Methods and devices for performing dynamic compensation of a phased array RFID reader are disclosed herein. An example method includes configuring an RFID reader having an antenna array to compensate for determined antenna element phase-shift errors. The method includes exciting a reference antenna element of the antenna array, emitting an emitted signal, receiving the emitted signal via a receiver antenna element of the antenna array, and generating a received signal. The method further includes determining, by a processor, a phase shift of the received signal relative to the emitted signal, and determining a phase-shift error. The method then includes configuring the RFID reader to compensate for the determined phase-shift error associated with the receiver antenna element in response to receiving an RFID tag signal.

Example techniques relate to grouping based on acoustic signals in a system including a first network device and a second network device. A first network device may detect a first acoustic signal, perhaps while playing back first audio content in a single-device playback configuration. The first network device sends, to the second network device, data corresponding to the detected first acoustic signal. The second network device may generate one or more instructions based on the sent data corresponding to the detected first acoustic signal and send data representing such instructions to the first network device. Based on the instructions, the first network device transitions from operating in the single-device playback configuration to operating in a grouped playback configuration. In the grouped configuration, the first network device outputs second audio content in synchrony with the third network device.

A system for detecting fake information about a vehicle location may include a radio signal receiver configured to receive a radio signal from a communication system; a message receiver configured to receive the radio signal to generate a message and determine the message to generate information about a location of the communication system; a radio signal incident angle calculator configured to generate a radio signal incident angle; an azimuth calculator configured to generate a location information azimuth angle by use of the information about locations of the communication system and a receiving vehicle, and a fake vehicle generated by the communication system; and a location information fake detector configured to determine whether location information of the fake vehicle is faked by use of a difference value between an angle corresponding to a reference axis of the location information azimuth angle and the location information azimuth angle.

Example techniques relate to playback based on acoustic signals in a system including a first network device and a second network device. A first network device may detect a presence of a user using a camera and/or infrared sensors. The first network device sends, in response to detecting the presence of the user, a particular signal via the first network interface. The second network device receives data corresponding to the particular signal and plays back an audio output corresponding to the particular signal.

The invention relates to a method for determining features of an electromagnetic wave received by a reception system (22), the reception system (22) comprising at least two reception channels (13), each reception channel (13) comprising an antenna (21) and a reception chain (14), each reception chain (14) being capable of delivering a value representative of the power delivered by the corresponding antenna (21) after reception of the wave by the reception system (22), the features comprising at least the direction of arrival of the received wave, the method comprising a step of providing a measurement vector, the method further comprising the following steps: comparing the measurement vector to calibration vectors, and determining features of the received wave from the result of the comparison.

A system and method of the disclosure relates to satellite tracking. The system may comprise a tracking receiver that includes a first analog-to-digital (A/D) converter coupled between a sum input and a digital signal processor (DSP), a second A/D converter coupled between a difference input and the DSP, and a calibration output coupled to the sum input and coupled to the difference input. The first A/D converter may convert an signal received at the sum input into a sum digital signal, and provide the sum digital signal to the DSP. The second A/D converter may convert an signal received at the difference input into a difference digital signal, and provide the difference digital signal to the DSP. The tracking receiver may generate an calibration signal and provide the calibration signal through the calibration output.

A measurement method for measuring millimeter wave (mm-wave) signal and device using the method includes a first measuring device receiving a mm-wave signal by an array antenna at a first angle of arrival corresponding to a position of the first measuring device, the mm-wave signal being sent by a second measuring device at a first angle of departure. Thereby, a downlink between the first measuring device and the second measuring device can be established quickly. From a certain ascertainable location, the first measurement device sends the mm-wave signal by the array antenna at a second angle of departure, and the second measurement device receives the mm-wave signal at a second angle of arrival corresponding to the position of the first measuring device, thus, an uplink between the first measuring device and the second measuring device can be established quickly.

In accordance with example embodiments of the invention there is at least a method and apparatus to perform at least detecting, by an unmanned vehicle of a communication network, a radio connection quality degradation at the unmanned vehicle; and in response to the detecting, autonomously directing the unmanned vehicle on a rescue movement path to new geographical coordinates provided by the communication network to maintain or reestablish the radio connection. Further, to perform determining that a radio connection quality degradation is to occur or has occurred at an unmanned vehicle of a communication network; and based on the determining, providing a rescue movement path to new geographical coordinates to the unmanned vehicle for a radio connection quality degradation to maintain or reestablish the radio connection.

A system and method that can determine the direction of origin within 360 degrees around an antenna array for an emitted signal with a high degree of accuracy, even when the array is installed in a corrupted or unclean environment. Further, the provided system and method can provide a more accurate indication of direction despite polarization of the detected signal. Finally, the provided system and method can provide accurate results from phase measurements, amplitude measurements, or both phase and amplitude measurements, from an emitted signal where a phase network can be used to tailor the amplitude and phase variations versus spatial angle to best match the receiver measurement accuracies.

Example techniques relate to adjusting playback settings based on listener location. An example implementation involves a playback device receiving instructions to play back audio content in the first zone and first location data indicating first locations of one or more users relative to the first zone. The playback device determines that one or more location-based listener preferences are set in the media playback system and generates a sound field in the listening environment according to the location-based listener preferences and the first locations of the one or more users relative to the first zone. The playback device receives second location data indicating second locations of one or more users relative to the first zone and modifies the sound field in the listening environment according to the location-based listener preferences and the second locations of the one or more users relative to the first zone.