Pulse or digital communications – Receivers – Amplitude modulation
Reexamination Certificate
2006-12-12
2006-12-12
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Amplitude modulation
C375S324000
Reexamination Certificate
active
07149259
ABSTRACT:
A OAM receiver includes a source of a received hierarchical OAM signal. The hierarchical OAM signal represents successive data points in the I-Q plane, each data point being in one of four quadrants. Circuitry, coupled to the hierarchical OAM signal source, calculates the location in the I-Q plane of the center-of-gravity of successive received data points in a quadrant. A level 1 decoder is responsive to a received data point and detects the quadrant in the I-Q plane of a received data point. Further circuitry, coupled to the hierarchical OAM signal source and responsive to the calculating circuitry, translates the received data point in the I-Q plane such that the center-of-gravity of the detected quadrant is translated to the origin of the I-Q plane. A level 2 decoder is then responsive to the translated data point for detecting the quadrant of the translated data point.
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Search Report.
Krauss Thomas Peter
Ramaswamy Kumar
Settle Timothy Forrest
Eriksen Guy H.
Fan Chieh M.
Lu Jia
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