Rethink Delay Doppler Channels and Time-Frequency Coding
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866909556720795648 |
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| author | Xia, Xiang-Gen |
| author_facet | Xia, Xiang-Gen |
| contents | In this paper, we rethink delay Doppler channels (also called doubly selective channels). We prove that no modulation schemes (including the current active VOFDM/OTFS) can compensate a non-trivial Doppler spread well. We then discuss some of the existing methods to deal with time-varying channels, in particular time-frequency (TF) coding in an OFDM system. TF coding is equivalent to space-time coding in the math part. We also summarize state of the art on space-time coding that was an active research topic over a decade ago. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_00641 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Rethink Delay Doppler Channels and Time-Frequency Coding Xia, Xiang-Gen Signal Processing Information Theory In this paper, we rethink delay Doppler channels (also called doubly selective channels). We prove that no modulation schemes (including the current active VOFDM/OTFS) can compensate a non-trivial Doppler spread well. We then discuss some of the existing methods to deal with time-varying channels, in particular time-frequency (TF) coding in an OFDM system. TF coding is equivalent to space-time coding in the math part. We also summarize state of the art on space-time coding that was an active research topic over a decade ago. |
| title | Rethink Delay Doppler Channels and Time-Frequency Coding |
| topic | Signal Processing Information Theory |
| url | https://arxiv.org/abs/2501.00641 |