Comments on "Least squares methods for H/spl infin/ control oriented system identification"

In the above paper by Helmicki-Jacobson (ibid. vol.38, no.5, p.819-26 (1993)), the authors present two sets of convergent least squares algorithms for identification in H/spl infin/. In this paper we: (1) point out an error in the proof of convergence for the first set; (2) show that the first set of optimization problems is really equivalent to a special case of the second set; and (3) provide a small correction to the derivation of the error bounds for the second set of algorithms.<
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