Abstract: This application discloses a multi-antenna system and a wireless communication device. The multi-antenna system includes a first antenna, a second antenna. A first extension branch is close to the second antenna, and a second extension branch is close to the first antenna. A feed of the first antenna is disposed on the first radiator, and a feed of the second antenna is disposed on a second radiator. A feed of the third antenna is disposed at the first extension branch. There is a spacing between the first extension branch and the second extension branch. An equivalent circuit of the spacing includes a distributed capacitor. The distributed capacitor is configured to isolate signal coupling between the first antenna and the second antenna when a first resonant frequency of the first antenna and a second resonant frequency of the second antenna are within a preset frequency range.

Abstract: This application provides a link failure recovery method and apparatus. A terminal is configured to send first request information to a network device on the same resource (namely, a first resource) when detecting that a link of any one of a plurality of cells fails or the links of more than one of the plurality of cells fail, to notify the network device that a link of at least one of the cells fails. In this way, in a multi-carrier scenario resource overheads are reduced as compared to the solution of using separate resources to notify link failures in multiple cells.

Abstract: An iridium complex for an organic light-emitting device includes the chemical structural formula shown below, where the ring A is selected from C12-C30 polycyclic groups formed by fusing three or more monocyclic groups with each other, and the precondition is that the ring A at least includes the structure of general formula II: R1-R5 are the same or different, and each independently is H, deuterium, halogen, —CF3, CN, amino, substituted or unsubstituted C1-C10 alkoxyl, or substituted or unsubstituted C1-C30 alkyl, hydrogens on the alkyl chain of the C1-C10 alkoxyl and C1-C30 alkyl may each be independently substituted by deuterium, halogen, —CF3 or CN, where the halogen is selected from fluorine, chlorine, bromine or iodine; Rx and Ry are the same or different, and each independently includes saturated aliphatic ring structure. The iridium complex has excellent red-light saturation, luminous efficiency and thermal stability.

Abstract: A cooperative control method and system for electro-hydraulic hybrid braking of a middle-low speed maglev train is provided, which relates to the field of vehicle braking control. The method includes: denoising operation data of a middle-low speed maglev train; using a controlled autoregressive integrated moving average model as an electro-hydraulic hybrid braking process model for the middle-low speed maglev train, and processing denoised operation data by using a least square method to determine parameters in the controlled autoregressive integrated moving average model; establishing a generalized predictive control model with time lag compensation according to the controlled autoregressive integrated moving average model and a Smith predictor; and performing cooperative control on an electro-hydraulic hybrid braking process of the middle-low speed maglev train by using the generalized predictive control model with time lag compensation.

Abstract: An antenna combination system and a terminal device. The antenna combination system includes a first antenna and a second antenna having a distance less than a first preset threshold. The first antenna includes a first radiation branch and a first feed point, a feed point of the second antenna is arranged on a side away from the first feed point, and a side of the first radiation branch away from the first feed point is grounded. The first feed point is arranged on a side close to the second antenna, and the length of the first radiation branch is an odd multiple of (½)?. In a case that the second antenna transmits a signal in a first frequency band, a first signal and a second signal that cancel each other are coupled from the second antenna to the first antenna.

Abstract: Embodiments of this application provide a communication method and a related device. The method includes: A terminal device obtains a plurality of power offset values corresponding to one reference signal resource, determines a plurality of pieces of channel state information CSI based on the plurality of offset values, and sends some or all of the plurality of pieces of CSI to a network device. The network device may flexibly adjust data transmit power based on the plurality of power offset values and the plurality of pieces of corresponding CSI, and perform appropriate link adaptation adjustment.

Abstract: Embodiments of this application provide a low-SAR antenna and an electronic device, which relates to the field of electronic devices and can provide good radiation performance at middle/high frequencies and have a low SAR value. The specific solution is as follows. A first radiation structure includes a first radiator, and a second radiation structure includes a second radiator. A first end of the first radiator and a first end of the second radiator form a first gap. A second end of the first radiator is free, and a second end of the second radiator is grounded. A feed point of the antenna is coupled to the first radiator, and the first radiator is divided into a first portion and a second portion that are delimited by the feed point. In a case that the antenna is in operation, the first portion of the first radiator and the second radiator work together in a first frequency band and a second frequency band, and a frequency of the first frequency band is less than a frequency of the second frequency band.

Abstract: Embodiments of the present invention disclose a communication method and a device. Configuration information indicating one or more spatial domain beam basis vector groups and Q thresholds is received from a network device, where the Q thresholds correspond one-to-one to spatial domain beam basis vectors in the one or more spatial domain beam basis vector groups. L spatial domain beam basis vectors are selected from a spatial domain beam basis vector group set. K frequency domain basis vectors are selected from a frequency domain basis vector set for each of the L spatial domain beam basis vectors.

Abstract: A channel state information transmission method and apparatus. The method includes: receiving N reference signal groups, where N is an integer greater than or equal to 2; and sending channel state information, where the channel state information includes a first resource index, a second resource index, and first channel quality information, the first resource index is a resource index of a first reference signal, the second resource index is a resource index of a second reference signal, the first reference signal and the second reference signal are reference signals in different groups in the N reference signal groups.

