Adaptive High-Order Nonlinear Function Approximation Using Time-Domain Volterra Series to Provide Flexible High Performance Digital Pre-Distortion

摘要

A kind of pre-distortion block that method and apparatus use one or more digital predistorters according to predistorted input signal sample Volterra series approximate model is all used to( 300 ),It is with multiple units( 301-303 ),Each input multiplication stage( 366-367 )In conjunction with absolute sample value from absolute sample delay line( 362 )It is exported into the first order,Look-up table( 368 )It is connected to address the output that first order output generates LUT,With multiple output multiplication stages( 371-372,373-374 )In conjunction with the sample magnitude sampling delay line for exporting with receiving of LUT,The delay line( 362 )With( 363 )Sample of signal with generate output signal sample from the predistorter yQ units in output signal yQ cell combination of the sample from predistorter in an output adder circuit( 300 )0,Signal is combined to generate one or more Volterra terms( yOUT[n] ).