Analytical study of intercarrier interference in chirp-based AFDM system
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Mohit Kumar Singh
Abstract
Affine Frequency Division Multiplexing (AFDM) has emerged as a robust modulation scheme capable of handling the challenges posed by doubly dispersive wireless channels. By utilizing chirp-based waveforms, AFDM offers inherent resilience against time and frequency dispersion, positioning it as a potential alternative to Orthogonal Frequency Division Multiplexing (OFDM), especially in high-mobility environments. However, like OFDM, AFDM is still susceptible to Intercarrier Interference (ICI), particularly in the presence of Carrier Frequency Offset (CFO). In this work, I derive analytical expressions for the ICI coefficients and the resulting Carrier-to-Interference Ratio (CIR) in AFDM. To understand the impact of ICI, I evaluate the Bit Error Rate (BER) performance of AFDM under both Additive White Gaussian Noise (AWGN) and Rayleigh fading channels. Simulations results compare the BER performance of AFDM with and without ICI, clearly highlighting the performance degradation due to ICI.
Acknowledgments
ChatGPT was used for refining the language and grammar of the manuscript. AI tools are not used in designing or methodology.
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Research ethics: This study did not involve any experiments with human participants or animals and thus did not require ethical approval.
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Informed consent: Not applicable.
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Author contributions: The author has accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: ChatGPT was used for refining the language and grammar of the manuscript. AI tools are not used in designing or methodology.
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Conflict of interest: The author states no conflict of interest.
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Research funding: None declared.
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Data availability: Not applicable.
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