Digital Broadband Multichannel Receiver with Subsampling Operation Analysis

The major objective of this research was to investigate the operation of a digital wideband receiver. In particular, this study will examine an inputs' model, which consists of a combination of several simultaneously existing harmonic signals. The receiver represents a multichannel device with parallel operation of channels in the subsampling mode. The case of different channels' sampling frequencies is assumed. After the downsampling, in all the channels an analog-to-digital conversion is performed. The results are used to restore the frequencies of the input multi-component signal. The model of signal conversion in the proposed receiver is presented, as well as the results of numerical simulation of its operation. To be more exact, the following aspects are found out: determining of the input signals' frequencies with multiple (up to 6) channels in parallel, and several - up to 5 simultaneously present receiver input frequencies with subsampling from up to 11-th Nyquist zone.