Pulse or digital communications – Transmitters
Reexamination Certificate
2004-12-22
2010-10-19
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Transmitters
C375S260000, C375S229000, C375S222000, C375S240290
Reexamination Certificate
active
07817743
ABSTRACT:
A multi-tone system includes a data transmission circuit with an interface for receiving a data stream for transmission, a data steam splitter that splits the data stream to produce multiple substreams and a plurality of parallel data preparation circuits. Each data preparation circuit prepares a respective substream for transmission and generates a respective sub-channel signal. At least a first data preparation circuit of the plurality of parallel data preparation circuits includes a first analog filter for filtering a first substream. The first analog filter operates at a sample rate greater than the respective symbol rate of the first substream. The first analog filter provides pre-emphasis of the respective sub-channel signal and attenuation of signals outside of a respective band of frequencies corresponding to the respective sub-channel signal. The data transmission circuit also includes a combiner for combining respective sub-channel signals to generate a data transmission signal.
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Amirkhany Amir
Stojanovic Vladimir M.
Zerbe Jared L.
Lam Kenneth
Liu Shuwang
Morgan & Lewis & Bockius, LLP
Rambus Inc.
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