A Roadmap for NF-ISAC in 6G: A Comprehensive Overview and Tutorial

Area of Science:

• Wireless communication networks
• Signal processing
• Electromagnetics

Background:

• Integrated Sensing and Communication (ISAC) systems combine communication and sensing functionalities.
• Traditional far-field (FF) ISAC systems face limitations in performance and resource utilization.
• Near-field (NF) ISAC offers potential advantages by exploiting unique spherical wave propagation characteristics.

Purpose of the Study:

• To provide a comprehensive survey of Near-field (NF) ISAC technology.
• To analyze the advantages and design philosophies of NF-ISAC compared to FF-ISAC.
• To identify future research directions and challenges in NF-ISAC.

Main Methods:

• Systematic exploration of NF-ISAC technology and its comparison with FF-ISAC.
• Analysis of various scenarios, channel models, and system bandwidths (narrow-band and wide-band).
• In-depth insights through case studies and simulations of NF-ISAC design philosophies.

Main Results:

• NF-ISAC systems demonstrate improved communication and sensing performance by utilizing the additional distance dimension in NF spherical waves.
• NF-ISAC maximizes resource utilization through shared hardware and radio frequency (RF) resources.
• The study provides a detailed review of existing NF-ISAC literature, methodologies, and potential applications.

Conclusions:

• NF-ISAC is a promising technology for future wireless networks, offering enhanced performance and efficiency.
• Further research is needed to address the challenges and fully realize the potential of NF-ISAC.
• The paper lays the groundwork for future advancements in NF-ISAC systems.