| 摘要 |
<p>A signal is classified as being one among a plurality of classifications by employing a prescribed relationship between absolute moments (generated via 19, 26, 27, 28, 29, 30) of a complex low-pass version (10-16) of the signal. Specifically, the prescribed relationship is related to the second order moment (m2, 19, 27, 30) of the magnitude of the complex low-pass version being normalized (via 29) by the first order moment squared (m1<2>, 19, 26, 28). This results in a so-called normalized variance ( eta ) which is compared (via 31) to predetermined threshold values to classify the signal as having one of a plurality of modulation schemes, e.g., FSK, PSK or QAM.</p> |
