Method and apparatus for reducing intermodulation distortion in digital wideband transmission systems

摘要: Signal processing to remove unwanted signal components of non-linear elements such as RF amplifiers in broadband wireless communications systems that exhibit intermodulation products. An information is processed form a output signal, Vod. A preprocessor includes base modulator for modulating the modulated signals, band signals an input Vi, distortion processor providing predistortion Vpd having selected terms Taylor series [k1(Vi)1, k2(Vi)2, k3(Vi)3,...], and combining V?i? predistorted Vid with [k1(Vi)?1, k?2(Vi)2, k3(Vi)3,...] reduced amplitude. element transfer function process V?id? Amplifiers achieve substantial improvements efficiency, increase 40-80% usable power, due reduction In particular, third order products are reduced.