【作者】 陈义平；

【导师】 卞红雨；

【作者基本信息】 哈尔滨工程大学 ， 信号与信息处理， 2008， 硕士

【摘要】 现代数字通信正向着日益复杂的调制方案和大功率激励方向发展,公众对低功耗和高带宽应用的追求,使得越来越多的射频功率器件被推到了超出它们线性范围而进入非线性工作区域,有效地运用工作在非线性区域的器件已日益重要。S参数在电子测量中曾经起着非常重要的作用,基于S参数的理论及其测量仪器曾使微波电子产业发生革命性的变革。但是,S参数只能用于描述电子器件的线性特性及其线性特性的测量,对于广泛存在的电子器件的非线性测量却无能为力。一种超越S参数的射频网络大信号非线性分析测试技术近年来已经成为信息与电子系统学科的一个最新研究热点。本论文从大信号射频网络的非线性测量技术出发,深入阐述了非线性微波系统测量的复杂性和棘手问题;通过对系统的激励和响应的星座图、功率谱和误码率等进行仿真,说明了射频网络非线性对通信系统的严重影响;对一种新颖的包络域表征技术进行了研究,探讨了包络域的表示方法以及如何用包络域方法定性地分析射频微波网络的非线性;推导出双音信号激励的五阶无记忆非线性系统的各个响应分量;最后,基于CDMA信号通过射频功率放大器的五阶非线性模型,使用幂级数和高阶累积量的方法,推导出可以表征功率放大器非线性的邻近信道功率比的严谨表达式,并将仿真结果与三阶非线性失真分析结果及实测数据进行比较,验证该算法的正确性。更多还原

【Abstract】 Modern digital communication is developing towards increasingly complex modulating scheme and high-power. More and more RF power device were pushed into nonlinear region because of pursuing of low consume and high band-width. It is becoming more and more important to the availability using of device working in nonlinear region. S-parameters ever played very important role in electronic measurement. The theory based on S-parameters results in a revolution of micro-electronics industry. However, S-parameters are applicable only if the superposition theorem holds, or in other words if the device or system behaves linear and aren’t applied for analyzing nonlinear system. A technology of Large-Signal Network Analysis Going beyond S-parameters is extensively developed.In this paper, researching from the basic concept of Large-Signal Network Analysis, we discuss the complex and intractability problems of nonlinear microwave systems measurements. Envelope domain technology is a very important concept and analysis method of LSNA technology. We discuss concept and analysis method of envelope domain and demonstrate how apply the method for analyzing RF nonlinear system, explaining the worsen effect of nonlinear distortion in the communication system through simulating constellation, power spectrum and bit-error-ratio of system. Each response elements of fifth-order nonlinear system excited with a two-tone are derived. Based on CDMA signal passed through the nonlinear fifth-order amplifier, closed-form expressions for the ACPR are derived by using power series and high order cumulation, and the analytical results are compared with the simulation results of third-order nonlinear analysis and practical measurement, in order to demonstrate validity of the algorithm.更多还原