Patent ID: 6956433

Claim:
A polynomial predistorter for predistorting a complex modulated baseband signal, providing the predistorted signal to a power amplifier, and compensating for the non-linear distortion characteristic of the power amplifier using complex vector multiplication, comprising: a first complex multiplier for generating first complex predistortion gains using a current input signal and complex polynomial coefficients, for in-phase (I) predistortion and quadrature-phase (Q) predistortion, the complex polynomial coefficients being modeled on the inverse non-linear distortion characteristic of the power amplifier, and multiplying the first complex predistortion gains by I and Q signal components of the current input signal, respectively; at least one second complex multiplier for generating second complex predistortion gains using the complex polynomial coefficients and previous predistorted signals corresponding to the complex polynomial coefficients, for the I predistortion and the Q predistortion, and multiplying the second complex predistortion gains by I and Q signal components of the previous predistorted signals, respectively; and a summer for generating a predistorted signal by summing outputs of the first and second complex multipliers and outputting the predistorted signal to the power amplifier.