Abstract: In a general aspect, a motion detection system detects gestures (e.g., human gestures) and initiates actions in response to the detected gestures. In some aspects, channel information is obtained based on wireless signals transmitted through a space by one or more wireless communication devices. A gesture recognition engine analyzes the channel information to detect a gesture (e.g., a predetermined gesture sequence) in the space. An action to be initiated in response to the detected gesture is identified. An instruction to perform the action is sent to a network-connected device associated with the space.

Abstract: In a general aspect, a method is presented for detecting a location of motion using wireless signals that propagate along two or more paths of a wireless communication channel. The method includes storing a set of eigenvectors derived from first motion-sensing data associated with a first time frame. The first motion-sensing data is associated with a first motion-sensing topology of a wireless mesh network. The method also includes obtaining a motion vector based on wireless signals transmitted between access point nodes in the wireless mesh network during a second, subsequent time frame. The wireless mesh network operates in a second, distinct motion-sensing topology during the second time frame. The motion vector is compared with the respective eigen vectors, and a probability vector is generated based on the comparison. A location of the motion of the object during the second time frame is determined based on the probability vector.

Abstract: A method includes obtaining a set of motion indicator values associated with a time frame. The set of motion indicator values indicating motion detected from wireless links in a wireless communication network during the time frame. The method also includes generating a probability vector comprising values for the connected wireless communication devices and generating spatial coordinates for respective wireless communication devices. The spatial coordinates for each wireless communication device representing a location of the wireless communication device in space. The method also includes modifying the probability vector based on the spatial coordinates of each wireless communication device to generate a modified probability vector representing a probability of motion at the connected wireless communication device during the time frame. The method also includes using the modified probability vector to localize motion relative to the wireless communication device during the time frame.

Abstract: In a general aspect, a set of observed frequency-domain channel responses is filtered to remove noise or distortions that are not related to changes in the physical environment. In some aspects, for each frequency-domain channel response, a time-domain channel response is generated based on the frequency-domain channel response; and a filtered time-domain channel response is generated based on a constraint applied to the time-domain channel response. Additionally, a reconstructed frequency-domain channel response is generated based on the filtered time-domain channel response. An error signal is also generated, and a determination is made as to whether the error signal satisfies a criterion. The error signal can be indicative of a difference between the frequency-domain channel response and the reconstructed frequency-domain channel response. In response to each of the error signals satisfying the criterion, motion of an object in a space is detected based on the set of frequency-domain channel responses.

Abstract: In a general aspect, a mobile wireless communication device is operated for motion sensing. In some aspects, wireless signals transmitted from a second wireless communication device through a space during a time period are received at a first wireless communication device. By operation of the first wireless communication device, channel state information is generated based on the wireless signals. Whether the first wireless communication device moved during the time period is detected. In response to detecting that the first wireless communication device moved relative to the second wireless communication device during the time period, motion sensing parameters of a motion sensing system are updated. The channel state information is processed according to the updated motion sensing parameters to detect motion of an object—other than the first wireless communication device—in the space during the time period.

Abstract: A method includes receiving, at a cloud-based computer system, motion data from a remote motion detection system configured to detect motion in a space. The motion data is derived from wireless signals communicated through the space by the wireless communication devices. A motion classifier is applied to the motion data by the cloud-based computer system to detect an occurrence of a first predefined motion event in the space. A subset of the third party entities that have registered for notifications associated with the first predefined motion event is identified based on reference to a database. Notifications are generated addressed to the subset of the third party entities. Each notification includes an indication that the first predefined motion event was detected and additional information describing the occurrence of the first predefined motion event. The notifications are then sent to the subset of the third party entities.

Abstract: In a general aspect, various fields of a PHY frame are used for motion detection. In some aspects, a first training field and a second, different training field are identified in a PHY frame of each wireless signal transmitted between wireless communication devices in a wireless communication network. A first time-domain channel estimate and a second time-domain channel estimate are generated for each wireless signal. The first time-domain channel estimate is based on a first frequency-domain signal included in the first training field, while the second time-domain channel estimate is based on a second frequency-domain signal included in the second training field. A determination is made whether motion has occurred in a space during the time period based on the first time-domain channel estimates, and a location of the motion within the space is determined based on the second time-domain channel estimates.

