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arXiv · 2212.09280

Superimposed Channel Estimation in OTFS Modulation Using Compressive Sensing

Omid Abbassi Aghda·Mohammad Javad Omidi·Hamid Saeedi-Sourck
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Abstract

Orthogonal time frequency space (OTFS) technique is a two-dimensional modulation method that multiplexes information symbols in the delay-Doppler (DD) domain. OTFS combats high Doppler shift existing in high speed wireless communication. However, conventional channel estimation in OTFS suffers from high pilot overhead because guard symbols occupy a significant part of the DD domain grids. In this paper, a superimposed channel estimation is proposed which can completely estimate channel parameters without considering pilot overhead and performance degradation. As the channel state information (CSI) in the DD domain is sparse, a sparse recovery algorithm orthogonal matching pursuit (OMP) is used. Besides, our proposed method does not suffer from high peak to average power ratio (PAPR). To detect information symbols, a message passing (MP) detector, which exploits the sparsity of DD channel representation, is employed.

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Omid Abbassi Aghda, Mohammad Javad Omidi, Hamid Saeedi-Sourck. 2022-12-19. Superimposed Channel Estimation in OTFS Modulation Using Compressive Sensing. https://doi.org/10.1109/icee59167.2023.10334727

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