Symbol decision adjustment in demodulator

Details Symbol decision adjustment in demodulator Symbol decision adjustment in demodulator

2008-01-29

2008-01-29

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S264000

Reexamination Certificate

active

07324611

ABSTRACT:
Methods and apparatus for use in making improved symbol decisions in a demodulator in the presence of distortion in the received signaling. In one implementation, a method includes the steps of: determining a centroid symbol location for a received symbol of a constellation, the centroid symbol location different than an ideal symbol location due to distortion of the received symbol; and adjusting a decision line bounding the received symbol based on the centroid symbol location. In preferred embodiments, the method is implemented in a satellite communication system, which the distortion is a nonlinear distortion and is caused by a high power amplifier at the transmitting terminal and in which bandwidth efficient modulation formats are used to transmit data at a high rate. In some embodiments, centroid symbol locations are used to improve soft decision decoding.

REFERENCES:
patent: 4866395 (1989-09-01), Hostetter
patent: 6292126 (2001-09-01), Chelehmal et al.
patent: 7197090 (2007-03-01), Berger et al.
patent: 2001/0010709 (2001-08-01), Iwamatsu et al.
patent: 2002/0054649 (2002-05-01), Kokuryo et al.
patent: 2003/0039318 (2003-02-01), Tong et al.
patent: 2003/0112891 (2003-06-01), Ozaki
patent: 2005/0220220 (2005-10-01), Belotserkovsky

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