Abstract: This application provides a channel state information measurement method, to enable a network device to dynamically adjust a quantity of transmit channels, thereby reducing energy consumption of the network device. The network device sends reference signal resource configuration information to a terminal device, where the reference signal resource configuration information indicates P antenna ports. The terminal device measures CSI based on one or more proper subsets of antenna ports in a universal set of the P antenna ports, and sends the CSI to the network device. The network device can dynamically adjust the quantity of transmit channels based on different dimensions of channel state information reported by the terminal device, thereby reducing energy consumption of the network device.

Abstract: This application provides a communications method and apparatus, to improve uplink transmission performance. The method includes determining, by a terminal device, capability indication information and sending the capability indication information to a network device. The capability indication information is used to determine a power scaling factor, the power scaling factor is a ratio of a sum of actual transmit power of n non-zero antenna ports to channel transmit power, and a maximum value of the channel transmit power is a rated maximum transmit power of a system.

Abstract: The embodiment of this specification discloses a method and system for determining parameters of audio devices, the method includes: obtaining at least one of image information and/or audio information of a target space where a target audio device is located; and determining a parameter of the target audio device based on the at least one of image information and/or the audio information.

Abstract: A network data packet filtering method includes receiving a network data packet, obtaining a communication 5-tuple in the network data packet through parsing, determining, by determining that the communication 5-tuple in the network data packet matches at least one of one or more communication 5-tuple entries, that the network data packet is a broadcast data packet to be discarded, and discarding the broadcast data packet.

Abstract: A method for parallel processing of retinal images includes: optimizing an objective function with a chaotic supply-demand algorithm to enhance a real retinal image; synthesizing a virtual retinal image by a hybrid image generation method; establishing a parallel multi-layer decomposed interval type-2 intuitionistic fuzzy convolutional neural network model based on the virtual retinal image and the enhanced real retinal image; and integrating outputs from a plurality of parallel multi-layer decomposed interval type-2 intuitionistic fuzzy convolutional neural network models as a final classification result.

Abstract: This application provides a terminal device and a wireless communications method. When the terminal device is in a dual connectivity network including an LTE link and an NR link, the terminal device determines, based on a service transmission rate related to an actual transmission rate, whether to disconnect the NR link. If the service transmission rate is relatively low, the terminal device disconnects the NR link. If the service transmission rate is relatively high, the terminal device does not disconnect a first link, and uses both the NR link and the LTE link for communication. In this way, power consumption of the terminal device can be effectively reduced without affecting the user experience on transmission rate, the user experience on power consumption is improved, and the user experiences on transmission rate and power consumption are balanced to some extent.

Abstract: The embodiment of this specification discloses a method and system for determining parameters of audio devices, the method includes: obtaining at least one of image information and/or audio information of a target space where a target audio device is located; and determining a parameter of the target audio device based on the at least one of image information and/or the audio information.

Abstract: An intelligent layout design method of curvilinearly stiffened structure based on image feature learning. Firstly, the design variables of the curvilinearly stiffened structure are determined based on the path function. The autoencoder network is built to complete the learning of the structural characteristics of the image, and the transfer learning of the model is further carried out. The convolution neural network is built to complete the learning of the image set with mechanical response labels. Finally, the evolutionary algorithm is used to optimize the layout of the curvilinearly stiffened structure based on the model. The invention solves the problem that the traditional optimization method is difficult to deal with the optimization design with many and variable design variables, and is expected to become one of the most potential technical means involved in the layout design of components in the engineering field.

Abstract: Methods, devices and systems for increasing wireless communication range are provided. A device includes a reconfigurable antenna system having a plurality of antenna configurations; an antenna logic system configured to select one of the antenna configurations based on signal strength indicators of the plurality of antenna configurations; and a radio frequency (RF) transceiver configured to communicate with a client device using the selected antenna configuration.

Abstract: A method for parallel processing of retinal images includes: optimizing an objective function with a chaotic supply-demand algorithm to enhance a real retinal image; synthesizing a virtual retinal image by a hybrid image generation method; establishing a parallel multi-layer decomposed interval type-2 intuitionistic fuzzy convolutional neural network model based on the virtual retinal image and the enhanced real retinal image; and integrating outputs from a plurality of parallel multi-layer decomposed interval type-2 intuitionistic fuzzy convolutional neural network models as a final classification result.

Abstract: Embodiments of the present disclosure pertain to a circuit board, a display panel and a display device. The circuit board includes a ground protection circuit, disposed in a peripheral area of the circuit board. The ground protection circuit includes one or more first wires arranged in parallel, a bridging connection part and a plurality of second wires arranged in parallel, where one end of each first wire is grounded and the other end connects to the bridging connection part electrically, while one end of each second wire connects to the bridging connection part electrically and the other end is grounded. The display panel includes the circuit board and the display device includes the display panel.