Smart antenna controlling method and smart antenna system

A smart antenna system comprising:

• a plurality of antennas configured to receive a plurality of wireless signals transmitted by a wireless access point, respectively;
• a wireless network controller configured to provide a plurality of received signal strength indications (RSSIs) respectively corresponding to the plurality of wireless signals according to the plurality of wireless signals received by the plurality of antennas;
• a processor, electrically coupled to the wireless network controller and the plurality of antennas, configured to generate a plurality of control signals respectively corresponding to the plurality of antennas according to the plurality of RSSIs;
• and
• a plurality of switching circuits coupled to the processor, and respectively coupled to the plurality of antennas, configured to switch radiation patterns of the plurality of antennas according to the plurality of control signals, respectively, such that the plurality of RSSIs of the plurality of wireless signals are substantially the same and not lower than a threshold value,
• wherein the processor is further configured to execute operations below:
• generating a control signal having a preset value, by the processor, if one of the plurality of RSSIs is smaller than the threshold value;
• and
• switching the control signal to another value different from the preset value, by the processor, if the one of the plurality of RSSIs is larger than the threshold value, wherein the control signal having the another value is configured to switch a radiation pattern of a corresponding one of the plurality of antennas, and the control signal having the preset value is configured to keep a radiation pattern of the corresponding one of the plurality of antennas.