Delay-Shift JCS Waveform for 5G RF Sensing and Communication
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently integrating radio frequency (RF) sensing and communication functions, particularly in 5G networks, where simultaneous operation of radar-type sensing and communication is not effectively supported.
Innovation Solution
A modulation scheme using delay shift coding is employed to generate a joint communication and sensing (JCS) waveform, enabling a single waveform for both RF sensing and communication by modulating information bits onto symbols and demodulating based on delay shifts within sensing symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate waveforms are used for RF sensing and communication, then each function can be independently optimized, but system complexity increases and spectral efficiency decreases
Solution Approach 1:
The patent combines RF sensing and communication functions into a single joint waveform. The communication signal is modulated onto sensing symbols with embedded delay shifts, allowing both sensing and communication to be performed simultaneously over the same time-frequency resources, thereby improving spectral efficiency and reducing system complexity
Solution Approach 2:
The patent creates a universal waveform that serves dual purposes: the delayed sensing symbols enable RF sensing through time-of-flight measurements, while the embedded communication bits are transmitted through the same waveform. This multi-functional approach eliminates the need for separate dedicated sensing and communication waveforms
2Loss of information
If delay shift coding is applied to modulate information bits, then communication capacity is enabled, but sensing precision may be affected
Solution Approach 1:
The patent applies different properties to different parts of the sensing symbols: the delay shift encoding is applied locally to specific sensing symbols to convey communication bits, while other sensing symbols maintain their original timing characteristics for accurate sensing. This localized differentiation allows both communication and sensing to coexist without significantly degrading sensing precision
Solution Approach 2:
The patent uses delay shift as a modifiable parameter of the sensing symbols to encode communication information. By varying the time delay of specific sensing symbols based on the communication bits, the system embeds communication capacity while maintaining the fundamental sensing functionality through appropriate delay selection
Data Source
AI summary
Disclosed are techniques for wireless sensing. In an aspect, a transmitter device modulates one or more information bits onto one or more sensing symbols based on a delay shift coding scheme to generate a joint communication and sensing (JCS) waveform, wherein the delay shift coding scheme provides a delay shift from a symbol boundary of each of the one or more sensing symbols to a sensing period within each of the one or more sensing symbols, and transmits the JCS waveform, wherein the JCS waveform comprises a sensing waveform within the sensing period within each of the one or more sensing symbols.