THE EFFECT OF QUANTIZATION IN A DIGITAL SIGNAL COMPONENT SEPARATOR FOR LINC TRANSMITTERS

This paper analyzes the effect of quantization in a digital signal com ponent separator (SCS) for linear amplification with nonlinear compone nts (LINC) transmitters. The analysis relies on the fact that the two signal components can be obtained as the source signal plus/minus a si gnal in quadrature to the source signal. The equations derived are vit al because they allow the designer to optimize digital signal processo r (DSP) power consumption and bandwidth. The word lengths that are req uired for the source signal and the quadrature signal can be calculate d from the amplifier gain characteristic, the probability density func tion for the modulation scheme, and the specified adjacent channel int erference (ACI). The validity of the analysis has been verified by mea ns of simulations.