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In OTFS communication system, the time delay affects the DD domain channel. Therefore, we consider the signal arrival time (ョ) from user to BS in vehicular communication scenarios. In the simulation, We set the vehicle speed to 80 km/h uniformly. Fig. 8 depicts the effect of ョ on the NMSE performance at different SNR. It is found that the NMSE performance gradually improves when ョ increases at the same SNR. Since the higher delay can improve the delay resolution in the DD domain, thus making channel state characteristics better. Meanwhile, the NMSE performance of the DCNN method does not varies significantly when ョ changes from 0.25s to 1s, which proves that the DCNN method has good robustness under different ョ and has better channel estimation stability in different vehicular communication scenarios. |
IEEE/ICACT20230246 Slide.17
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