M-ary signal constellations suitable for non-linear...

Details M-ary signal constellations suitable for non-linear... M-ary signal constellations suitable for non-linear...

2006-05-02

2006-05-02

Tran, Khanh C. (Department: 2631)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C375S297000

Reexamination Certificate

active

07039126

ABSTRACT:
A communications system (10) which utilizes an M-ary QAM signal constellation suitable for non-linear applications. The communications system includes a modulator (18) for utilizing the M-ary constellation to implement the modulation. The M-ary constellation is a circular constellation which provides a simplified amplitude predistortion by utilizing the subject M-ary constellations, enabling more efficient communications can then be achieved through a peak-power-limited non-linear channel (16). Such non-linear channels (16) are more power efficient at creating RF energy from DC energy.

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C. Melvil Thomas, et al. “Digital amplitude-Phase Keying with M-ary Alphabets,” IEEE Transactions on Communications, vol. Com-22, No. 2, Feb. 1974.

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