| 主权项 |
1. A method for obtaining a direction of a signal incoming to a communication device, which is provided with a modal antenna having a plurality of modes corresponding to a plurality of radiation patterns, respectively, the method comprising:
obtaining a gain of the modal antenna at each of predetermined angles for each of the plurality of radiation patterns; first computing a first difference in gain at each of the predetermined angles between each selected pair of the plurality of radiation patterns to obtain a gain variation; measuring a signal strength in a configuration with each of the plurality of radiation patterns; second computing a second difference in signal strength between configurations with each selected pair of the plurality of radiation patterns to obtain a signal strength variation; third computing a third difference between the first difference and the second difference for each of the predetermined angles and for each selected pair of the plurality of radiation patterns; summing a plurality of third differences over all selected pairs of the plurality of radiation patterns to have a value for each of the predetermined angles; and determining an angle of arrival (AOA) of the signal, the AOA giving a minimum among a plurality of values obtained for the predetermined angles, respectively, in the summing. |
