“…The robust stability, stabilization, control, and filtering problems for stochastic systems have been intensively investigated by many researchers, and many results on these topics have been reported in the literature; see, e.g., [7], [18], [19]. The H ∞ disturbance rejection level is a well-known important criterion for quantifying the system performances, and has been widely used in studying robust control and signal processing problems for deterministic and stochastic systems; see, e.g., [4]- [6], [13]- [16], [18], [19], [21]. Also, the H ∞ deconvolution filter design problem has been investigated for deterministic and stochastic systems; see [13], [14], [20] for some recent publications.…”