SAR control using capacitive sensor and transmission duty cycle control in a wireless device

摘要

A wireless device for providing specific absorption rate (SAR) control comprising a wireless transmitter, a capacitance sensor, and a processor coupled to the wireless transmitter and the capacitance sensor, wherein the processor is configured to receive a first capacitance measurement from the capacitance sensor, estimate a relative proximity of a human body to the apparatus based on the measurement, determine a target transmission time for the wireless transmitter within a time period based on the estimate, and switch off the wireless transmitter for a portion of the time period if a transmission time of the wireless transmitter during the time period exceeds the target transmission time.

主权项

1. A wireless device for providing specific absorption rate (SAR) control comprising:
a wireless transmitter; a capacitance sensor; and a processor coupled to the wireless transmitter and the capacitance sensor, wherein the processor is configured to:
receive a first capacitance measurement from the capacitance sensor;estimate a relative proximity of a human body to the apparatus based on the first capacitance measurement;determine a target transmission time for the wireless transmitter within a time period based on the estimate;compare a channel quality metric to a threshold;determine a power backoff factor;transmit at a power level reduced from a maximum power level by the power backoff factor during the time period when the channel quality metric is greater than the threshold; andswitch off the wireless transmitter for a portion of the time period when a transmission time of the wireless transmitter during the time period exceeds the target transmission time and the channel quality metric is less than the threshold.