Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Engineering
Modulation Identification And Carrier Recovery System For Adaptive Modulation In Satellite Communications, Kenta Umebayashi, Robert H. Morelos-Zaragoza, Ryuji Kohno
Modulation Identification And Carrier Recovery System For Adaptive Modulation In Satellite Communications, Kenta Umebayashi, Robert H. Morelos-Zaragoza, Ryuji Kohno
Faculty Publications
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.
A Method Of Non-Data-Aided Carrier Recovery With Modulation Identification, Robert H. Morelos-Zaragoza, Kenta Umebayashi, Ryuji Kohno
A Method Of Non-Data-Aided Carrier Recovery With Modulation Identification, Robert H. Morelos-Zaragoza, Kenta Umebayashi, Ryuji Kohno
Faculty Publications
A non-data aided carrier recovery technique using modulation format identification is proposed. This technique can also be interpreted as a modulation identification method that is robust against static phase and frequency offsets. The performance of the proposed technique is studied and analytical expressions derived for the mean acquisition time to detect lock in the cases of M-PSK, M=2,4,8, and 16-QAM modulation, with respect to frequency offset and signal-to-noise ratio. The results are verified with Monte Carlo simulations. The main advantage of the proposed method lies in its simpler implementation and faster lock detection, when compared to conventional methods.