Method of selecting a PCM modem signal constellation in...

Details Method of selecting a PCM modem signal constellation in... Method of selecting a PCM modem signal constellation in...

2006-04-18

2006-04-18

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Transmitters

C375S224000

Reexamination Certificate

active

07031400

ABSTRACT:
Disclosed are methods of selecting a multi-dimensional signal constellation in relation to impairments in a communication system having a data frame consisting of a fixed number of symbols. The methods make use of impairments detected from a Digital Impairment Learning sequence (DIL) and channel impairments, such as POE and SNR. Signal points are individually assigned to each symbol in a data frame in relation to that symbol's particular digital impairments and a pre-selected minimum performance level and maximum power constraints.

REFERENCES:
patent: 6256357 (2001-07-01), Oshima
patent: 6332009 (2001-12-01), Olafsson
patent: 6553535 (2003-04-01), Asada et al.
patent: 6661847 (2003-12-01), Davis et al.
patent: 6721357 (2004-04-01), Zhang et al.
patent: 6785326 (2004-08-01), Tan
patent: 2001/0038673 (2001-11-01), Olafsson

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