Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Reexamination Certificate
2003-06-30
2008-08-12
Wang, Ted (Department: 2611)
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
C375S261000, C375S279000, C375S372000, C332S103000, C332S104000
Reexamination Certificate
active
07412008
ABSTRACT:
A modulator (10) and method provides a programmable phase rotation for supporting different modulation formats and different phase rotations. The modulator (10) includes a programmable symbol counter (32) and symbol phase rotation logic (31) operatively responsive to programmable phase rotation size data (36) and programmable counter size data (30). The modulator (10) can be used to communicate with different modulation formats employing different phase rotation conventions as used in different communication systems. The symbol phase rotation logic (31) produces rotated in-phase data (20) and rotated quadrature data (22) in response to receiving at least received symbol data (24), programmable phase rotation size data (36), and symbol count data (32) based on programmable counter size data (30). According to another embodiment, the phase rotations of the modulator (10) may be dynamically selectable such that the phase rotations may be selected to accommodate changes in channel characteristics in real time.
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Wang Ted
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