Multicarrier successive predistortion for digital transmission

摘要

An approach for improved compensation for nonlinear distortion in multicarrier satellite systems is provided. Source reflecting encoded and modulated sequences of source data symbols are received. Each source signal is predistorted, and a transmit filter is applied to each predistorted source signal. Each filtered signal is translated to a carrier frequency, and the translated signals are combined into a composite signal for transmission via a multicarrier transponder. The final predistorted version of each source signal is generated via an iterative process of a number of stages, wherein, for a given stage and for each source signal, the process comprises: receiving a prior predistorted version of each source signal from a preceding stage; processing each prior predistorted source signal based on all of the received prior predistorted source signals, wherein the processing is performed based on a characterization of one or more characteristics of the multicarrier satellite transponder.

主权项

1. A method comprising:
receiving a plurality of source signals, wherein each source signal comprises a sequence of source data symbols; encoding and modulating each source signal for transmission via a multicarrier channel of a wireless communications system; generating a final predistorted version for each encoded and modulated source signal; applying a transmit filter to the final predistorted version of each of the source signals; translating each of the filtered signals to a respective carrier frequency; and combining the translated signals to generate a composite signal for transmission via the multicarrier channel; wherein the final predistorted version for each of the encoded and modulated source signals is generated via an iterative process of a number of stages, wherein, for a given stage and for each source signal, the process comprises:
receiving a respective prior predistorted version of each of the source signals from a preceding stage; andprocessing the prior predistorted version of the source signal based on the received prior predistorted versions of all of the source signals from the preceding stage, such that, at each stage, the processing of the prior predistorted version of each source signal takes into account the prior predistorted versions of all the encoded and modulated source signals from the preceding stage, wherein the processing of the prior predistorted version of the source signal is performed based on a characterization of one or more characteristics of the multicarrier channel.