Wake-Up Signal Segmentation for Interference-Resistant Receivers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wake-up receivers (WURs) face high vulnerability to interference due to inaccurate local oscillator signals, leading to increased power consumption and limited filtering capabilities, which compromises their ability to detect wake-up signals reliably.
Innovation Solution
Generate and transmit wake-up signals (WUS) over a frequency range with a signal bandwidth larger than twice the information symbol rate, using multiple carrier frequencies and pilot signals for frequency synchronization, enabling narrow filtering and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If OOK modulation is used for wake-up signal to avoid accurate LO signal, then power consumption of WUR is reduced, but vulnerability to interference increases
Solution Approach 1:
The wake-up signal is segmented into multiple frequency intervals, where each interval conveys the complete digital WUS sequence. This segmentation allows the receiver to process narrower frequency bands independently, enabling the use of narrow filters without requiring an accurate frequency reference, thus reducing power consumption while maintaining interference resistance
Solution Approach 2:
The patent transitions from a single-carrier frequency approach to a multi-frequency interval approach. By distributing the WUS sequence across multiple frequency intervals with appropriate spacing, the system enables frequency diversity without requiring precise frequency synchronization at the low-power WUR, effectively adding a frequency dimension to the signal structure
2Reliability
If narrow filtering is applied to improve interference resistance, then vulnerability to adjacent frequency interference is reduced, but signal bandwidth requirements increase
Solution Approach 1:
The wide frequency range is segmented into multiple narrower frequency intervals, each capable of conveying the complete WUS sequence. This allows the use of narrow filters at the receiver while the overall system maintains wide frequency coverage through the segmented structure, resolving the contradiction between narrow filtering and bandwidth requirements
Data Source
AI summary
A method for a wake-up transmitter comprises generating a wakeup signal (WUS) from a digital WUS sequence having an information symbol rate and a corresponding information symbol bandwidth, and transmitting the WUS over a frequency range having a signal bandwidth, wherein the signal bandwidth is larger than twice the information symbol rate, and wherein any frequency interval comprised in the frequency range conveys the digital WUS sequence when a width of the frequency interval is at least the information symbol bandwidth. A corresponding method for a wake-up receiver comprises receiving the WUS over the frequency range, and filtering the received WUS through a filter having a filter bandwidth for passing the information symbol bandwidth of the received WUS. Corresponding apparatuses, wake-up transmitter, wake-up receiver, communication device and computer program product are also disclosed.