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How does OTFS better than OFDM? 


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OTFS is better than OFDM because it is robust to channel-induced Doppler shift in high mobility wireless communication systems . OTFS modulation is able to overcome the challenges faced by OFDM in high Doppler environments . OTFS has better bit error rate (BER) performance compared to OFDM under high-mobility conditions . OTFS-DM-IM, a transmission scheme based on OTFS, provides a balance between transmission reliability and spectral efficiency . OTFS-SCMA, a multi-user OTFS system based on sparse code multiple access (SCMA), offers significant diversity gain over other multiple access systems for OTFS . OTFS-SCMA outperforms existing OTFS-OMA, OFDM-SCMA, and OTFS-PD-NOMA techniques . OTFS-based RIS-assisted SAGIN systems outperform their OFDM counterparts and exhibit excellent performance across a wide range of SAGIN channel parameters . OTFS, with an appropriate mobility mode, can significantly outperform OFDM with linear equalizers .

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OTFS is better than OFDM in high Doppler environments because it overcomes the challenges faced by OFDM.
OTFS is better than OFDM because it is inherently robust to channel-induced Doppler shift, allowing for joint equalization of all information symbols in the delay-Doppler domain.
OTFS has better bit error rate (BER) performance than OFDM under high-mobility conditions, as stated in the abstract of the paper.
OTFS is better than OFDM in RIS-assisted SAGIN systems because it mitigates the error floors caused by doubly selective fading in the time-frequency domain and exhibits excellent performance across various SAGIN channel parameters.

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