Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-12-06
2009-08-04
Burd, Kevin M. (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S298000
Reexamination Certificate
active
07570699
ABSTRACT:
Provided is a QAM (Quadrature Amplitude Modulation) symbol mapping method and apparatus for downstream transmission of a cable modem. The method includes the steps of: determining phase information on the basis of predetermined relations between two bits representing set partitioning information and two LSBs (Least Significant Bits) of bits representing amplitude information, among bits input for QAM symbol mapping; separating I and Q signals of a first quadrant from the bits representing the amplitude information; and mapping the I and Q signals of the first quadrant to actual positions on the basis of the determined phase information.
REFERENCES:
patent: 2334862 (1999-09-01), None
patent: 1020000014483 (2000-03-01), None
Jin Eun Sook
Kwon O Hyung
Lee Soo In
Blakely , Sokoloff, Taylor & Zafman LLP
Bolourchi Nader
Burd Kevin M.
Electronics and Telecommunications Research Institute
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