GI-ISAC Waveform Segmentation for CP-OFDM-Compatible RF Sensing
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Solution Overview
Problem
Traditional orthogonal frequency-division multiplexing (OFDM) communication schemes using a cyclic prefix (CP) have limitations in supporting integrated radio frequency (RF) sensing and communication, leading to inefficiencies and interference issues.
Innovation Solution
Implementing a guard interval (GI)-based integrated sensing and communications (ISAC) waveform that utilizes OFDM communication data symbols to enable efficient and interference-free RF sensing and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional CP-OFDM communication scheme is used, then communication compatibility is maintained, but RF sensing performance deteriorates due to interference and inefficiency
Solution Approach 1:
The OFDM symbol is segmented into data portion and guard interval portion, where the guard interval is extracted from the data symbols themselves. This segmentation allows the same waveform to serve dual purposes: communication data transmission and RF sensing reference signal, thereby resolving the contradiction between communication compatibility and sensing performance.
Solution Approach 2:
The patent makes the OFDM waveform universal by enabling it to perform both communication and sensing functions simultaneously. The guard interval ISAC waveform acts as both a communication signal and a sensing reference signal, eliminating the need for separate waveforms and resolving the trade-off between maintaining communication compatibility and achieving accurate RF sensing.
2Measurement precision
If separate waveforms are used for communication and sensing, then sensing performance is improved, but device complexity and spectrum efficiency worsen
Solution Approach 1:
The patent merges the communication waveform and sensing reference signal into a single unified waveform. The guard interval portion of the OFDM symbol serves dual purposes as both communication overhead and sensing reference signal, thereby reducing device complexity and improving spectrum efficiency while maintaining sensing performance.
Solution Approach 2:
By designing a universal ISAC waveform that performs both communication and sensing functions, the patent eliminates the need to manage separate waveforms. The guard interval ISAC waveform provides multi-functionality, resolving the contradiction between improved sensing performance and reduced system complexity.
3Productivity
If guard interval ISAC waveform is used, then spectrum efficiency and hardware reuse are improved, but compatibility with traditional CP-OFDM may deteriorate
Solution Approach 1:
The OFDM symbol structure is segmented such that the guard interval contains ISAC reference signals while the data portion maintains traditional CP-OFDM structure. This segmentation allows receivers to process traditional CP-OFDM signals normally while enabling ISAC functionality through the guard interval portion, thus resolving the compatibility issue while improving spectrum efficiency.
Data Source
AI summary
In some implementations, a wireless device may perform integrated radio frequency (RF) sensing and communications by receiving a guard interval integrated sensing and communications (GI-ISAC) configuration at the wireless device from a configuring node of a wireless network, where the GI-ISAC configuration is indicative of a set of one or more parameters describing characteristics of a GI-ISAC waveform to be used by the wireless device for RF sensing, and where the set of one or more parameters describing characteristics of the GI-ISAC waveform is based at least in part on orthogonal frequency division multiplexing (OFDM) communication data symbols used by the wireless network. In addition, the wireless device may perform an RF sensing function with the wireless device in accordance with the GI-ISAC configuration.