Regulating transmit power of signal sources

Example implementations relate to detecting human presence in proximity of a user device. In example implementations, a portion of a first signal may be provided by a first directional coupler that is communicatively coupled to an antenna. A portion of a second signal may be provided by a second directional coupler that is communicatively coupled to a signal source. Transmit power of the signal source may be regulated based on the signal portions provided by the first and second directional couplers. 示例性实施方式涉及检测用户装置附近的人的存在。在示例性实施方式中，第信号的部分可由可通信地连接至天线的第定向耦合器提供。第二信号的部分可由可通信地连接至信号源的第二定向耦合器提供。信号源的发射功率可基于由第定向耦合器和第二定向耦合器提供的信号部分而调节。