Multiple frequency detection in undersampled complex-valuedwaveforms with close multiple frequencies
G. Tong Zhou, Xiang‐Gen Xia · Electronics Letters · 1997
The determination of multiple frequencies in undersampled waveforms is studied, where the multiple frequencies are close to each other. Given multiple undersampling rates, the maximal range of the detectable multiple frequencies is the least common multiple of these multiple rates under the assumption that these rates are larger than twice the maximal distance between the multiple frequencies.