The Nonlinearity Analysis And Simulation Of RF Network Excited With Modulation Signals

With the rapid development of wireless communication technology, the research in nonlinear regions becomes more important. It is well known that s-parameters played very important role in electronic measurement. However, s-parameters are applicable only if the superposition theorem holds, or in other words if the device or system behaves linear and are unavailable in most non linear measurements. Recently, the large signal network analysis(LSNA) and testing technology for RF going beyond S parameters has become one of the hot issues in the science of electronic and communication. The intermodulation distortion and envelope domain characterization technology are very important concepts of LSNA technology. It has great significance to research from this basic concepts in nonlinear analysis of RF network.In this dissertation, researching from the basic concept of large signal network analysis, we discuss the measurement theory and technology of RF network nonlinearity and the characterization technology of intermodulation distortion in detail, and analyse some nonlinear characteristic excited with a one tone or multi-tone, such as AM-AM, harmonic distortion, intermodulation distortion, adjacent channel power ratio and how to qualitatively analyse nonlinearity of RF network to make the measurement and calibration. Moreover, close-form expressions for the power spectral density and ACPR of CDMA signal passed through a nonlinear power amplifier are derived using the power series and statistical model of CDMA signal. The comparison computer between algorithm simulation and practical data or experimental data derived using ADS proves the validity. Finally, we make a comparison of the IMD and ACPR measurement.