The present disclosure describes apparatuses and methods of performance-based antenna selection for user devices. In some aspects, a user device includes a transceiver having a first receiver, as well as second and third receivers. The transceiver is coupled to a first antenna to enable communication via the first antenna and the second receiver is coupled to the second antenna to enable reception via the second antenna. The third receiver is coupled to a third antenna to enable monitoring of performance of the third antenna. Based on a comparison of respective performance of the first antenna and the third antenna, the first antenna or third antenna is coupled the transceiver to enable subsequent communication. By monitoring and comparing respective performance of the antennas before antenna switching is implemented, a better-performing antenna of the two antennas can be selected for coupling to the transceiver without impacting communication performance.

This application provides a data transmission method and network device. The method includes: receiving first feedback information that is sent by each terminal and that includes a first antenna mode of the terminal; categorizing the at least two terminals into M groups based on the first antenna mode of each terminal; sending, by the network device, a second training frame to each terminal in each group, receiving second feedback information that is sent by each terminal in each group and that includes a second antenna mode of the terminal; regrouping, by the network device, the terminals in each group based on the second antenna mode of each terminal in the group, and determining an antenna mode of each group obtained through the regrouping; and sending, by the network device, first downlink data to each terminal based on the antenna mode of each group, where the first downlink data includes a superposition of first data of all the terminals in the group.

The present disclosure relates to an electronic device. The electronic device includes an electronic device body; an external antenna; and a built-in antenna, wherein the built-in antenna is disposed inside the electronic device body, and the external antenna is connected to the electronic device body via an interface of the electronic device body.

A method and an apparatus for acquiring channel information in a polarization division duplex system. An uplink signal transmitted from a terminal is received, the uplink signal indicating that a null subcarrier is disposed in a first subcarrier overlapped with a second subcarrier including a downlink pilot signal, and a self-interference channel is estimated by using a signal received from the null subcarrier. A signal corresponding to the null subcarrier from the uplink signal is removed, and channel information is acquired by estimating the uplink channel based on estimation results of the self-interference channel and a pilot signal included in the uplink signal from which the null subcarrier is removed.

A method of dynamically optimizing antenna performance in a wireless sensor network is set forth, comprising scanning multiple frequency bands via successive ones of a plurality of antennae for receiving indications of signal strength at each antenna for each scanned frequency band; and selecting one of said plurality of antennae having highest signal strength over one of said multiple frequency bands for communication over said one of said multiple frequency bands.

Methods and apparatus are provided. In an example aspect, a method in an antenna apparatus is provided. The antenna apparatus comprises an antenna array comprising a plurality of antennas. The method comprises comparing output of a first antenna of the plurality of antennas with a threshold based on output of at least one other antenna of the plurality of antennas, and based on the comparing, selectively combining the output of the first antenna with the output of the other antennas of the plurality of antennas to provide a combined signal.

A transceiver includes: a plurality of antennas that performs communication with one or more first communication apparatuses serving as reference at the time of forming a communication area and a second communication apparatus located near the one or more first communication apparatuses; a channel estimation unit configured to perform channel estimation for each of the one or more first communication apparatuses based on a known reference signal transmitted from the one or more first communication apparatuses; and an antenna control unit configured to control the plurality of antennas using an estimation value obtained by the channel estimation to form a beam having directivity in a direction in which the one or more first communication apparatuses are located. According to the control of the antenna control unit, the plurality of antennas forms a transmission beam in a communication area formed in a predetermined range including the one or more first communication apparatuses or forms a reception beam for receiving a signal transmitted from the second communication apparatus located in the communication area.

Methods, systems, and devices for wireless communications in millimeter wave (mmW) systems are described. A mmW wireless device may identify a plurality of subsets of antennas from available antennas. The wireless device may compare effective array gain values for each subset in the plurality of subsets of antennas. An effective array gain value may be determined based on a realized array gain for each subset normalized or penalized by a radio frequency (RF) power consumption for antennas corresponding to each subset in the plurality of subsets of antennas. Based on the comparison, the wireless device may select one or more subsets of the plurality of subsets of antennas, the selected one or more subsets may correspond to antenna combinations of one or more antenna subarray units. The mmW wireless device may then communicate using the selected one or more subsets.

An unmanned aerial vehicle (UAV) includes an antenna assembly configured to communicate with a ground terminal controller, a memory storing antenna assembly configuration information, and one or more processors configured to adjust a radiation direction pattern of the antenna assembly according to the antenna assembly configuration information.

The present disclosure describes apparatuses and methods of performance-based antenna selection for user devices. In some aspects, a user device includes a transceiver having a first receiver, as well as second and third receivers. The transceiver is coupled to a first antenna to enable communication via the first antenna and the second receiver is coupled to the second antenna to enable reception via the second antenna. The third receiver is coupled to a third antenna to enable monitoring of performance of the third antenna. Based on a comparison of respective performance of the first antenna and the third antenna, the first antenna or third antenna is coupled the transceiver to enable subsequent communication. By monitoring and comparing respective performance of the antennas before antenna switching is implemented, a better-performing antenna of the two antennas can be selected for coupling to the transceiver without impacting communication performance.