Envelope Correlation of Undersampled Data by Digital Processing
Benjamin F. Cron, Albert H. Nuttall · 1971
Abstract : Digital computers can be used to obtain the complex envelope correlation of undersampled data. To obtain the complex envelope of the original process, a band of frequ easily shifted down to a center frequency of 0 Hz. A quantitative comparison of the theoretical and computed results shows that the digital method was accurate when employed for two specific examples of a sinc pulse and a linear FM pulse. (Author)