A Low-Complexity Radar System Based on Affine Frequency Division Multiplexing Modulation

Affine frequency division multiplexing (AFDM) is a recently proposed communication waveform for time-varying channel scenarios. As a chirp-based multicarrier modulation technique, by adjusting the built-in parameters of this waveform, it can not only adapt to the needs of multiple scenarios in futur...

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Bibliographic Details
Published in:arXiv.org 2023-12
Main Authors: Zhu, Jiajun, Tang, Yanqun, Wei, Xizhang, Yin, Haoran, Du, Jinming, Wang, Zhengpeng, Liu, Yuqinng
Format: Article
Language:English
Subjects:
Algorithms
Ambiguity
Bit error rate
Communication
Communication networks
Complexity
Error detection
Frequency division multiplexing
Modulation
Parameters
Radar equipment
Radar systems
Waveforms
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Summary:Affine frequency division multiplexing (AFDM) is a recently proposed communication waveform for time-varying channel scenarios. As a chirp-based multicarrier modulation technique, by adjusting the built-in parameters of this waveform, it can not only adapt to the needs of multiple scenarios in future mobile communication networks but also achieve good performance in radar sensing, making it a promising air interface waveform in integrated sensing and communication (ISAC) applications. In this paper, we investigate an AFDM-based radar system and analyze the radar ambiguity function of AFDM with different built-in parameters, based on which we find an AFDM waveform with the specific \(c_2\) owns the near-optimal time-domain ambiguity function. Then a low-complexity algorithm based on matched filtering for high-precision target range estimation is proposed for this specific AFDM waveform. Through simulation and analysis, the specific AFDM waveform has near-optimal range estimation performance with the proposed low-complexity algorithm while having the same bit error rate (BER) performance as orthogonal time frequency space (OTFS) under the practical linear minimum mean square error (LMMSE) detector.
ISSN:2331-8422