Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Reexamination Certificate
2006-10-17
2006-10-17
Fan, Chieh (Department: 2631)
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
C375S308000
Reexamination Certificate
active
07123663
ABSTRACT:
A new class of 16-ary Amplitude and Phase Shift Keying (APSK) coded modulations, called double-ring APSK modulation, based on an amplitude and phase shift keying constellation in which the locations of the digital signals to be encoded are placed on two concentric rings of equally spaced signal points. The APSK constellation parameters are optimised so as to pre-compensate the impact of non-linearities. The new modulation scheme is suited for being used with different coding schemes. It is shown that, for the same coding scheme, pre-distorted double-ring APSK modulation significantly outperforms classical 16-QAM and 16-PSK over a typical satellite channel, due to its intrinsic robustness against the high power amplifier non-linear characteristics. The proposed coded modulation scheme is shown to provide a considerable performance advantage for future satellite multi-media and broadcasting systems.
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De Gaudenzi Ricardo
Guillen i Fabregas Alberto
Martinez Vicente Alfonso
Ponticelli Beatrice
Agence Spatiale Europeenne
Ejaz Naheed
Fan Chieh
Lipsitz & McAllister LLC
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