Communication device and method of multipath compensation for digital predistortion linearization

摘要

A method of multipath compensation for digital pre-distortion (DPD) linearization suppresses linear distortion caused by reflected signals and distortion in transmitting and receiving paths. Reflection suppression suppresses effects of the linear distortion on the transmitting and receiving paths.

主权项

1. A method of multipath compensation for digital pre-distortion (DPD) linearization, executable by a communication device, comprising:
receiving a multi-carrier signal and processing the multi-carrier signal in a crest factor reduction (CFR) stage of the communication device to generate post CFR signals; processing the post CFR signals with a transmission filter compensation (TFC) stage of the communication device to generate post TFC signals; in an up-sampling stage of the communication device, up-sampling the post TFC signals to a higher sampling rate that is wide enough to process an intermodulation bandwidth of the post TFC signals to generate up-sampled signals; applying digital pre-distortion (DPD) to the up-sampled signals in a first DPD engine of the communication device between the up-sampling stage and a power amplifier (PA) of the communication device to generate predistorted signals, wherein the predistorted signals has an inverse non-linearity distortion to compensate non-linearity of the PA of the communication device; and converting the predistorted signals in a digital to analog converter (DAC) of the communication device to generate analog predistorted signals; transmitting the analog predistorted signals to the PA; and generating and outputting by a DPD linearizer algorithm stage of the communication device a DPD solution to the first DPD engine to enable the first DPD engine perform DPD algorithm according to the DPD solution, wherein the DPD linearizer algorithm stage generates the DPD solution based on the predistorted signals and feedback signals sampled from amplified signals output by the PA; wherein the DPD linearizer algorithm stage generates the DPD solution to suppress multi path distortion of the feedback signals sampled from amplified signals.