Transmitter linearized using look-up table with unadaptable data and method therefor

Abstract

A transmitter () includes a low power nonlinear predistorter () that inserts predistortion configured to compensate for a memoryless nonlinearity () corresponding to gain droop and another memoryless nonlinearity () corresponding to a video signal. When efforts are taken to reduce memory effects, such as configuring a network of components () that couple to an HPA () to avoid resonance frequencies within a video bandwidth (), high performance linearization at low power results without extending linearization beyond that provided by the memoryless nonlinear predistorter (). A unadaptable look-up table () has address inputs responsive to a magnitude parameter () of a communication signal (), a magnitude derivative parameter () of the communication signal (), and a parameter () related either directly or indirectly to battery voltage. The unadaptable look-up table () produces a gain-correcting signal () that adjusts the gain applied to the communication signal () prior to amplification.