On the Robustness of AFDM and OTFS Against Passive Eavesdroppers
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908606032510976 |
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| author | Savaux, Vincent Rou, Hyeon Seok Sui, Zeping de Abreu, Giuseppe Thadeu Freitas Liu, Zilong |
| author_facet | Savaux, Vincent Rou, Hyeon Seok Sui, Zeping de Abreu, Giuseppe Thadeu Freitas Liu, Zilong |
| contents | We investigate the robustness of affine frequency division multiplexing (AFDM) and orthogonal time frequency space (OTFS) waveforms against passive eavesdroppers performing brute-force demodulation to intercepted signals, under the assumption that eavesdroppers have no knowledge of chirp parameters (in AFDM) or the delay-Doppler grid configuration (in OTFS), such that they must search exhaustively over possible demodulation matrices. Analytical results show that the brute-force complexity scales as $\mathcal{O}(\sqrt{N})$ for OTFS and $\mathcal{O}(N^2)$ for AFDM, where $N$ is the number of subcarriers, indicating that AFDM has superior resilience over OTFS. Bit error rate (BER) simulations confirm the analysis by showing that, with AFDM, the signal remains nearly undecodable at the eavesdropper, while OTFS allows partial signal recovery under equivalent conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_19525 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On the Robustness of AFDM and OTFS Against Passive Eavesdroppers Savaux, Vincent Rou, Hyeon Seok Sui, Zeping de Abreu, Giuseppe Thadeu Freitas Liu, Zilong Signal Processing We investigate the robustness of affine frequency division multiplexing (AFDM) and orthogonal time frequency space (OTFS) waveforms against passive eavesdroppers performing brute-force demodulation to intercepted signals, under the assumption that eavesdroppers have no knowledge of chirp parameters (in AFDM) or the delay-Doppler grid configuration (in OTFS), such that they must search exhaustively over possible demodulation matrices. Analytical results show that the brute-force complexity scales as $\mathcal{O}(\sqrt{N})$ for OTFS and $\mathcal{O}(N^2)$ for AFDM, where $N$ is the number of subcarriers, indicating that AFDM has superior resilience over OTFS. Bit error rate (BER) simulations confirm the analysis by showing that, with AFDM, the signal remains nearly undecodable at the eavesdropper, while OTFS allows partial signal recovery under equivalent conditions. |
| title | On the Robustness of AFDM and OTFS Against Passive Eavesdroppers |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2510.19525 |