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In Fig. 7, we investigate the NMSE performance of the proposed EDRSN scheme under different Rician factors at SNR = 5 dB. The values of the Rician factor リ affect the degree of frequency selective fading, which in turn influences the channel state. We can observe that LS and SLS estimation schemes are not affected by the variation of Rician factor リ. This is because LS and SLS scheme are appropriate for arbitrary frequency-selective fading channels. In addition, since the EDRSN model is trained at リ = 10 dB, it is seen that the NMSE performance of the EDRSN scheme degrades with リ < 10 dB, due to the fact that the channel state of RIS-BS link becomes worse with small リ. However, the proposed scheme still outperforms the LS and SLS schemes and its estimation accuracy becomes better as リ increases. Therefore, when the channel state changes, the proposed EDRSN scheme can still estimate the channel matrix with high accuracy. |
IEEE/ICACT20230157 Slide.15
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