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Adaptive Orthogonal Basis Scheme for OTFS

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Communications and Networking (ChinaCom 2022)


Orthogonal time frequency space (OTFS) modulation can provide significant error performance than orthogonal frequency division multiplexing (OFDM) modulation in the high-speed scenario. However, the fractional Doppler effects cause Doppler diffusion. In this paper, we analyze the Doppler diffusion from both the formula and geometric levels. In order to alleviate Doppler diffusion, we propose an adaptive orthogonal basis scheme by using the Doppler shifts feedback of the receiver. Our scheme alter the matrix of the inverse symplectic finite Fourier transform (ISFFT) by the feedback. This scheme makes it possible to estimate the channel more accurately. In the simulation results, we show that the bit error rate (BER) and block error rate (BLER) performance of our proposed scheme is not affected compared with OTFS. In addition, our scheme can work even if the Doppler domain dimension is limited and the Doppler shifts feedback of the receiver is inaccurate.

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This work is supported by National Natural Science Foundation of China (No. 61931005) and Beijing University of Posts and Telecommunications-China Mobile Research Institute Joint Innovation Center.

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Correspondence to Yinhua Jia .

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© 2023 ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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Jia, Y., Wang, S., Jin, J., Long, H. (2023). Adaptive Orthogonal Basis Scheme for OTFS. In: Gao, F., Wu, J., Li, Y., Gao, H. (eds) Communications and Networking. ChinaCom 2022. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 500. Springer, Cham.

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  • Print ISBN: 978-3-031-34789-4

  • Online ISBN: 978-3-031-34790-0

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