29. The wireless communication apparatus of claim 17 , wherein the circuitry is configured to direct the impairment correlation estimator to determine the composite impairment correlation term based on the subset of modeled impairment correlation terms by directing the impairment correlation estimator to scale the modeled impairment correlation terms included in the subset by respective model fitting parameters and to combine the scaled modeled impairment correlation terms to form the composite impairment correlation term.
32. The wireless communication apparatus of claim 29 , wherein the circuitry is configured to determine the model fitting parameters in accordance with a least-squares process.