver that consumes minimal power and is intended to operate only for wake-up detection. Once a wake-up signal is detected, the WUR's function is complete and it can be powered down, while the main WLAN receiver is activated. This approach uses a dedicated simple component for a specific temporary function to avoid the high power cost of keeping the full WLAN receiver always on.
2Device complexity
If a simple detection algorithm is used in the WUR to reduce complexity, then power consumption decreases, but the detection capability may be limited
Solution Approach 1:
The detection capability is optimized locally for the specific wake-up signal characteristics rather than providing general-purpose high-complexity detection. The WUR uses a simplified detection algorithm tailored to recognize the specific multicarrier modulated wake-up signal format, achieving reliable detection for this particular signal type while keeping overall complexity low. The full detection capability is then handed off to the main WLAN receiver which has higher processing power.
Data Source
AI summary
Waveform-coding is applied to map successive on-off-keying (OOK) data bits onto successive multicarrier modulated symbols in time domain, wherein each multicarrier modulated symbol includes a set of sub-carriers in which alternating sub-carriers are set to ones and zeros in frequency domain. The waveform coded multicarrier modulated symbols are up-converted to a carrier frequency to provide a data signal that is transmitted over a wireless channel.