Joint Communication-Sensing Precoding for Spectral Efficiency
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Solution Overview
Problem
Joint communications and sensing signaling in wireless networks face challenges due to competition for common physical resources, leading to depletion of orthogonal resources and increased interference, which affects spectral efficiency and network performance.
Innovation Solution
A scalable transform-based multiplexing precoder is employed to non-orthogonally multiplex communications and sensing signals, using a truncated DFT precoder to minimize intra-signal interference and efficiently utilize existing resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If orthogonal resources are allocated for communications and sensing signals, then interference between signals is minimized, but spectral efficiency deteriorates due to resource depletion
Solution Approach 1:
The patent combines communications signals and sensing reference signals into a single joint signal transmission. The transmitting device generates a joint communication and sensing signal that incorporates both types of information, allowing simultaneous transmission over the same physical resources without requiring separate orthogonal allocations, thereby improving spectral efficiency while managing interference through coordinated signal design
Solution Approach 2:
The patent enables physical resources to serve dual purposes by making them multi-functional. The same time-frequency resources are used for both communications data transmission and sensing reference signal transmission, allowing the network to simultaneously support both communication services and sensing services without dedicating separate resources to each function
2Productivity
If non-orthogonal multiplexing is used for communications and sensing signals, then spectral efficiency is improved by efficient resource utilization, but interference between signals increases
Solution Approach 1:
The patent transforms the signal structure by changing parameters such as applying different precoding matrices, power allocation ratios, and resource element mappings to the communications and sensing components. The transmitting device adjusts these parameters to optimize the joint signal, and the receiving device uses corresponding parameter knowledge to separate and process the combined signal, thereby managing interference while maintaining high spectral efficiency
Solution Approach 2:
The patent implements feedback mechanisms where the receiving device processes the joint communication and sensing signal and provides feedback information to the transmitting device. This feedback loop enables the transmitting device to adjust its signal generation parameters, precoding strategies, and resource allocation based on channel conditions and interference levels, thereby optimizing spectral efficiency while controlling intra-signal interference
Data Source
AI summary
Various aspects of the present disclosure relate to utilizing non-orthogonal multiplexing of both communications and sensing signals between transmission nodes and receiving nodes and over available physical resources. In some embodiments, the present disclosure describes a scalable transform-based multiplexing precoder for joint communications and sensing signals.