Method of differential-phase/absolute-amplitude QAM

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

2007-07-03

2007-07-03

Ha, Dac V. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S350000

Reexamination Certificate

active

10454805

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.

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