We introduce the modulation identification technique implementing the multimode phase locked loop (PLL) in the satellite communication using adaptive modulation scheme which is a countermeasure against the rain attenuation. In the multimode PLL, phase lock detectors (PLDs) are used for not only phase lock, but also modulation identification. We present the sub-optimized design of the PLDs for modulation identification with respect to the throughput and show the validity of sub-optimization. In addition, by the comparison between the multimode PLL and conventional scheme in ISDB-S, we present the effectivity of the multimode PLL.
Kenta Umebayashi, Robert H. Morelos-Zaragoza, and Ryuji Kohno. "Modulation Identification and Carrier Recovery System for Adaptive Modulation in Satellite Communications" Faculty Publications (2005). doi:10.1109/VETECS.2005.1543825