Discrete-Time Dithering Technique for Designing Time-Varying Signal Adapted Filter Banks

This paper describes the use of sinusoidal dithers in a lattice filter bank structure to create a time-varying paraunitary filter bank that approximates and tracks in near real-time the ideal principal component filter bank corresponding to a nonstationary random input process. The sinusoidal dithers are used to estimate the gradient of a cost function which is minimized using non-linear minimization techniques.