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 本课题从大信号网络分析的基本概念出发,详细讨论了射频网络非线性的测量理论和技术以及互调失真表征技术,分析了在单频音和多频音信号激励下的一些非线性特性,如am - am , am - pm ,谐波失真,互调失真( imd )和临近信道功率比( acpr )等,以及根据包络域方法定性地分析射频微波网络的非线性特性,以此来进行射频网络的非线性测量和校准。
Intermodulation suppression for fh ( frequency hopping ) receiver is designed by selecting the intermediate frequencies and changing group of filters , local oscillation ( lo ) frequency , bandwidth of lo frequency under the condition that receiver configuration , sensitivity , dynamic range , instantaneous bandwidth and precision of frequency measurement are fixed 摘要针对跳频接收机的体制和灵敏度、动态范围、瞬时工作带宽、测频精度等设计参数,通过改变预选器组成、本振频率和本振带宽,分析接收信道的中频选取原则,以实现跳频接收机的互调抑制设计。
With each other the lose the true intermodulation distortion department to point to be lost by enlarger a kind of importation signal for into of with and badly really . for example , at input frequency to enlarger to 1 the khz with 5 khzs admixture signal empress , would then produce 6 khz 1 khz with 5 khz it with and 4 khz 1 khz with 5 khz it bad of with each other the lose the true composition 互调失真intermodulation distortion系指由放大器所引入的一种输入信号的和及差的失真。例如,在给放大器输入频率为1khz和5khz的混合信号后,便会产生6khz 1khz和5khz之和及4khz 1khz和5khz之差的互调失真成份。
The main studying of this dissertation is about cubic analog predistorer , digital predistortion linearizer based on look - up table ( lut ) technology and feedforward - predistortion linearization system . the original work and valuable results in this dissertation are as follows . 1 . a novel third - order distortion generator which can suppress the residual second - order intermodulation distortion ( imd2 ) is presented 本论文的研究分别涉及三阶模拟预失真系统、查找表预失真系统和前馈预失真系统,其中有创新和有价值的工作主要体现在以下三个方面: 1 :对于采用二极管反向平行对的三阶模拟预失真系统,本文提出了一种可以抑制驻留二阶交调( imd2 )信号的新型三阶扰动器。