Methods, systems, and devices for wireless communications are described. A base station may transmit, to a user equipment (UE), a control message that includes an identification of a set of protection levels corresponding to different degrees of physical layer security for securing communications between the UE and the base station. The base station may transmit, to the UE, an indication of an identified protection level of the set of protection levels to be used by the UE for securing the communications between the UE and the base station. The UE may communicate with the base station in accordance with the identified protection level.

An acoustic sensor is positioned in an environment and configured to generate a data stream responsive to acoustic energy in the environment. A controller is configured to receive the data stream. The controller is further configured to analyze the data stream to determine ambient acoustic signals. The controller is further configured to generate an ambient acoustic template based on the determined ambient acoustic signals. The controller is further configured to apply the ambient acoustic template to the data stream so that the ambient acoustic signals are suppressed in the data stream. The controller is further configured to analyze the data stream after the ambient acoustic signals are suppressed in order to determine if the acoustic energy in the environment includes acoustic energy of human snoring. The controller is further configured to issue a control signal to a second controller in order to engage a home automation device.

An acoustic sensor is positioned in an environment and configured to generate a data stream responsive to acoustic energy in the environment. A controller is configured to receive the data stream. The controller is further configured to analyze the data stream to determine ambient acoustic signals. The controller is further configured to generate an ambient acoustic template based on the determined ambient acoustic signals. The controller is further configured to apply the ambient acoustic template to the data stream so that the ambient acoustic signals are suppressed in the data stream. The controller is further configured to analyze the data stream after the ambient acoustic signals are suppressed in order to determine if the acoustic energy in the environment includes acoustic energy of human snoring. The controller is further configured to issue a control signal to a second controller in order to engage a home automation device.

A communication apparatus includes a reference signal generating section, a transmitting section, a propagation estimating section, a first data acquiring section, and a decoding section. The reference signal generating section generates a first reference signal to enable a communicating party to estimate a propagation environment. The transmitting section transmits the first reference signal. The propagation estimating section estimates a first propagation estimation value of the propagation environment using a second reference signal transmitted from the communicating party. The first data acquiring section generates first data using the first propagation estimation value. The decoding section decodes a transmission signal encoded using a second propagation estimation value that is estimated by the communicating party using the first reference signal, to obtain second data using the first data.

A communication apparatus includes a reference signal generating section, a transmitting section, a propagation estimating section, a first data acquiring section, and a decoding section. The reference signal generating section generates a first reference signal to enable a communicating party to estimate a propagation environment. The transmitting section transmits the first reference signal. The propagation estimating section estimates a first propagation estimation value of the propagation environment using a second reference signal transmitted from the communicating party. The first data acquiring section generates first data using the first propagation estimation value. The decoding section decodes a transmission signal encoded using a second propagation estimation value that is estimated by the communicating party using the first reference signal, to obtain second data using the first data.

Methods, systems, and devices for wireless communications are described that may enable a user equipment (UE) or base station (e.g., a next-generation NodeB (gNB)) to identify that a waveform to be generated for a scheduled transmission is formed by one or more reference signal symbols and one or more data symbols. The waveform may be contained between a beginning boundary and an ending boundary with a duration equal to a total length of the one or more reference signal symbols and the one or more data symbols. The UE, base station, or both may generate the waveform by inserting a guard internal in the one or more reference signal symbols and the one or more data symbols to enable a receiver to perform a fast Fourier transform (FFT) for each of the one or more reference signal symbols and the one or more data symbols.

Techniques and mechanisms for exchanging encrypted communications wirelessly with an accommodation-capable eye-mountable device (EMD). In an embodiment, a controller of the EMD is configured to encrypt data to be sent from the EMD to an auxiliary device or to decrypt data received by the EMD from the auxiliary device. Cryptographic operations to securely exchange the communications are based on a key value and a vector determined at the EMD. In another embodiment, the auxiliary device operates as a master, and the EMD operates as a slave, at least with respect to enablement of a functionality of the EMD to change an association of a cryptographic key value with a vector.

The concepts, systems and methods described herein are directed towards encrypting optical signals prior to the optical signals being sensed, for example, by a sensor. An optical phased array (OPA) may be disposed between an optical chain and a sensor to encrypt an optical signal being sensed before the signal is received at the sensor. The method includes receiving an optical signal having a plurality of beams organized in a first arrangement at an optical phased array, encrypting the optical signal in the optical phased array by steering or otherwise phase shifting the plurality of beams from the first arrangement to a second arrangement, transmitting the plurality of beams in the second arrangement from the optical phased array to a sensor and sensing the encrypted optical signal having the plurality of beams in the second arrangement at the sensor.

The concepts, systems and methods described herein are directed towards encrypting optical signals prior to the optical signals being sensed, for example, by a sensor. An optical phased array (OPA) may be disposed between an optical chain and a sensor to encrypt an optical signal being sensed before the signal is received at the sensor. The method includes receiving an optical signal having a plurality of beams organized in a first arrangement at an optical phased array, encrypting the optical signal in the optical phased array by steering or otherwise phase shifting the plurality of beams from the first arrangement to a second arrangement, transmitting the plurality of beams in the second arrangement from the optical phased array to a sensor and sensing the encrypted optical signal having the plurality of beams in the second arrangement at the sensor.

Methods, systems, and devices for wireless communications are described. A base station may transmit, to a user equipment (UE), a control message that includes an identification of a set of protection levels corresponding to different degrees of physical layer security for securing communications between the UE and the base station. The base station may transmit, to the UE, an indication of an identified protection level of the set of protection levels to be used by the UE for securing the communications between the UE and the base station. The UE may communicate with the base station in accordance with the identified protection level.