Digital pre-distortion technique using nonlinear filters

Details Digital pre-distortion technique using nonlinear filters Digital pre-distortion technique using nonlinear filters

2009-10-16

2010-12-07

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S297000, C375S254000, C455S063100, C330S002000, C330S149000

Reexamination Certificate

active

07848451

ABSTRACT:
A system and method for stabilizing a coefficient set used by a digital predistortion (DPD) engine to apply pre-distortion to a transmit signal and cancel distortion generated by a distorting element or distorting system when transmitting the transmit signal, including obtaining an initial coefficient set; rotating the initial coefficient set to maintain a phase of fundamental components (w10(t), . . . , w1Q(t)) of the initial coefficient set as a constant value; averaging in the time domain the rotated coefficient set to obtain an averaged coefficient set; applying the averaged coefficient set to the DPD engine, the initial coefficient set expressed in a first equation [27]; computing the phase of the fundamental components of the initial coefficient set with a second equation [28]; and computing the rotated coefficient set with a third equation [29].

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