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In this study, we addressed the practical problem of simultaneously satisfying both band-edge attenuation and EVM performance for NB-IoT gNB in the 3GPP NTN scenario A. Firstly, we are following 3GPP specification to generate standard NB-IoT gNB signal to compatible with real system implementation. Secondly, we used two-stage IFIR filtering approach to investigate whether a favourable tradeoff exists between the attenuation (C1) and EVM (C2) criteria. Finally, after designing and simulating numerous candidate IFIR filters, we selected IFIR#2 with an optimized 128-tap prototype filter as the final design, which not only can meet strict spectral band-edge attenuation for NTN but also maintain network operator requirements for link performance, Hence, we conclude that the proposed for the two-stage IFIR filter can successfully satisfy all the criteria and can implementation at standard NB-IoT system, Therefore, this study is a promising candidate for practical applications in NB-IoT over NTN.
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IEEE/ICACT20230155 Slide.14
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