Nonlinearity compensation for reception of OFDM signals

摘要

An electronic receiver may comprise nonlinear distortion modeling circuitry, interference estimation circuitry, and sequence estimation circuitry. The receiver may receive an orthogonal frequency division multiplexing (OFDM) symbol in the form of an electromagnetic signal. The nonlinear distortion modeling circuitry may generate a nonlinear distortion model that models nonlinear distortion introduced to the received electromagnetic signal en route to the sequence estimation circuitry. The interference estimation circuitry may estimate inter-subcarrier interference present in the received OFDM symbol based on the generated nonlinear distortion model. The estimating of the inter-subcarrier interference may comprise applying the nonlinear distortion model to one or more candidate vectors generated by the sequence estimation circuitry. The sequence estimation circuitry may sequentially process a plurality of received virtual subcarrier values of the OFDM symbol using the estimated inter-subcarrier interference.

主权项

1. A receiver comprising:
an analog front end circuit operable to receive a nonlinearly distorted orthogonal frequency division multiplexed (OFDM) symbol that is a result of a plurality of symbols transmitted on a plurality of subcarriers; nonlinear distortion modeling circuitry operable to generate a model of nonlinear distortion introduced to said OFDM symbol by a transmitter, wherein:
a result of said nonlinear distortion is inter-subcarrier interference in said received OFDM symbol; andsaid model of said nonlinear distortion is a digital clipping model; and circuitry operable to:iteratively calculate metrics based on said received OFDM symbol and said model of nonlinear distortion; anddetermine values of said symbols based on said metrics.