软件无线电中ADC孔径抖动对SNR影响的建模与仿真  

Modeling and Simulation of the Impact of Aperture Jitter on SNR in ADC in Software Radio

作　　者：苏雪[1] 覃远年[1] 田克纯[1] 王吉平[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西 桂林 541004

出　　处：《计算机工程与科学》2010年第10期153-156,共4页Computer Engineering & Science

基　　金：广西自然科学基金资助项目(桂科自0832245);广西教育厅科研(桂教科研200708MS005)

摘　　要：利用Simulink建立了两种仿真模型验证分析软件无线电中ADC孔径抖动对SNR的影响,模型一采用输入信号的抖动来仿真ADC采样孔径抖动产生的影响,模型二采用时钟源加入高斯噪声的方法较真实地模拟了ADC采样时钟的抖动情况。两种模型的仿真曲线与理论曲线基本吻合,证明了模型的正确性,尤其是模型二建模解决了有抖动的采样脉冲产生和参数计算中信号同步的关键问题,得到了更真实、准确的特性曲线,为深入研究高速高精度ADC的孔径抖动测量、分析和控制提供了一个比较可靠的依据,对系统设计提供了有益帮助。Two simulation models are established by Simulink to verify and analyze the impact of aperture jitter on SNR in ADC in software radio. The first simulats the effect of the sampling ADC aperture jitter using the jitter of input signals, and the second simulats the ADC sampling clock jitter more accurately by adding the Gaussian noises to the clock source. The simulation curves of these two models are consistent with the theoreticalones, which verifies that the models are correct, especially for the second. It resolves two key issues, the generation of the sampling jitter pulses and the signal synchronization in parameter calculation, and more truly and accurately curves are obtained, and it provides a more reliable basis for an indepth study of measurement, analysis and control of highspeed and high precision ADCs’ aperture jitter, which is helpful in the design of the system.

关 键 词：孔径抖动 模数转换器 软件无线电 信噪比 

分 类 号：TP242[自动化与计算机技术—检测技术与自动化装置]