Abstract: In a general aspect, motion is detected in an environment using wireless signals. In one example, a downlink high-efficiency PHY (HE-PHY) frame is received. The downlink HE-PHY frame is transmitted by an access point device to wireless communication devices residing inside an environment. An uplink orthogonal frequency-division multiple access (UL-OFDMA) transmission is subsequently received in response to the downlink HE-PHY frame. The UL-OFDMA transmission is transmitted by the wireless communication devices to the access point device. The UL-OFDMA transmission includes uplink HE-PHY frames simultaneously transmitted on respective resource units by the respective wireless communication devices. A motion data set is generated based on channel responses computed from the uplink HE-PHY frames. Each channel response is computed from a respective one of the uplink HE-PHY frames. Motion within the environment is analyzed based on the motion data set.

Abstract: In a general aspect, a method for determining a location of motion detected by wireless communication devices in a wireless communication network includes obtaining motion data associated with a first time frame. The motion data includes a set of motion indicator values. The method also includes generating a first probability vector based on the set of motion indicator values and obtaining a second probability vector generated from motion data associated with a prior time frame. The method additionally includes obtaining a transition probability matrix that includes transition values and non-transition values. The method further includes determining, by operation of a data processing apparatus, a location of the motion detected from the wireless signals exchanged during the first time frame.

Abstract: In a general aspect, a motion sensing system is configured for operation in an environment. In some aspects, device information for a plurality of wireless communication devices available for use in the motion sensing system is obtained. The motion sensing system data are sent from the motion sensing system to a cloud-based computer system. The motion sensing system data includes the device information and environment information. In response to the motion sensing system data, health score data for the plurality of wireless communication devices are received from the cloud-based computer system. Health scores for the plurality of wireless communication devices are configured according to the health score data. Based on the health scores, a subset of the plurality of wireless communication devices are selected for motion detection. The motion sensing system is updated to use the selected subset of wireless communication devices for motion detection.

Abstract: In a general aspect, a set of observed frequency-domain channel responses is filtered to remove noise or distortions that are not related to changes in the physical environment. In some aspects, for each frequency-domain channel response, a time-domain channel response is generated based on the frequency-domain channel response; and a filtered time-domain channel response is generated based on a constraint applied to the time-domain channel response. Additionally, a reconstructed frequency-domain channel response is generated based on the filtered time-domain channel response. An error signal is also generated, and a determination is made as to whether the error signal satisfies a criterion. The error signal can be indicative of a difference between the frequency-domain channel response and the reconstructed frequency-domain channel response. In response to each of the error signals satisfying the criterion, motion of an object in a space is detected based on the set of frequency-domain channel responses.

Abstract: In a general aspect, a method for determining a location of motion detected by wireless communication devices in a wireless communication network includes obtaining motion data associated with a first time frame. The motion data includes a set of motion indicator values. The method also includes generating a first probability vector based on the set of motion indicator values and obtaining a second probability vector generated from motion data associated with a prior time frame. The method additionally includes obtaining a transition probability matrix that includes transition values and non-transition values. The method further includes determining, by operation of a data processing apparatus, a location of the motion detected from the wireless signals exchanged during the first time frame.

Abstract: In a general aspect, a plurality of motion zones are identified in a motion detection system. Each of the plurality of motion zones represents a distinct region in a space associated with a wireless communication network, and at least a subset of the motion zones are associated with respective wireless communication devices in the wireless communication network. Motion-sensing data is generated based on first wireless signals transmitted during a first time period between pairs of wireless communication devices. The motion-sensing data represents motion in the space. A new motion zone is identified based on the motion-sensing data; the new motion zone is not associated with any of the wireless communication devices. User input is received in response to a graphical representation of the new motion zone being displayed on a display device. The motion detection system is updated based on the user input.

