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Multi-Functional Chirp Signalling for Next-Generation Multi-Carrier Wireless Networks: Communications, Sensing and ISAC Perspectives
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Multi-Functional Chirp Signalling for Next-Generation Multi-Carrier Wireless Networks: Communications, Sensing and ISAC Perspectives
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To meet the increasingly demanding quality-of-service requirements of the next-generation multi-carrier mobile networks, it is essential to design multi-functional signalling schemes facilitating efficient, flexible, and reliable communication and sensing in complex wireless environments. As a compelling candidate, we advocate chirp signalling, beneficially amalgamating sequences (e.g., Zadoff-Chu sequences) with waveforms (e.g., chirp spread spectrum and frequency-modulated continuous wave (FMCW) radar), given their resilience against doubly selective channels. Besides chirp sequences, a wide range of chirp waveforms is considered, ranging from FMCW to affine frequency-division multiplexing (AFDM), to create a promising chirp multicarrier waveform. This study also highlights the advantages of such waveforms in supporting reliable high-mobility communications, plus integrated sensing and communications (ISAC). Finally, we outline several emerging research directions for chirp signalling designs.
Forward citations
Cited by 12 Pith papers
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A Unified Framework for Ambiguity Function Shaping and PAPR Control in AFDM Systems
Unified AFDM waveform design framework enables ambiguity function shaping via weighted ISL minimization, PAPR control, or joint operation using reserved chirp subcarriers and a JIPD-MM solver.
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ISAC with Affine Frequency Division Multiplexing: An FMCW-Based Signal Processing Perspective
AFDM is made equivalent to FMCW radar through parameter choice, yielding a DD-DAFT input-output model and two pilot-free matched-filter sensing algorithms that trade sensing accuracy against communication overhead and...
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Joint Chirp Parameter Selection and Low-Complexity MMSE Receiver Design for AFDM Systems
A joint chirp-parameter and sparsification-pattern optimization enables a banded-Cholesky MMSE receiver for AFDM with near-full-MMSE BER at O(N d^2) complexity.
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Frame-Based AFDM-ISAC Waveform Design With Chirp-Enabled Pulse Compression
Proposes AFDM-ISAC waveform with chirp subcarrier frame structure, analog chirp-compression receiver, and GCE-BEM-based channel estimation for integrated sensing and communications.
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MIMO-AFDM Outperforms MIMO-OFDM in the Face of Hardware Impairments
MIMO-AFDM is claimed to keep full diversity and outperform MIMO-OFDM under hardware impairments, but the noise treatment and the paper's own error floors weaken the claim.
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ISAC with Affine Frequency Division Multiplexing: An FMCW-Based Signal Processing Perspective
With the parameter choice c1 = 1/(2Np), c2 = 0, AFDM subcarriers are mathematically identical to Nyquist-sampled FMCW chirps, so every DAFT index maps to a delay-Doppler coordinate, enabling FMCW-style single-symbol r...
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DAFT-s-AFDM Enabled ISAC Systems: Ambiguity Function Analysis and Waveform Design
DAFT-s-AFDM with probabilistic constellation shaping achieves a superior controllable tradeoff between communication and sensing ambiguity function performance in ISAC systems.
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Error Rate Analysis and Low-Complexity Receiver Design for Zero-Padded AFDM
Introduces low-complexity MMSE and MRC-TD detectors for ZP-AFDM exploiting lower-triangular channel structure, with theoretical BER analysis and simulations showing equivalent performance to full MMSE at reduced cost.
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Adaptive $c_2$-Perturbed AFDM Waveform Design for Integrated Sensing and Communication
An adaptive optimization of the c2 parameter in AFDM reduces PAPR and weighted sidelobe levels using a spectral projected-gradient algorithm for improved ISAC performance.
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AFDM: Evolving OFDM Towards 6G+
AFDM is presented as an OFDM-backward-compatible 6G+ waveform whose added transceiver cost is two O(N) chirp rotations, supported by a generalized pulse-shaped FDFD channel formulation.
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Artificial Intelligence for Spatially Reconfigurable Antennas: Movable, Fluid, and Pinching Antenna Systems
A cross-architecture survey that organizes AI methods for movable, fluid, and pinching antennas by the joint optimization problem they solve.
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Towards Standardizing Affine Frequency Division Multiplexing (AFDM) for Future Wireless Networks
AFDM is analyzed for standardization potential, showing backwards compatibility with 4G/5G, radar, and LoRa systems while highlighting robustness in delay-Doppler channels for NTN, ISAC, V2X, and UWA applications.
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