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This paper investigates Tsunami modeling, waveform reconstruction and parameter estimation using noisy sea surface height measurements observed by a satellite-carried global navigation satellite system (GNSS) sensor. Wavelet theory is used to mitigate the strong measurement noise. Tsunami modeling is considered and Cramer–Rao lower bound is derived for estimation of Tsunami shape parameters, wave height and wavelength. Real Tsunami data observed by altimetry satellites are used for performance evaluation and the results demonstrate the efficiency of the proposed approach. [ABSTRACT FROM AUTHOR]

5G systems are becoming a reality and the evolution toward beyond 5G and 6G systems is already being defined, also to cope with the ever increasing capacity demanded by on-ground users. This will pose challenging requirements on the feeder link of future satellite systems, which risks to become a bottleneck for the overall system performance. In this article, we propose a novel architecture of linear precoding for the feeder link of a broadcast satellite system operating with full frequency reuse to significantly enhance the achievable capacity. The architecture has been simulated and tested in a challenging multifrequency scenario, where Ku, Ka, Q/V, and W bands have been considered for transmission. The numerical performance analysis and the open issues related to the practical realization of the proposed architecture are also thoroughly discussed. [ABSTRACT FROM AUTHOR]