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The normalized mean square error is an important parameter to evaluate the channel estimation and reconstruction error. As the SNR increases, the gap between the channel estimation error and channel tracking error increases. This is because as the SNR increases, the channel estimation becomes more and more accurate. Also, as the gamma increases, gamma was the constant to determines the threshold, the channel reconstruction error increases because more fluctuations are allowed during the channel tracking. The best result, negative 10dB NMSE, has been obtained for 90 measurements at 15dB SNR and gamma of 1.
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IEEE/ICACT20210129 Slide.12
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