Modulation agnostic digital hybrid mode power amplifier system and method

摘要

A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.

主权项

1. A digital predistortion system for linearizing the output of power amplifiers comprising:
input signal suitable for wireless communications, at least one power amplifier for outputting an amplified signal, at least one feedback signal derived from the amplified signal including a representation of a noise characteristic of the at least one power amplifier, estimator logic responsive to the at least one feedback signal for generating predistortion coefficients based at least in part on feedback path delay determined from the correlation given by the equationC⁡(m)=∑i=0N-1⁢sign⁡(x⁡(i+1)-x⁡(i))⁢sign⁡(y⁡(i+m+1)-y⁡(i+m))n⁡(delay)=Max⁡(C⁡(m)) where x(n) represents transmission data, y(n) represents feedback data, c(m) is a correlation function, N is a number of data per block, m is a variable representing time, I is a counter for summation, and n(delay) is a delay time.