H-infinity sub-optimal causal IIR inverse filter 1.0

[psi gopt] = dfdesign_w(phi, w, d);DFDESIGN_W computes the H-infinity optimal inverse filter of a given filter phi(z).The resulting filter psi(z) minimizes the H-infinity norm of the error systemE_w(z) = [z^(-d) - psi(z)phi(z)]w(z).If an error occurs, use "dfdesign_w_lmi.m".[INPUT]phi: target system (discrete-time), SS or TF objectw: weighting function, SS or TF objectd: reconstruction delay, non negative number[OUTPUT]psi: resulting inverse filtergopt: optimal valueThis is based on the following paper:M. Nagahara and Y. Yamamoto,H-infinity optimal approxmation for causal spline interpolation,Signal Processing, Vol. 91, No. 2, pp. 176-184, 2011.

Requirements:	No special requirements
Platforms:	Matlab
Keyword:	Based,  Delay,  Nagahara,  Negative,  Number,  Output,  Paper,  Reconstruction
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