Research Article
Chirp Optimization for Affine Frequency Division Multiplexing PAPR Reduction
@INPROCEEDINGS{10.1007/978-3-032-33662-0_2, author={Liang Sun and Xin Yang and Wen-Bin Sun and Qian Xu and Lili Chen and Yanyun Gong and Jia Su}, title={Chirp Optimization for Affine Frequency Division Multiplexing PAPR Reduction}, proceedings={Communications and Networking. 20th EAI International Conference, ChinaCom 2025, Xi’an, China, November 8--9, 2025, Proceedings}, proceedings_a={CHINACOM}, year={2026}, month={10}, keywords={Affine frequency division multiplexing (AFDM) Orthogonal Frequency Division Multiplexing (OFDM) peak-to-average power ratio (PAPR) complementary cumulative distribution function (CCDF)}, doi={10.1007/978-3-032-33662-0_2} }- Liang Sun
Xin Yang
Wen-Bin Sun
Qian Xu
Lili Chen
Yanyun Gong
Jia Su
Year: 2026
Chirp Optimization for Affine Frequency Division Multiplexing PAPR Reduction
CHINACOM
Springer
DOI: 10.1007/978-3-032-33662-0_2
Abstract
As a state-of-the-art modulation waveform, Affine Frequency Division Multiplexing (AFDM) demonstrates significant potential and application prospects in high-mobility communication scenarios compared to Orthogonal Frequency Division Multiplexing (OFDM). AFDM is a multicarrier modulation based on chirp signals, distinguished primarily by two tunable parameters: the pre-chirp parameter and the post-chirp parameter. These adjustable parameters enable the waveform to better adapt to Doppler spread in doubly dispersive channels. However, due to the randomness of modulated symbols, AFDM suffers from a critical drawback: the high peak-to-average power ratio (PAPR), which imposes stringent linearity and power requirements on transmitters in practical applications. To address this issue, we leverage the tunable pre-chirp parameter. We first prove that this parameter has no effect on the average power of modulated symbols. Subsequently, we optimize its frame-wise parameter values using a hybrid particle swarm optimization approach. Finally, we present a comparative analysis of the optimized system bit error rate (BER) and the complementary cumulative distribution function (CCDF) of PAPR with other modulation waveforms and other two PAPR reduction methods.