A method for pilot configuration includes: a base station configuring K1 sets of pilot resources of a first type and K2 sets of pilot resources of a second type; the base station transmitting the K1 sets of pilot resources of the first type to a terminal in a first transmission mode, and transmitting the K2 sets of pilot resources of the second type to the terminal in a second transmission mode; and the base station receiving a first type of feedback information fed back by the terminal according to the measurement of the pilot resources of the first type, and receiving a second type of feedback information fed back by the terminal according to the measurement of the pilot resources of the second type, wherein K1 and K2 are integers equal to or greater than 1.

Various examples are provided related to hybrid multiple-input/multiple-output (MIMO) architectures. Beam steering can be provided using lens arrays. In one example, a hybrid antenna system includes a plurality of lens antenna subarrays (LAS), each of the LAS including a plurality of antenna elements configured to selectively receive a radio frequency (RF) transmission signal from RF processing circuitry, and a lens extending across the plurality of antenna elements. The RF transmission signal can be provided to a selected antenna of the plurality of antenna elements via a switching network and a common phase shifter for transmission. The lens can be configured to steer a RF transmission generated by the selected antenna in a defined direction. The selected antenna can be determined by the switching network configuration.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may establish a first communication link using a first radio access technology (RAT). The UE may establish a second communication link using a second RAT. The UE may determine whether to prioritize antenna selection for the first communication link using the first RAT or the second communication link using the second RAT. The UE may prioritize antenna selection for the first communication link or the second communication link based at least in part on the determination. Numerous other aspects are provided.

A method for allocating available transceiver resources across different component carriers (CC) includes obtaining a carrier aggregation capability that includes a list of available CCs supported by the UE at a current location for simultaneous communication with a carrier aggregation capable network. The method also includes, for each of the available CCs, obtaining an expected key performance indicator (KPI) associated with the corresponding available CC at the current location. The method also includes allocating the available transceiver resources across the available CCs based on the expected KPIs at the current location.

The disclosure relates to techniques for beamforming in multi-user systems. The disclosure particularly relates to a base station for communication with multiple user terminals, the base station comprising: a digital precoder and an analog precoder which are configured to precode a first training signal; a radio transceiver configured to transmit the precoded first training signal and to receive a precoded second training signal upon transmission of the precoded first training signal; and a controller configured to adjust a precoding of the digital precoder based on processing of the second training signal with respect to a normalization criterion and to adjust a precoding of the analog precoder based on processing of the second training signal with respect to a multi-user beamforming criterion.

Carrier aggregation circuit having multi-stage filter combination. In some embodiments, a carrier aggregation circuit can include a first combining stage configured to aggregate a first signal in a first path associated with a first band and a second signal in a second path associated with a second band to provide a first aggregated signal in a first combined path. The carrier aggregation circuit can further include a second combining stage configured to aggregate the first aggregated signal in the first combined path and a third signal in a third path associated with a third band to provide a second aggregated signal in a second combined path.

A wireless communication system includes: a plurality of base stations wirelessly connected to a relay station; and the relay station comprising: a multi-element antenna including a plurality of antenna elements, wherein, among the plurality of antenna elements, a first antenna element is wirelessly connected to a first base station of the plurality of base stations, and a second antenna element is wirelessly connected to a second base station of the plurality of base stations; and a controller that switches at least one of the first antenna element and the second antenna element so as to be wirelessly connected to another base station of the plurality of base stations in response to an occurrence of an event.

Methods and apparatuses for hybrid beamforming are described. The described methods and apparatuses related to hybrid beamforming for single user multiple-input multiple-output (SU MIMO) communications and for multi-user multiple-input single-output (MU MISO) communications. The radio frequency (RF) precoder and baseband precoder are determined such that the hybrid precoder has a minimum or near minimum chordal distance from an optimal precoder. Feedback information enables the transmitter to select columns from a set of discrete Fourier transform (DFT) columns to form the RF precoder matrix.

A radio system for radio communication comprises at least two antennas that are spaced from each other by a distance. The distance is set to enable independent transmission or reception of radio signals via the at least two antennas. The system comprises a selection module configured to select at least one of the at least two antennas for radio transmission and/or radio reception.

A wireless communication method includes: storing antenna-pair set information and a first measurement result in association with each other for every positional-arrangement, the antenna-pair set information being information on a set of pairs of transmission antennas and reception antennas that achieves a best throughput for the positional-arrangement, the first measurement result being a measurement result of reception characteristics of a training signal transmitted from at least one of the plurality of transmission antennas; selecting current antenna-pair set information corresponding to a current positional-arrangement by comparing a second measurement result with the first measurement result stored, the second measurement result being a measurement result of reception characteristics of the training signal measured at the plurality of reception antennas in the current positional-arrangement; and establishing links between the plurality of transmission antennas and the respective plurality of reception antennas based on the current antenna-pair set information corresponding to the current positional-arrangement.