Abstract: In a general aspect, a method of operating a motion detection system includes receiving, by operation of one or more communication interfaces, radio frequency wireless signals communicated by a plurality of wireless communication devices. The radio frequency wireless signals are processed to generate channel information. By operation of a motion detection engine of the motion detection system, generating motion data based on the channel information that includes a series of vectors in a series of time points within the time period. The motion data includes motion indicator values indicative of a degree of motion that occurred in the space and motion localization values for a plurality of locations. Processing the series of vectors includes determining an aggregate degree of motion that occurred at each of the individual locations during the time period and determining a duration of activity that occurred at each of the individual locations during the time period.

Abstract: Systems and methods for Wi-Fi sensing using UL-OFDMA are provided. Wi-Fi sensing systems include sensing devices and sensing transmitters configured to communicate through radio-frequency signals. Initially, first channel resources are allocated to first expected transmissions from the sensing transmitters and first sensing trigger message to trigger first series of sensing transmissions from the sensing transmitters is transmitted. Further, a first series of sensing transmissions is received, and the first series of sensing measurements are generated. Thereafter, identification of feature of interest is obtained and a selection of sensing transmitters is determined. Second channel resources are allocated to second expected transmissions from the selection of sensing transmitters. A second sensing trigger message to trigger a second series of sensing transmissions from the selection of the sensing transmitters is provided.

Abstract: In a general aspect, motion is detected using wireless signals. In an example, a method includes receiving, at a wireless communication device, requests for the wireless communication device to transmit wireless signals, the requests initiated by a wireless sensing system. The method further includes transmitting a series of wireless signals from the wireless communication device in response to the requests, and detecting, at the wireless communication device, a trigger event after transmitting the series of wireless signals. The method additionally includes updating, by the wireless communication device, a state of the wireless communication device based on the trigger event, the updated state indicating that the wireless communication device is not enabled to transmit wireless signals in response to the requests from the wireless sensing system. The method also includes communicating, by the wireless communication device, the updated state of the wireless communication device to the wireless sensing system.

Abstract: In a general aspect, a mobile wireless communication device is operated for motion sensing. In some aspects, wireless signals transmitted from a second wireless communication device through a space during a time period are received at a first wireless communication device. By operation of the first wireless communication device, channel state information is generated based on the wireless signals. Whether the first wireless communication device moved during the time period is detected. In response to detecting that the first wireless communication device moved relative to the second wireless communication device during the time period, motion sensing parameters of a motion sensing system are updated. The channel state information is processed according to the updated motion sensing parameters to detect motion of an object—other than the first wireless communication device—in the space during the time period.

Abstract: In a general aspect of the examples described, motion is detected based on bi-directional channel sounding. In an example, a first set of channel information is obtained from a first device. The first set of channel information is based on a first set of wireless signals transmitted from a second device through a space at a first time in a timeframe. A second set of channel information is obtained from the second device. The second set of channel information is based on a second set of wireless signals transmitted from the first device through the space at a second time in the timeframe. The first and second sets of channel information are analyzed to detect a category of motion or a location of detected motion in the space during the timeframe.

Abstract: A method includes obtaining motion data at a wireless communication device in a motion detection system. The motion data is derived from wireless signals communicated through the space by the wireless communication devices. Over a training period, the motion data is provided to a cloud-based computer system. A motion pattern detection function is received from the cloud based computer system. The motion pattern detection function corresponding to a motion event that occurred in the space during the training period. after the training period, additional motion data is obtained at the wireless communication device. The motion pattern detection function is applied to the additional motion data to detect an occurrence of the motion event in the space. A message that includes an indication of that the motion event was detected is sent from the wireless communication device to the cloud-based computer system.

Abstract: A method includes receiving, at a cloud-based computer system, motion data from a remote motion detection system configured to detect motion in a space. The motion data is derived from wireless signals communicated through the space by the wireless communication devices. A motion classifier is applied to the motion data by the cloud-based computer system to detect an occurrence of a first predefined motion event in the space. A subset of the third party entities that have registered for notifications associated with the first predefined motion event is identified based on reference to a database. Notifications are generated addressed to the subset of the third party entities. Each notification includes an indication that the first predefined motion event was detected and additional information describing the occurrence of the first predefined motion event. The notifications are then sent to the subset of the third party entities.