%0 Journal Article
%T Digital Component Separator for future W-CDMA-LINC Transmitters implemented on an FPGA
%A W. Gerhard
%A R. Kn£¿chel
%J Advances in Radio Science : Kleinheubacher Berichte
%D 2005
%I Copernicus Publications
%X This paper presents the implementation of a Digital-Component-Separator (DCS) for a LINC-transmitter (linear amplification using nonlinear components) on an FPGA (field programmable gate array). It investigates and estimates the bandwidth requirements for such a LINC system. The influence of bandwidth limitations on a digitally based LINC-transmitter for W-CDMA utilization is studied by simulations. Furthermore a LINC transmitter is proposed which employs a flexible image-reject- or a direct up-conversion-architecture for transmission of single or combined multi-carrier/channel W-CDMA signals using the phase-modulation approach. The sampling frequency can be chosen at a value up to 32 times (122.88MHz) the symbol rate of the W-CDMA chip rate of 3.84Mbits/s. Measurement results for a LINC transmitter are presented and discussed.
%U http://www.adv-radio-sci.net/3/239/2005/ars-3-239-2005.pdf