Theory and design of signal-adapted FIR paraunitary filter banks

Pierre Moulin, Mehmet Kivanç Mihçak

Research output: Contribution to journalArticle

Abstract

We study the design of signal-adapted FIR paraunitary filter banks, using energy compaction as the adaptation criterion. We present some important properties that globally optimal solutions to this optimization problem satisfy. In particular, we show that the optimal filters in the first channel of the filter bank are spectral factors of the solution to a linear semiinfinite programming (SIP) problem. The remaining filters are related to the first through a matrix eigenvector decomposition. We discuss uniqueness and sensitivity issues. The SIP problem is solved using a discretization method and a standard simplex algorithm. We also show how regularity constraints may be incorporated into the design problem to obtain globally optimal (in the energy compaction sense) filter banks with specified regularity. We also consider a problem in which the polyphase matrix implementation of the filter bank is constrained to be DCT based. Such constraints may also be incorporated into our optimization algorithm; therefore, we are able to obtain globally optimal filter banks subject to regularity and/or computational complexity constraints. Numerous experiments are presented to illustrate the main features that distinguish adapted and nonadapted filters, as well as the effects of the various constraints. The conjecture that energy compaction and coding gain optimization are equivalent design criteria is shown not to hold for FIR filter banks.

Original languageEnglish (US)
Pages (from-to)920-929
Number of pages10
JournalIEEE Transactions on Signal Processing
Volume46
Issue number4
DOIs
StatePublished - Dec 1 1998

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Keywords

  • Filter banks
  • Linear optimization
  • Subband coding
  • Wavelets

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

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