MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATIONS OVER NONLINEAR CHANNELS USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING

摘要

An OFDM receiver comprises a (FEC) decoder and a nonlinearity compensation circuit. The nonlinearity compensation circuit is operable to generate estimates of constellation points transmitted on each of a plurality of subcarriers of a received signal based on soft decisions from the FEC decoder and based on a model of nonlinear distortion introduced by a transmitter from which the received signal was received. The generation of the estimates may be based on a measure of distance between a function of the received signal and a synthesized version of the received signal. The generation of the estimates may comprise iterative processing of symbols of the received signal, and the iterative processing may comprise a plurality of outer iterations and a plurality of inner iterations.

主权项

1. A System comprising:
an orthogonal frequency division multiplexing (OFDM) receiver comprising a nonlinearity compensation circuit and a soft-input-soft-output (SISO) forward error correction (FEC) decoder which are operated iteratively, wherein for a particular iteration:
said nonlinearity compensation circuit is operable to generate estimates of constellation points transmitted on each of a plurality of bins of a received signal, wherein:
each of said bins corresponds to a respective one of a plurality of subcarrier and spatial stream combinations; andsaid estimates are generated based on decoded soft bit decisions generated by said SISO FEC decoder during a previous iteration;said SISO FEC decoder is operable to generate soft bit decisions generated from said estimates to generate decoded soft bit decisions for said particular iteration.