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Since Limís 1986 paper on the frequency-response masking (FRM) technique for the design of FIR digital Ýlters with very small transition widths, the analysis and design of FRM Ýlters have been a subject of study. In this paper, a new optimization technique for the design of FRM Ýlters is proposed. Central to the new design method is a sequence of linear(More)
In this paper, we investigate several efficient interpolation techniques for pilot symbol assisted channel estimation in OFDM. The interpolation methods studied include two dimensional (2-D) separable lowpass sinc interpolator with Kaiser window, 2-D separable Deslauriers-Dubuc (DD) interpolation and 2-D discrete Fourier transform (DFT) based lowpass(More)
—In this paper, minimax design of infinite-impulse-response (IIR) filters with prescribed stability margin is formulated as a conic quadratic programming (CQP) problem. CQP is known as a class of well-structured convex programming problems for which efficient interior-point solvers are available. By considering factorized denominators, the proposed(More)
Designing optimal perfect-reconstruction (PR) and near PR (NPR) cosine-modulated filter banks is essentially a constrained nonlinear minimization problem. This paper proposes two second-order-cone-programming based algorithms for designing NPR and practically PR cosine-modulated filter banks with improved performance relative to several established design(More)