BASEBAND VOLTERRA FILTERS FOR IMPLEMENTING CARRIER BASED NONLINEARITIES

A diagonal coordinate representation for Volterra filters is developed and exploited to derive efficient Volterra filter implementations for processing carrier based input signals, In the diagonal coordinate re presentation, the output is expressed as a sum of linear filters appli ed to modified input signals, Hence, linear filtering methods are empl oyed to implement the nonlinear filter on a baseband version of the in put, Downsampling is then used to reduce computational complexity. The same approach is employed to develop efficient implementations for pr ocessing continuous-time carrier-based signals, pulse amplitude-modula ted signals, and frequency division multiplexed input signals.