Power series predistorter and control method thereof

Details Power series predistorter and control method thereof Power series predistorter and control method thereof

2011-05-24

2011-05-24

Nguyen, Hieu P (Department: 2817)

Amplifiers

Hum or noise or distortion bucking introduced into signal...

C375S297000

Reexamination Certificate

active

07948311

ABSTRACT:
A power series predistorter of the present invention includes a delay path for delaying a signal, a distortion generation path having an N-th order distortion generator and a vector adjuster, a divider for dividing an input signal between the delay path and the distortion generation path, a combiner for combining the output signal of the delay path and the output signal of the distortion generation path, and a controller for controlling the vector adjuster. The controller includes a setting unit, a distortion component measurement unit, a minimum condition calculation unit, and a recording unit. The setting unit specifies the phase or amplitude value of the vector adjuster. The distortion component measurement unit measures the distortion component of a power amplifier. The minimum condition calculation unit obtains a phase or amplitude value that minimizes the distortion component by function approximation, using the magnitude of the distortion components corresponding to three or more phase or amplitude values specified for sampling by the setting unit.

REFERENCES:
patent: 4329655 (1982-05-01), Nojima et al.
patent: 7081795 (2006-07-01), Matsuura et al.
patent: 7196576 (2007-03-01), Mizuta et al.
Toshio Nojima, et al., “Predistortion Nonlinear Compensator for Microwave SSB-AM System”, IEICE Transactions, vol. J67-B, No. 1, Jan. 1984, pp. 78-85, (with partial English translation).
Shinji Mizuta, et al., “A New Adjustment Method for Frequency Characteristics Compensator of the Digital Predistortion Linearizer Compensating Frequency-Dependent IMD with Continuous Spectrum”, C-2-15, Electronics Society Conference, IEICE, Sep. 2005, p. 35. (with English translation).

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