This paper presents a thorough analysis of the spectral characteristics of space telemetry signals when randomizers are used to counter the power excess, that is, the increase of the power spectrum in some measurement bandwidths with respect to the transmission of an ideal random signal. We show that a long randomizer actually improves the spectral characteristics but is not able to solve some critical problems appearing when all-zero frames or almost constant data are transmitted. Suitable solutions are proposed to face these cases, ensuring a small power excess in all possible operation conditions. The impact of high-order modulations and error correcting codes is also investigated.
Effect of randomizers on the power spectrum excess of space telemetry signals / Battaglioni, Massimo; Baldi, Marco; Chiaraluce, Franco; Garello, Roberto; Vassallo, Enrico; Paolo Calzolari, Gian. - In: INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING. - ISSN 1542-0981. - ELETTRONICO. - 40:2(2021), pp. 67-82. [10.1002/sat.1416]