Method of differential-phase/absolute-amplitude QAM

Details Method of differential-phase/absolute-amplitude QAM Method of differential-phase/absolute-amplitude QAM

2006-11-15

2008-10-21

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S232000

Reexamination Certificate

active

07440527

ABSTRACT:
A method of quadrature amplitude modulation involving encoding phase differentially and amplitude absolutely, allowing for a high data rate and spectral efficiency in data transmission and other communication applications, and allowing for amplitude scaling to facilitate data recovery; amplitude scale tracking to track-out rapid and severe scale variations and facilitate successful demodulation and data retrieval; 2Npower carrier recovery; incoherent demodulation where coherent carrier recovery is not possible or practical due to signal degradation; coherent demodulation; multipath equalization to equalize frequency dependent multipath; and demodulation filtering.

REFERENCES:
patent: 5272723 (1993-12-01), Kimoto et al.
patent: 5504780 (1996-04-01), Alspector et al.

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