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Manuscript Submission Deadline 31 January 2023

Future wireless networks are envisioned to provide ultra-high data rate and reliability in challenging transmission scenarios with highly accurate and robust sensing capability. The strong multipath, high delay and severe Doppler features in those challenging environments can impose great challenges for reliable wireless communications and sensing. Thus, this ambitious innovation requires new breakthroughs in wireless technology. Most of the existing wireless technologies are designed in the time-frequency (TF) domain, where the communication reliability relies on the orthogonality between subcarriers. Unfortunately, the overly optimistic orthogonality does not hold over channels with non-negligible Doppler spread. Furthermore, key radar sensing parameters, such as delay and Doppler, are not explicitly represented in TF domain signals. Consequently, conventional TF domain communication waveforms require sophisticated adaptions to cater to radar sensing.

The recent invention of orthogonal time frequency space (OTFS) modulation provides a fundamentally new approach of applying delay-Doppler (DD) domain signal processing for communications. Moreover, DD domain signal processing also provides the potential for low-complexity radar waveform designs, thanks to the explicit representations of delay and Doppler in DD domain signals. As an emerging research topic, DD domain communications and radar sensing offers an exciting new perspective for next-generation wireless innovations.

Despite the promising advantages of DD domain communications and radar sensing, there are some fundamental challenges that need to be solved. For example, owing to the unique features of DD domain channels, conventional TF domain designs cannot be directly extended to the DD domain. Therefore, novel DD domain transceiver designs for communication needs to be developed. Furthermore, connections between communication and radar sensing in the DD domain have not been comprehensively discussed. Consequently, it is not clear how to develop a practical framework to realize both communication and radar functionalities in the DD domain. This Research Topic focuses on the unique challenges of DD domain communications and radar sensing. The main objective of this Research Topic is to exploit the new opportunities for future wireless networks provided by the recent advancement in DD domain signal processing, and to bring this promising vision closer to reality. In particular, this Research Topic will cover various theoretical and practical design issues in DD domain communications and radar sensing, aiming at bringing together researchers, industry practitioners, and individuals working in related areas to share their new ideas, latest findings, and state-of-the-art results.

This Research Topic will provide a comprehensive overview of the state-of-the-art DD domain technology and theory, highlighting its distinct features in comparison to the conventional TF domain designs. It will provide a forum for the latest research, innovations, and applications of DD domain communications and radar sensing, which will help to bridge the gap between theory and practice. We solicit high-quality original research and survey papers on topics including, but not limited to:

Fundamental limits for DD domain communications and radar sensing
DD domain channel estimation, signal detection, and transceiver designs
DD domain MIMO and massive MIMO designs
DD domain orthogonal and non-orthogonal multiple access designs
DD domain communications for URLLC
Channel coding for DD domain communications
Waveform designs for DD domain radar sensing
Coexistence of communication and radar waveforms in the DD domain
DD domain integrated sensing and communications (ISAC)
Machine learning/AI enhanced DD domain communications and radar sensing
Security and privacy issues in DD domain
Intelligent reflecting surface (IRS) -assisted DD domain communications and radar sensing
DD domain communications and radar sensing in mmWave and Tera Hertz frequency bands
Channel measurement and modeling in the DD domain
System-level simulation, prototyping, and field-tests for DD domain communications and radar sensing

Keywords: Delay-Doppler domain communications, delay-Doppler domain radar sensing, delay-Doppler domain signal processing, integrated sensing and communications, orthogonal time frequency space, detection and estimation


Important Note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.

Future wireless networks are envisioned to provide ultra-high data rate and reliability in challenging transmission scenarios with highly accurate and robust sensing capability. The strong multipath, high delay and severe Doppler features in those challenging environments can impose great challenges for reliable wireless communications and sensing. Thus, this ambitious innovation requires new breakthroughs in wireless technology. Most of the existing wireless technologies are designed in the time-frequency (TF) domain, where the communication reliability relies on the orthogonality between subcarriers. Unfortunately, the overly optimistic orthogonality does not hold over channels with non-negligible Doppler spread. Furthermore, key radar sensing parameters, such as delay and Doppler, are not explicitly represented in TF domain signals. Consequently, conventional TF domain communication waveforms require sophisticated adaptions to cater to radar sensing.

The recent invention of orthogonal time frequency space (OTFS) modulation provides a fundamentally new approach of applying delay-Doppler (DD) domain signal processing for communications. Moreover, DD domain signal processing also provides the potential for low-complexity radar waveform designs, thanks to the explicit representations of delay and Doppler in DD domain signals. As an emerging research topic, DD domain communications and radar sensing offers an exciting new perspective for next-generation wireless innovations.

Despite the promising advantages of DD domain communications and radar sensing, there are some fundamental challenges that need to be solved. For example, owing to the unique features of DD domain channels, conventional TF domain designs cannot be directly extended to the DD domain. Therefore, novel DD domain transceiver designs for communication needs to be developed. Furthermore, connections between communication and radar sensing in the DD domain have not been comprehensively discussed. Consequently, it is not clear how to develop a practical framework to realize both communication and radar functionalities in the DD domain. This Research Topic focuses on the unique challenges of DD domain communications and radar sensing. The main objective of this Research Topic is to exploit the new opportunities for future wireless networks provided by the recent advancement in DD domain signal processing, and to bring this promising vision closer to reality. In particular, this Research Topic will cover various theoretical and practical design issues in DD domain communications and radar sensing, aiming at bringing together researchers, industry practitioners, and individuals working in related areas to share their new ideas, latest findings, and state-of-the-art results.

This Research Topic will provide a comprehensive overview of the state-of-the-art DD domain technology and theory, highlighting its distinct features in comparison to the conventional TF domain designs. It will provide a forum for the latest research, innovations, and applications of DD domain communications and radar sensing, which will help to bridge the gap between theory and practice. We solicit high-quality original research and survey papers on topics including, but not limited to:

Fundamental limits for DD domain communications and radar sensing
DD domain channel estimation, signal detection, and transceiver designs
DD domain MIMO and massive MIMO designs
DD domain orthogonal and non-orthogonal multiple access designs
DD domain communications for URLLC
Channel coding for DD domain communications
Waveform designs for DD domain radar sensing
Coexistence of communication and radar waveforms in the DD domain
DD domain integrated sensing and communications (ISAC)
Machine learning/AI enhanced DD domain communications and radar sensing
Security and privacy issues in DD domain
Intelligent reflecting surface (IRS) -assisted DD domain communications and radar sensing
DD domain communications and radar sensing in mmWave and Tera Hertz frequency bands
Channel measurement and modeling in the DD domain
System-level simulation, prototyping, and field-tests for DD domain communications and radar sensing

Keywords: Delay-Doppler domain communications, delay-Doppler domain radar sensing, delay-Doppler domain signal processing, integrated sensing and communications, orthogonal time frequency space, detection and estimation


Important Note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.

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