Gray encoding for hierarchical QAM transmission systems

Details Gray encoding for hierarchical QAM transmission systems Gray encoding for hierarchical QAM transmission systems

2006-07-18

2006-07-18

Tran, Khai (Department: 2637)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S298000

Reexamination Certificate

active

07079585

ABSTRACT:
A hierarchical QAM system allows the transmission of different sources by embedding the relative constellation points. At the transmitter the constellations generated by the different sources are remapped by a grey coder and then combined. At the receiver, the different source data are decoded by using a corresponding grey code demapper.

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L. Papke et al., “Combined Multilevel Turbo-Code with MR-Modulation”, Seattle, Jun. 18-22, 1995, New York, IEEE, US, Jun. 18, 1995, pp. 668-672.
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