Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Patent
1998-03-26
2000-08-01
Tse, Young T.
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
375261, 371 431, H03M 1312
Patent
active
060977647
ABSTRACT:
A digital communication system (20) communicates using a polar amplitude phase shift keyed (P-APSK) phase point constellation (70, 70', 70"). Pragmatic encoding is accommodated using the constellation (70, 70', 70") to simultaneously communicate both encoded and uncoded information bits (69, 51). The constellation (70, 70', 70") has an even number of phase point rings (74) and equal numbers of phase points (72) in ring pairs (75, 76, 77). Encoded information bits (69) specify secondary modulation and uncoded information bits (51) specify primary modulation. The constellation (70, 70', 70") is configured so secondary sub-constellations (78) include four phase points (72) arranged so that two of the four phase points (72) exhibit two phase angles at one magnitude and the other two of the four phase points (72) exhibit phase angles that are at another magnitude. The difference between the phase angles at different magnitudes within a secondary sub-constellation (78) is constant.
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Cochran Bruce A.
Liebetreu John M.
McCallister Ronald D.
Gresham Lowell W.
Meschkow Jordan M.
SiCOM, Inc.
Tse Young T.
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