期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2014
卷号：69
期号：1
出版社：Journal of Theoretical and Applied
摘要：The Power Amplifier plays the major role in boosting the message signal strength. The Memoryless non linearity nature of the Power amplifier varies according to its output power function. The nature of the amplifier can be difined by diffrent models. By this factor, PA has been classified in to diffrent types. Here we choosed Saleh model PA which is best suited for TWT type amplifers. To linearize the PA, Pre-distortion is one of the method used. Here we are going to use NLMS algorithm in Predistorter and evaluates its error estimating capability for saleh power amplifier model using diffrent Phase shift key modulation methods like BPSK, QPSK, 8-PSK,16-QAM. We measured ACP and EVM for the above modulations using Matlab software.
关键词：NLMS- Normalized Least Mean Square; PA- Power Amplfier; QAM- Quadrature Ampliture Modulation; BPSK- Binary Phase Shift Keying; QPSK- Quadrature Phase Shift Keying; PSK- Phase Shift Keying; TWT- Travelling Wave Tube; ACP � Adjacent Channel Power EVM � Error Vector Magnitude.
