Study of Direct RF Sampling System on Software Radio Based on Stochastic Demodulation
The bottleneck of high-speed signals sampling system is that it cannot sample directly higher frequency signal because of lower analog input bandwidth of its ADC.In order to resolve this problem,a kind of sampling model based on stochastic demodula-tion is presented in combination with the development of a high-speed and high-precision data recorder,the stochastic demodulation sampling is then transformed into a mathematical model that can perform matrix calculation through matric theory.The model a-chieves the high-speed analog signal sampling with low-speed A/D converters by means of stochastic demodulation and anti-aliasing filter.According to the model of sampling,a reconstruction method of sampling based on least squares is proposed,and its recon-struction error is quantitatively analyzed.The sampling model is proved by simulation,it is showed that the sampling system is effec-tive,the sampling error is better than that of a single ADC.
万方数据
维普
