A Simple and Effective RF Predistorter for Use in the HPAs of Base Stations in Cellular Mobile Systems
This paper presents the design of using a simple mixer circuit, constructed with Schottky diodes as the nonlinear device, to generate the intermodulation (IM) products for predistortion of high-power amplifiers (HPAs) in the base stations of cellular mobile systems. The design has a simple structure and requires no external dc bias voltage. A complex polynomial is used to model the characteristic of the HPA and the predistorter generates the in-phase and quadrature components of the intermodulation distortion (IMD) products for predistortion of the HPA. Experimental results using a practical HPA show that, for a modulated CDMA (IS-95) signal, the predistorter can reduce the adjacent-channel-power ratio (ACPR) by 15 dB.
Adjacent-channel-power ratio (ACPR) High Power Amplifier Inter-modulation Mixer RF Analog Predistorter
M.X.Xiao S.W.Cheung T.I.Yuk
The Department of Electrical and Electronic Engineering,the University of Hong Kong
国际会议
广州
英文
2008-11-19（万方平台首次上网日期，不代表论文的发表时间）