Grid Evolution for Doubly Fractional Channel Estimation in OTFS Systems
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866913519473000448 |
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| author | Li, Xiangjun Fan, Pingzhi Wang, Qianli Liu, Zilong |
| author_facet | Li, Xiangjun Fan, Pingzhi Wang, Qianli Liu, Zilong |
| contents | In orthogonal time-frequency space communications, the performances of existing on-grid and off-grid channel estimation (CE) schemes are determined by the delay-Doppler (DD) grid density. In practice, multiple real-life DD channel responses might be co-located within a same DD grid interval, leading to performance degradation. A finer grid interval is needed to distinguish these responses, but this could result in a significantly higher CE complexity when traditional methods are used.To address this issue, a grid evolution method for doubly fractional CE is proposed by evolving the initially uniform coarse DD grid into a non-uniform dense grid. Simulation results show that our proposed method leads to improved computational efficiency, and achieves a good trade-off between CE performance and complexity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_17584 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Grid Evolution for Doubly Fractional Channel Estimation in OTFS Systems Li, Xiangjun Fan, Pingzhi Wang, Qianli Liu, Zilong Signal Processing In orthogonal time-frequency space communications, the performances of existing on-grid and off-grid channel estimation (CE) schemes are determined by the delay-Doppler (DD) grid density. In practice, multiple real-life DD channel responses might be co-located within a same DD grid interval, leading to performance degradation. A finer grid interval is needed to distinguish these responses, but this could result in a significantly higher CE complexity when traditional methods are used.To address this issue, a grid evolution method for doubly fractional CE is proposed by evolving the initially uniform coarse DD grid into a non-uniform dense grid. Simulation results show that our proposed method leads to improved computational efficiency, and achieves a good trade-off between CE performance and complexity. |
| title | Grid Evolution for Doubly Fractional Channel Estimation in OTFS Systems |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2409.17584 |