ANTENNA SWITCHING SYSTEM WITH ADAPTIVE SWITCHING CRITERIA

摘要

Electronic devices are be provided that contain wireless communications circuitry. The wireless communications circuitry includes radio-frequency transceiver circuitry coupled to multiple antennas. Signal strength measurements are gathered using the antennas and corresponding signal strength difference measurements are produced to reflect which of the antennas is exhibiting superior performing. The signal strength difference measurements are filtered using time-based averaging filters with different speeds. Corresponding filtered difference measurements are compared to antenna switching criteria such as antenna switching thresholds. An antenna switching threshold is adjusted in real time based on computations of how much variation is exhibited as a function of time between the difference measurements filtered using the filters of different speeds. In addition, information on device movement or other data may be used in making threshold adjustments.