Method and apparatus for adaptive signaling in a QAM...

Details Method and apparatus for adaptive signaling in a QAM... Method and apparatus for adaptive signaling in a QAM...

2005-06-07

2005-06-07

Ghayour, Mohammed (Department: 2631)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S219000, C375S295000, C375S262000, C375S341000

Reexamination Certificate

active

06904097

ABSTRACT:
A method and apparatus to adaptively puncture bits within QAM modulated data symbols transmitted in a communication system in order to effect a signaling channel. The method and apparatus utilize inherent characteristics of a particular mapping scheme for the QAM constellation to selectively puncture particular bits within a data symbol with signaling information and predetermined binary values to selectively increase the log-likelihood ratio gains of those particular bits punctured with the signaling information. The log-likelihood ratios are used to obtain the signaling information and, thus, increasing the gain of the log-likelihood ratios affords greater reliability for the signaling information without increasing the required system resources.

REFERENCES:
patent: 6084883 (2000-07-01), Norrell et al.

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