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IEEE/ICACT20230246 Slide.09        [Big Slide]       [YouTube]	Oral Presentation
	The OMP algorithm for channel estimation in vehicular OTFS communication system is illustrated in Algorithm 1, where the received signal vector y and the pilot matrix X are set as the input. As we can see, In the t-th iteration, the residual rt-1 of the previous iteration is projected onto each column of X. The index st of the column with the largest absolute product value is selected and added to the current support St and the pilot matrix X is updated. Then the least square (LS) method is employed to obtain the t-th estimated vector Ht in the channel matrix, and the residual rt is updated. Finally, set the iteration number as t = t + 1. Once t > P is satisfied, the iteration is stopped and the newly obtained Ht is the final estimation result HOMP, otherwise the above OMP algorithm operates continuously.

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