Fixed-Point Conjugate Gradient Digital Pre-Distortion (DPD) Adaptation
a conjugate gradient and digital predistortion technology, applied in the field of information processing, can solve the problems of inconvenient adjustment of the input signal, and inconvenient adjustment of the output signal,
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[0013]A system, apparatus, and methodology are described for efficient adaptation of a digital predistortion actuator by using fixed-point conjugate gradient scheme to evaluate the digital predistortion system polynomials with a flexible high performance digital pre-distortion (DPD) hardware or software solution which performs pre-distortion processing on received baseband signal samples to overcome power amplifier non-linear operation (a.k.a. distortion). In selected embodiments, a single chip digital front end processor at a base station performs digital pre-distortion on a composite multi-carrier waveform using a polynomial DPD actuator or LUT-based DPD actuator which may use integrated predistorter hardware cells to evaluate Volterra series memory polynomial terms and higher order cross terms (e.g., type 1, 2 and 3) to model the inverse operation of power amplifiers (PA). In order to track changes in the performance of the power amplifier, the polynomial coefficients in the DPD ...
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