Global design of perfect-reconstruction orthogonal cosine-modulated filter banks

Designing perfect-reconstruction orthogonal cosine-modulated filter banks is essentially a nonconvex problem and to date only local solutions can be claimed. By virtue of the recent progress in global polynomial optimization, this paper describes an attempt of developing a global design method using an order-recursive strategy combined with a technique that identifies a desirable initial point in each round of recursion. Simulation and comparison studies are presented to evaluate the performance of the proposed design technique.