Research Article
Adaptive Orthogonal Basis Scheme for OTFS
@INPROCEEDINGS{10.1007/978-3-031-34790-0_5, author={Yinhua Jia and Sen Wang and Jing Jin and Hang Long}, title={Adaptive Orthogonal Basis Scheme for OTFS}, proceedings={Communications and Networking. 17th EAI International Conference, Chinacom 2022, Virtual Event, November 19-20, 2022, Proceedings}, proceedings_a={CHINACOM}, year={2023}, month={6}, keywords={OTFS delay-Doppler channel fractional Doppler effect}, doi={10.1007/978-3-031-34790-0_5} }- Yinhua Jia
Sen Wang
Jing Jin
Hang Long
Year: 2023
Adaptive Orthogonal Basis Scheme for OTFS
CHINACOM
Springer
DOI: 10.1007/978-3-031-34790-0_5
Abstract
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.
