18454740. Frequency Selective Digital Pre-Distortion Signal Generation (QUALCOMM Incorporated)
Contents
Frequency Selective Digital Pre-Distortion Signal Generation
Organization Name
Inventor(s)
Hao-Jen Cheng of San Jose CA (US)
Frequency Selective Digital Pre-Distortion Signal Generation
This abstract first appeared for US patent application 18454740 titled 'Frequency Selective Digital Pre-Distortion Signal Generation
Original Abstract Submitted
This disclosure provides methods, components, devices and systems for signal generation. Some aspects more specifically relate to frequency-selective digital predistortion signal generation. In some examples, the method alters an input signal to produce a frequency-selected linear output signal of a power amplifier. For frequency-selective pre-distortion signal generation, a digital pre-distortion circuit suppresses the non-linear distortion at a specific band using Volterra kernels of a Volterra series model and a shiftable finite impulse response (FIR). The shiftable FIR can filter a particular portion of the signal's frequency, and the Volterra kernels can capture the non-linear memory effects of the input signals and output signals of the power amplifier. Upon refinement of the Volterra kernel coefficients, the Volterra series model can produce a compensation signal. The shiftable FIR can filter the compensation signal to produce a digital pre-distortion signal to input into the power amplifier for transmission.
