Wilfried Gappmair

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—Signal-to-noise ratio (SNR) estimation for linearly modulated signals is addressed in this letter, focusing on envelope-based estimators, which are robust to carrier offsets and phase jitter, and on the challenging case of nonconstant modulus constellations. For comparison purposes, the true Cramér-Rao lower bound is numerically evaluated, obtaining an(More)
—Signal processing in satellite applications is usually performed either on-ground or on-board, i.e. at the gateway station or in the payload. Within the framework of the European Space Agency (ESA) SatNEx III study, a hybrid approach has been considered by splitting the processing between the satellite and the gateway, aiming to strike a better balance(More)
—We consider the problem of joint non-data-aided (NDA) estimation of carrier frequency and phase offsets, and the signal and noise powers, from the baud-rate samples of a linearly modulated signal in Gaussian noise. The Cramér-Rao lower bound (CRLB) is obtained, showing that, for quadrature-symmetric constellations, the carrier parameters are decoupled from(More)