**Signals, Systems and Inference, Chapter 11: Wiener Filtering**
https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-011-introduction-to-communication-control-and-signal-processing-spring-2010/readings/MIT6_011S10_chap11.pdf

Section 11.1 Noncausal DT Wiener Filter 197 In other words, for the optimal system, the cross-correlation between the input and output of the estimator equals the cross-correlation between the input and target output. To actually ﬁnd the impulse response values, observe that since yb[n] is obtained

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