Delay-Doppler Domain Pulse Design for OTFS-NOMA
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910462889689088 |
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| author | Kulhandjian, Michel Kulhandjian, Hovannes Kurt, Gunes Karabulut Yanikomeroglu, Halim |
| author_facet | Kulhandjian, Michel Kulhandjian, Hovannes Kurt, Gunes Karabulut Yanikomeroglu, Halim |
| contents | We address the challenge of developing an orthogonal time-frequency space (OTFS)-based non-orthogonal multiple access (NOMA) system where each user is modulated using orthogonal pulses in the delay Doppler domain. Building upon the concept of the sufficient (bi)orthogonality train-pulse [1], we extend this idea by introducing Hermite functions, known for their orthogonality properties. Simulation results demonstrate that our proposed Hermite functions outperform the traditional OTFS-NOMA schemes, including power-domain (PDM) NOMA and code-domain (CDM) NOMA, in terms of bit error rate (BER) over a high-mobility channel. The algorithm's complexity is minimal, primarily involving the demodulation of OTFS. The spectrum efficiency of Hermite-based OTFS-NOMA is K times that of OTFS-CDM-NOMA scheme, where K is the spreading length of the NOMA waveform. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_19182 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Delay-Doppler Domain Pulse Design for OTFS-NOMA Kulhandjian, Michel Kulhandjian, Hovannes Kurt, Gunes Karabulut Yanikomeroglu, Halim Signal Processing Information Theory We address the challenge of developing an orthogonal time-frequency space (OTFS)-based non-orthogonal multiple access (NOMA) system where each user is modulated using orthogonal pulses in the delay Doppler domain. Building upon the concept of the sufficient (bi)orthogonality train-pulse [1], we extend this idea by introducing Hermite functions, known for their orthogonality properties. Simulation results demonstrate that our proposed Hermite functions outperform the traditional OTFS-NOMA schemes, including power-domain (PDM) NOMA and code-domain (CDM) NOMA, in terms of bit error rate (BER) over a high-mobility channel. The algorithm's complexity is minimal, primarily involving the demodulation of OTFS. The spectrum efficiency of Hermite-based OTFS-NOMA is K times that of OTFS-CDM-NOMA scheme, where K is the spreading length of the NOMA waveform. |
| title | Delay-Doppler Domain Pulse Design for OTFS-NOMA |
| topic | Signal Processing Information Theory |
| url | https://arxiv.org/abs/2405.19182 |