A wireless communication device includes a transmitter that is provided in a rotary part of a rotary device and transmits a wireless signal; a receiver that is provided in a stationary part of the rotary device, receives the wireless signal, and calculates a communication quality level based on the wireless signal; and processing circuitry to determine a communication cycle based on the communication quality level so that the communication cycle synchronizes with a cycle as a multiple of a rotation cycle of the rotary part by an integer greater than or equal to 1, and to make timing of the communication between the transmitter and the receiver follow the rotation cycle by increasing or decreasing the communication cycle so that the communication quality level increases.

A wireless communication device includes a transmitter that is provided in a rotary part of a rotary device and transmits a wireless signal; a receiver that is provided in a stationary part of the rotary device, receives the wireless signal, and calculates a communication quality level based on the wireless signal; and processing circuitry to determine a communication cycle based on the communication quality level so that the communication cycle synchronizes with a cycle as a multiple of a rotation cycle of the rotary part by an integer greater than or equal to 1, and to make timing of the communication between the transmitter and the receiver follow the rotation cycle by increasing or decreasing the communication cycle so that the communication quality level increases.

A terminal to be installed in a machine having rotor blades in a communication system in which the terminal and a base station transmit and receive data via a relay station to and from each other, includes a rotor blade state monitoring unit that monitors a rotor blade state by measuring the timing at which the rotor blades block a communication path in midair between the relay station and the terminal, and a transceiver that transmits the rotor blade state to the base station and transmit the data using radio resources allocated by the base station.

A terminal to be installed in a machine having rotor blades in a communication system in which the terminal and a base station transmit and receive data via a relay station to and from each other, includes a rotor blade state monitoring unit that monitors a rotor blade state by measuring the timing at which the rotor blades block a communication path in midair between the relay station and the terminal, and a transceiver that transmits the rotor blade state to the base station and transmit the data using radio resources allocated by the base station.

A maintenance control program for use in maintaining mechanical and electro-mechanical equipment is provided. The maintenance control program includes a completed survey of the mechanical and electro-mechanical equipment. The completed survey is configured to document the physical characteristics of the mechanical and electro-mechanical equipment and an assessment of a plurality of metrics concerning the mechanical and electro-mechanical equipment. An algorithm is configured to apply values to the assessment of the plurality of metrics. A schedule of code required maintenance tasks is developed for the mechanical and electro-mechanical equipment, wherein an interval of the required maintenance tasks is determined by the algorithm based on the values applied to the assessment of the plurality of metrics.

According to the present invention, in a wireless communication system that performs single carrier MIMO transmission between a transmitting station device and a receiving station device, the transmitting station device includes a time-domain linear equalization unit, a propagation path characteristics estimation unit configured to receive a training signal and estimate a transfer function matrix of propagation path characteristics, a filter tap calculation unit configured to calculate filter tap coefficients for the time-domain linear equalization unit based on the transfer function matrix by a predefined approach, and a transmission mode determination unit configured to make the filter tap calculation unit calculate the filter tap coefficients when the transfer function matrix meets a predefined condition, and to change a transmission mode and determine the transmission mode that meets the predefined condition when the transfer function matrix does not meet the predefined condition. The receiving station device includes a training signal generation unit configured to generate the training signal for use in estimation of propagation path characteristics and transmit the training signal to the transmitting station device.

According to the present invention, in a wireless communication system that performs single carrier MIMO transmission between a transmitting station device and a receiving station device, the transmitting station device includes a time-domain linear equalization unit, a propagation path characteristics estimation unit configured to receive a training signal and estimate a transfer function matrix of propagation path characteristics, a filter tap calculation unit configured to calculate filter tap coefficients for the time-domain linear equalization unit based on the transfer function matrix by a predefined approach, and a transmission mode determination unit configured to make the filter tap calculation unit calculate the filter tap coefficients when the transfer function matrix meets a predefined condition, and to change a transmission mode and determine the transmission mode that meets the predefined condition when the transfer function matrix does not meet the predefined condition. The receiving station device includes a training signal generation unit configured to generate the training signal for use in estimation of propagation path characteristics and transmit the training signal to the transmitting station device.

Methods, systems, and devices for wireless communications are described. In some examples, a base station and a user equipment (UE) may utilize multi-port reference signals to determine a beam pair for rank-2 transmissions. For example, a UE may receive a set of multi-port reference signals, where each multi-port reference signal of the set corresponds to a unique beam pair and is received via two ports associated with two different polarizations. The UE may determine a spectral efficiency estimation for each multi-port reference signal of the set, select a beam pair associated with a multi-port reference signal with the highest determined spectral efficiency estimation of the set, and transmit an indication of the selected beam pair to the base station. Therefore, the UE and the base station may communicate using a beam pair which maximizes the spectral efficiency and rate of rank-2 transmissions.

Methods, systems, and devices for wireless communications are described. In some examples, a base station and a user equipment (UE) may utilize multi-port reference signals to determine a beam pair for rank-2 transmissions. For example, a UE may receive a set of multi-port reference signals, where each multi-port reference signal of the set corresponds to a unique beam pair and is received via two ports associated with two different polarizations. The UE may determine a spectral efficiency estimation for each multi-port reference signal of the set, select a beam pair associated with a multi-port reference signal with the highest determined spectral efficiency estimation of the set, and transmit an indication of the selected beam pair to the base station. Therefore, the UE and the base station may communicate using a beam pair which maximizes the spectral efficiency and rate of rank-2 transmissions.

Antenna beam sweeping according to the present disclosure involves different communication devices that are within an interference range of each other transmitting beam sweeping signals using different communication resources. This allows a receiver to distinguish between beam sweeping signals that are received from different transmitters, and may facilitate antenna beam alignment in multi-connection scenarios. Beam indices could be used to identify antenna beams for antenna beam management, in control signaling between base stations and User Equipment (UE), for example. Beam tracking and other aspects of antenna beam management are also disclosed.