Time-Frequency Signal Overlap for Low-Power Wireless Receivers
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Solution Overview
Problem
Existing communication systems face challenges in efficiently utilizing resources when transmitting signals using low-order modulation schemes like amplitude keying or envelope detection, particularly in low-power and low-complexity receivers, leading to suboptimal resource utilization ratios.
Innovation Solution
The proposed solution involves multiplexing time-frequency resources of a first target signal carrying information with a second target signal received based on an envelope detection scheme or amplitude-modulated signal, allowing overlap in time-frequency resources to improve resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-frequency resources are allocated separately for first target signal and second target signal, then signal reception reliability is improved, but resource utilization ratio deteriorates
Solution Approach 1:
The patent merges the time-frequency resource allocation for the first target signal (carried by normal receiver) and the second target signal (carried by low-power receiver) by allowing their time-frequency resources to overlap. This combining approach enables both signals to share the same time-frequency resources, thereby improving resource utilization ratio while maintaining signal reception reliability through the use of different receiver paths with appropriate signal processing.
2Use of energy by moving object
If low-power consumption receiver is used for second target signal, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent segments the receiver functionality into two distinct paths: a normal receiver for receiving the first target signal and a low-power consumption receiver for receiving the second target signal. This segmentation allows the low-power receiver to use simpler envelope detection or amplitude modulation schemes specifically optimized for power efficiency, while the normal receiver handles the first target signal with full processing capabilities, thus reducing overall power consumption without excessively increasing device complexity.
Solution Approach 2:
The patent applies partial action by implementing envelope detection or amplitude modulation for the second target signal, which provides sufficient functionality for wake-up or low-data-rate applications without the full complexity of a complete digital signal processing chain. This partial implementation achieves adequate performance for specific use cases while significantly reducing power consumption and complexity compared to a full-featured receiver.
3Productivity
If high-order modulation scheme is used for first target signal, then information transmission efficiency is improved, but signal detection difficulty increases
Solution Approach 1:
The patent introduces an intermediary approach by using envelope detection or amplitude modulation as a intermediate processing stage for the second target signal. This intermediary method extracts the essential information from the amplitude variations of the signal, providing a simplified detection path that reduces the difficulty of signal detection while maintaining adequate information transmission efficiency for applications that do not require high data rates.
Data Source
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AI summary
A wireless communication method and a device are provided, and the method includes: transmitting, by a first device, a first target signal and a second target signal, where the first target signal is used to carry information to be transmitted, the second target signal is a signal received based on an envelope detection scheme or an amplitude-modulated signal, and a time-frequency resource of the first target signal overlaps with a time-frequency resource of the second target signal.