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

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S350000, C375S261000, C375S326000, C375S298000, C375S324000

Reexamination Certificate

active

10454804

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: 4209843 (1980-06-01), Hyatt
patent: 4553213 (1985-11-01), Hyatt
patent: 5621762 (1997-04-01), Miller et al.
patent: 5640417 (1997-06-01), Barabash et al.
patent: 5748783 (1998-05-01), Rhoads
patent: 6055268 (2000-04-01), Timm et al.
patent: 6188788 (2001-02-01), Renner et al.
patent: 6704353 (2004-03-01), McCarty et al.

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