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In the new digital video broadcasting standard for satellite communications (DVB-S2), 16-ary amplitude-phase shift keying (APSK) is recommended as modulation scheme, together with 2/4/8-PSK and 32-APSK as alternatives. For carrier phase recovery with feedback loops, decision-directed (DD) and non- data aided (NDA) detector algorithms are basically applicable to 16-APSK schemes. In a recent paper, however, a hybrid NDA/DD solution has been suggested although not analyzed in detail. Motivated by this fact, the latter is to be investigated in terms of open-loop detector characteristic (S-curve) and jitter variance as the main figures of merit in this respect, but with an additional design parameter introduced for optimization purposes. On the other hand, for comparison reasons, results of power-law and monomial-based Viterbi and Viterbi trackers, as classical NDA solutions, are considered as well.
Date of Conference: 13-14 Sept. 2007