Design of OTFS Signals with Pulse Shaping and Window Function for OTFS-Based Radar
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| Format: | Preprint |
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2025
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| _version_ | 1866913877801828352 |
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| author | Sun, Liangchen Jitsumatsu, Yutaka |
| author_facet | Sun, Liangchen Jitsumatsu, Yutaka |
| contents | We propose a pulse radar system that employs a generalized window function derived from the root raised cosine (RRC), which relaxes the conventional constraint that the window values are within the range [0, 1]. The proposed window allows both negative values and values exceeding 1, enabling greater flexibility in signal design. The system transmits orthogonal time frequency space (OTFS) signals intermittently, establishing a flexible input-output relationship that captures both fractional delays and Doppler shifts. By combining the generalized RRC window with a rectangular pulse, the resulting pilot signal achieves a sharp concentration in the ambiguity function over both the delay and Doppler domains. To enhance the estimation accuracy of fractional parameters, we apply frequency-domain interpolation based on the autocorrelation of the RRC window, which outperforms conventional linear interpolation by preserving the signal structure more effectively. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_04861 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Design of OTFS Signals with Pulse Shaping and Window Function for OTFS-Based Radar Sun, Liangchen Jitsumatsu, Yutaka Signal Processing We propose a pulse radar system that employs a generalized window function derived from the root raised cosine (RRC), which relaxes the conventional constraint that the window values are within the range [0, 1]. The proposed window allows both negative values and values exceeding 1, enabling greater flexibility in signal design. The system transmits orthogonal time frequency space (OTFS) signals intermittently, establishing a flexible input-output relationship that captures both fractional delays and Doppler shifts. By combining the generalized RRC window with a rectangular pulse, the resulting pilot signal achieves a sharp concentration in the ambiguity function over both the delay and Doppler domains. To enhance the estimation accuracy of fractional parameters, we apply frequency-domain interpolation based on the autocorrelation of the RRC window, which outperforms conventional linear interpolation by preserving the signal structure more effectively. |
| title | Design of OTFS Signals with Pulse Shaping and Window Function for OTFS-Based Radar |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2506.04861 |