Abstract: An embodiment of the present application relate to the technical field of an unmanned aerial vehicle, in particular to an unmanned aerial vehicle and a pairing method and system thereof. The method includes establishing a master pairing relationship between a master controller and an unmanned aerial vehicle via pairing information transmitted by the master controller; receiving a slave pairing request forwarded by the master controller, generating temporary pairing information, and transmitting the temporary pairing information to the master controller, and transmitting the slave pairing request to the master controller; acquiring the temporary pairing information transmitted by the slave controller after the master controller transmits the temporary pairing information to the slave controller, and establishing a slave pairing relationship between the slave controller and the unmanned aerial vehicle according to the temporary pairing information transmitted by the slave controller.

Abstract: Device and methods for real-time polarization-dependent loss monitoring at coherent transceivers. In one embodiment, there is provided a method of monitoring a polarization dependent loss (PDL) of a signal during transmission through an optical communication link, the method comprising: receiving the signal by a coherent receiver, the received signal being subjected to one or more impairments in Amplifier Gain Control (AGC) mode, the one or more impairments including PDL; estimating an AGC gain effect of the AGC mode; compensating for the AGC gain effect in the received signal; determining the PDL from the compensated signal; and reporting the PDL.

Abstract: A method for determining a working frequency point includes: each measurement period and each frequency point to be measured in each measurement period are acquired; whether a present moment is a first scheduling slice of a present measurement period is judged; if YES, frequency point switching and measurement are sequentially performed to obtain a Received Signal Strength Indication (RSSI) value of each frequency point to be measured in the present measurement period, frequency point switching back to a present working frequency point is performed, and the judging is re-executed until an RSSI value of each frequency point to be measured in each measurement period is measured; if NO, the judging is re-executed; and a working frequency point is redetermined according to a relationship between the RSSI value of each frequency point to be measured in each measurement period and an interference value of the present working frequency point.

Abstract: Provided is a synchronization method, which includes: a first device periodically sends a first PSS sequence and first PDSCH control information at frequency points F1 to FN in sequence, where the first PSS sequence and the first PDSCH control information are used for a second device to detect the first PSS sequence and detect the first PDSCH control information; the first device receives signals at frequency points f1 to fM in sequence and detects a second PSS sequence; when the second PSS sequence is detected, the first device obtains second half-frame synchronization information and detects second PDSCH control information according to the second half-frame synchronization information; and when the second PDSCH control information is detected, the first device obtains second frame synchronization information and enters a synchronization state. Also provided are a synchronization device, a synchronization system, and a computer-readable storage medium.

Abstract: The disclosure discloses a synchronization method, which includes: sending first synchronization information carrying a Synchronization Signal (SS) and state information; receiving second synchronization information sent by a third terminal based on the first synchronization information after a first terminal has received synchronization information sent by a second terminal; under a condition the state information sent by the third terminal indicates that the third terminal enters a pre-synchronization state, determining receiving time information of the third terminal according to time domain resources used by transmission of the first synchronization information and receiving time information of the second terminal; sending third synchronization information, where the third synchronization information is used to trigger the third terminal to be synchronized with the first terminal; and synchronizing the first terminal with the third terminal according to the receiving time information of the third terminal

Abstract: A method for determining a working frequency point includes: each measurement period and each frequency point to be measured in each measurement period are acquired; whether a present moment is a first scheduling slice of a present measurement period is judged; if YES, frequency point switching and measurement are sequentially performed to obtain a Received Signal Strength Indication (RSSI) value of each frequency point to be measured in the present measurement period, frequency point switching back to a present working frequency point is performed, and the judging is re-executed until an RSSI value of each frequency point to be measured in each measurement period is measured; if NO, the judging is re-executed; and a working frequency point is redetermined according to a relationship between the RSSI value of each frequency point to be measured in each measurement period and an interference value of the present working frequency point.

Abstract: Provided is a synchronization method, which includes: a first device periodically sends a first PSS sequence and first PDSCH control information at frequency points F1 to FN in sequence, where the first PSS sequence and the first PDSCH control information are used for a second device to detect the first PSS sequence and detect the first PDSCH control information; the first device receives signals at frequency points f1 to fM in sequence and detects a second PSS sequence; when the second PSS sequence is detected, the first device obtains second half-frame synchronization information and detects second PDSCH control information according to the second half-frame synchronization information; and when the second PDSCH control information is detected, the first device obtains second frame synchronization information and enters a synchronization state. Also provided are a synchronization device, a synchronization system, and a computer-readable storage medium.