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Imputation is achieved using an iterative estimation process; estimates of later iterations may be based on the estimates calculated in previous iterations.
Another parameter impacting the system performance is the number of iterations in iterative estimation.
Figure 3 Input SNR estimation error (in dB) with respect to number of iterations used in iterative estimation.
As for iterative estimation, one can estimate the energy ratios between multiple speakers instead of the SNR in the two-speaker case and adapt the speaker models accordingly.
The number of iterations for the iterative estimation algorithm was set to 4. The number of Monte Carlo runs was 107.
Similar to the case of PAM signaling, we adopt the moment-based estimators as initialization and then apply iterative estimation based on (31) to (35) to refine the estimated results.
An iterative estimation procedure is required to obtain estimates for all parameters because of the dependence of the model for y on the results of the model for ψ and vice versa.
The shrinkage estimates are easy to compute, avoid iterative estimation, minimize the potential for overfitting and do not require extra computation time.
Therefore, partial amplitudes can depend on the particular combination to be evaluated, opposite to an iterative estimation scheme like matching pursuit, where a wrong estimate may produce cumulative errors.
(Both of these estimates differ strongly from those that result from our iterative estimation procedure, indicating its robustness).
(g) Cochleagram of segregated interferer after iterative estimation.
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