Orthogonal Signal Multiplexing for Non-Coherent Wake-Up Detection
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Solution Overview
Problem
Existing communication systems face inefficiencies in multiplexing wake-up signals (WUS) for user equipment (UE) due to the use of complex-valued sequences that require coherent detection, leading to unnecessary resource allocation and power consumption, especially when using non-coherent detection methods.
Innovation Solution
A communication device employs a matrix-based approach to generate transmission symbols using integer-valued information symbols and a multiplexing matrix, allowing non-coherent detection of signals, such as FSK or OOK, on shared time-frequency resources, thereby optimizing resource use and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex-valued sequences are used for wake-up signal transmission, then coherent detection can be achieved, but device complexity and power consumption increase
Solution Approach 1:
The patent changes the detection parameter from coherent detection (requiring phase information) to non-coherent detection (using only envelope or power information). This allows the use of simpler receivers that don't need to track phase variations, reducing receiver complexity while maintaining detection capability through energy-based detection of the wake-up signal
2Reliability
If separate time-frequency resources are allocated for wake-up signals, then signal detection reliability is improved, but spectral efficiency decreases
Solution Approach 1:
The patent merges the wake-up signal transmission with regular data communication by using the same time-frequency resources for both purposes. The base station transmits wake-up indicators for multiple UEs multiplexed with regular downlink data signals, eliminating the need for separate dedicated resources and thereby improving spectral efficiency while maintaining reliable wake-up detection through non-coherent detection methods
3Productivity
If multiple wake-up signals are transmitted simultaneously on shared resources, then spectral efficiency improves, but detection difficulty increases
Solution Approach 1:
The patent segments the wake-up signal detection process by assigning unique identifiers (such as RNTI values) to different UE groups or individual UEs. The base station transmits wake-up indicators with these identifiers, and receivers filter and detect signals based on their specific identifiers. This segmentation allows multiple signals to be transmitted simultaneously on shared resources while maintaining ease of detection through identifier-based filtering and differentiation
Data Source
AI summary
Embodiments of the invention relate to multiplexing of signals in a communication system. A first communication device obtains a vector b comprising M number of integer valued information symbols from a set {0, 1, . . . , q−1}, where q=2Q and where Q is a positive integer; and obtains a N×M matrix C comprising symbols from the set {0, 1, . . . , q−1}, where N is a positive integer such that M≤N. The matrix C is multiplied with the vector b modulo-q to obtain a vector y comprising N number of transmission symbols, wherein each transmission symbol in the vector y is associated with one of q number of signals. An associated signal is transmitted for each transmission symbol in the vector y to one or more receivers.