Patent ID: 8767871
Filing Date: 2014-07-01
Classification: H04B

Abstract:
1. A method for controlling an antenna tuner coupled between a power amplifier (PA) and an antenna in a wireless device, comprising: measuring forward and reflected signal components at an output of the PA, wherein the forward and reflected signal components result from applying an input signal to a transmit path of the wireless device; generating amplitude and phase information from each of the measured forward and reflected signal components, wherein generating the amplitude and phase information from each of the measured forward and reflected signal components comprises down-converting and digitizing the forward and reflected signal components to generate respectively forward digital baseband in-phase (I) and quadrature (Q) signals and reflected digital baseband I and Q signals; estimating a voltage reflection coefficient using the generated amplitude and phase information; and adjusting the antenna tuner based on the voltage reflection coefficient to reduce an impedance mismatch between the PA and the antenna.