Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2006-12-01
2010-06-01
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S296000, C375S355000, C330S149000
Reexamination Certificate
active
07729446
ABSTRACT:
Digital predistortion system, methods and circuitry for linearizing a non-linear element using a multiply partitioned architecture that first addresses long or “memory” effects, and separately addresses shorter duration effects. These blocks or circuits are operated with the non-linear element to provide a highly linear system. A first or long predistortion block receives a baseband signal input and includes a plurality of parallel memory blocks each including a programmable linearity, a digital filter, summers, multipliers and multiplexers with control signals for configuring the blocks to form filters of different types. A second or short predistortion block is coupled to the long predistortion block and comprises a generalized Nth order polynomial filter coupled to a programmable linear equalizer. The first predistorter block compensates for effects of a longer duration, and the second predistorter block compensates for effects of a shorter duration. Methods for initializing, parameterizing and adapting the system are disclosed.
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Brady III Wade J.
Lam Kenneth
Liu Shuwang
Patti John J.
Telecky , Jr. Frederick J.
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