FIELD: information technology.
SUBSTANCE: method involves sampling (215) by a multi-mode wireless communication device, a broad operational frequency spectrum at a first sampling rate to produce a first set of discrete signal samples. The wireless communication device then compares (230, 240) at least one of the energy graphs of the first set of discrete signal samples with at least one protocol-specific characteristic to confirm (245), if an approximate match is found. When one or more approximate matches are found, the wireless communication device narrows down (250) the broad frequency spectrum to a reduced set of frequency band(s) that correspond to the matched protocol-specific characteristic(s). Then the steps of sampling (215), comparing (230, 240), confirming (245), and narrowing down (250) are recursively followed until a frequency band and operating mode is confirmed.
EFFECT: invention reduces time and energy needed to determine frequency band and operating mode.
23 cl, 6 dwg
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