【作者】 孙进芳； 李晓白； 金天； 朱俊杰；

【Author】 Sun Jinfang Li Xiaobai Jin Tian Zhu Junjie (School of Electronic and Information Engineering,Beijing University of Aeronautics and Astronautics,Beijing,100083)

【机构】 北京航空航天大学电子信息工程学院；

【摘要】 随着数字信号处理和数字器件的不断发展,数字接收机的使用越来越广泛。数字化是数字技术应用的前提,A/D 转换器是主要的数字化器件。由于模拟信号数字化必然带来信噪比的恶化,所以必须对恶化程度进行定量估计。在高灵敏接收机里,量化噪声也是影响接收机灵敏度的重要因素。本文通过对载噪比的计算来研究量化对载噪比的影响,并且仿真得到了1比特、2比特、3比特、4比特量化引起的载噪比的衰减, 结论得出在量化比特大于3的情况下对载噪比的影响已经非常有限。更多还原

【Abstract】 With the development of digital signal processing and digital components,digital receivers have been widely used.The digitization is the premise of digital technology application.The A/D converter is a main digital device.The digital of signals will cause the degradation of SNR,so quantitative estimation of degradation must be carded on.In the high sensitive receiver,quantification noise is also a significant factor on the influence of sensitive. This paper analyzed the influence of quantization effect on CNR by the computation of CNR,and obtained the degradations of CNR by 1 bit,2 bit,3 bit,4 bit quantification through computer simulation.The result is that the influence of CNR is already limited when quantification length is bigger than 3.更多还原