Antenna switching system with adaptive switching criteria

A method of operating an electronic device that has first and second antennas, wherein one of the antennas is selectively switched into use to serve as a currently active antenna that handles wireless communications traffic for the electronic device, the method comprising:

• measuring a first signal strength associated with receiving antenna signals through the first antenna;
• measuring a second signal strength associated with receiving antenna signals through the second antenna;
• producing difference measurements by computing differences between the first and second measured signal strengths;
• applying a first averaging filter to the difference measurements to produce first filtered difference measurements;
• applying a second averaging filter to the difference measurements to produce second filtered difference measurements;
• and
• applying antenna switching criteria to the first and second filtered difference measurements to determine which of the antennas is to serve as the currently active antenna.

An electronic device, comprising:

• wireless circuitry including at least first and second antennas and radio-frequency transceiver circuitry that is coupled to the first and second antennas;
• and
• control circuitry configured to control the wireless circuitry to switch a selected one of the first and second antennas into use to handle wireless communications traffic for the electronic device, wherein the control circuitry and wireless circuitry are configured to:
• obtain difference measurements reflecting how much received antenna signal strength differs between the antennas;
• apply first and second time-based averaging filters with different respective filtering speeds to the difference measurements to produce respective first and second filtered difference measurements;
• and
• apply antenna switching criteria to the first and second filtered difference measurements to determine whether to switch the first or the second antenna into use to handle the wireless communications traffic.

A method of operating an electronic device that has first and second antennas, wherein one of the antennas is selectively switched into use to serve as a currently active antenna that handles wireless communications traffic for the electronic device, the method comprising:

• measuring a first signal strength associated with receiving antenna signals through the first antenna;
• measuring a second signal strength associated with receiving antenna signals through the second antenna;
• producing difference measurements by computing differences between the first and second measured signal strengths;
• applying first and second filters with different filtering speeds to the difference measurements to produce respective first and second filtered difference measurements;
• and
• applying antenna switching criteria to the first and second filtered difference measurements to determine which of the antennas is to serve as the currently active antenna, wherein applying the antenna switching criteria comprises computing a value indicative of how many times per unit time an antenna switching threshold is exceeded by at least one of the first and second filtered difference measurements.