Methods and apparatuses for beam pattern stabilisation are provided. A method may include processing an output of a gyroscopic sensor to generate a plurality of first phase corrections for a first time interval and a plurality of second phase corrections for a second time interval. The method may further include measuring respective signal propagation characteristics between each antenna element of the array and each of a first and second subscriber module for the first time interval. The method may further include forming, based on the measured respective signal propagation characteristics, the plurality of first phase corrections, and the plurality of second phase corrections, a MU-MIMO beam pattern for the second time interval having a main lobe towards the first subscriber module and a null towards the second subscriber module, whereby to correct for a change in orientation of the array between the first time interval and the second time interval.

This application provides a data transmission method. The method may include: determining that a position of a start bit of a first bit sequence and a position of an end bit of a second bit sequence are contiguous in a coded bit sequence, where the first bit sequence is a bit sequence in first transmission, the second bit sequence is a bit sequence in second transmission, the first transmission and the second transmission carry a same transport block, and the second transmission is previous transmission of the first transmission; and receiving and/or sending the first bit sequence.

This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for collision handling. A first network node receives a first allocation of first resources at a first time and receives a second allocation of second resources at a second time, wherein the first time is before the second time, wherein one or more of the first resources overlap in a time domain and a frequency domain with one or more of the second resources, and wherein the first resources are uplink resources and the second resources are downlink resources or the first resources are downlink resources and the second resources are uplink resources. The first network node adjusts for the overlap in the time domain and the frequency domain between the first allocation of first resources and the second allocation of second resources.

In a broadband wireless communication system, a spread spectrum signal is intentionally overlapped with an OFDM signal, in a time domain, a frequency domain, or both. The OFDM signal, which inherently has a high spectral efficiency, is used for carrying broadband data or control information. The spread spectrum signal, which is designed to have a high spread gain for overcoming severe interference, is used for facilitating system functions such as initial random access, channel probing, or short messaging. Methods and techniques are devised to ensure that the mutual interference between the overlapped signals is minimized to have insignificant impact on either signal and that both signals are detectable with expected performance by a receiver.

A wireless device receives configuration parameters of a primary cell and a secondary cell. The secondary cell may be a scheduling cell for the primary cell. The wireless device may receive a DCI based on monitoring search space(s) of the secondary cell. The DCI may comprise a first field and a second field. A first value of the first field may indicate scheduling information. A second value of the second field may indicate that the scheduling information is for scheduling the primary cell. The wireless device may receive or transmit a transport block via the primary cell based on the scheduling information.

Embodiments herein provide a method of estimating channel states of a plurality of user equipments (UEs) in a single instance. The method includes receiving pilot samples from the plurality of UEs. The method includes selecting a predetermined number of tones, wherein the channel associated with each UE across the selected pre-determined number of tones is same. The method includes collecting the received pilot samples from each pilot symbol and stacking the received pilot samples as a vector. Further, the method includes constructing a matrix. The matrix includes known pilot values used by each UE. Furthermore, the method includes estimating channel states of the plurality of UEs by applying a filter on the vector formed from the received pilot samples. The number of channel states to be estimated is reduced by selecting the pre-determined number of tones.

Methods, systems, and devices for wireless communications are described. A receiving device may receive a channel estimation reference signal (CHEST-RS) transmitted over a bandwidth, the CHEST-RS associated with a power amplifier (PA) configuration of a transmitting device. The receiving device may determine a channel estimation measurement associated with the PA configuration based at least in part on the CHEST-RS. The receiving device may receive a non-linear estimation reference signal (NLEST-RS) transmitted over a subset bandwidth of the bandwidth, the NLEST-RS associated with the PA configuration. The receiving device may determine a non-linear estimation measurement associated with the PA configuration based at least in part on the NLEST-RS and the CHEST-RS, the non-linear estimation measurement identifying a non-linear response of the PA configuration. The receiving device may communicate with the transmitting device based at least in part on the channel estimation measurement and the non-linear response of the PA configuration.

The present invention relates to a method by which a base station transmits a reference signal in a wireless communication system supporting a full-dimension antenna, and a device for the same. Particularly, the method comprises the steps of: transmitting, to a terminal, a channel state information-reference signal (CSI-RS) configuration indicating the number of antenna ports for transmitting a full-dimension antenna association reference signal; transmitting, to the terminal, a CSI-RS for at least one first antenna port among whole antenna ports for the full-dimension antenna; and receiving, from the terminal, channel information on all of the antenna ports on the basis of the at least one first antenna port.

Methods, systems, and devices for wireless communication are described. A base station may transmit a phase noise correction reference signal (PC-RS) and a channel state information reference signal (CSI-RS) during a symbol period of a subframe. A user equipment (UE) may identify a first channel information using the PC-RS and the CSI-RS. The UE may transmit a channel information message to the base station that includes the first channel information. The first channel information may include a phase noise corrected channel measurement. The UE may the CSI-RS during the symbol period. Channel and phase noise estimates may be generated using a joint estimation based on the CSI-RS. The CSI-RS may be repeated periodically. In some cases, the UE may additionally or alternatively receive pilot tones that may include PC-RSs. The joint estimation may be further based on the pilot tones.

A handshaking process for time-reversal wireless communication is provided. A first device receives a handshake signal transmitted from a second device through multiple propagation paths, the handshake signal including a preamble and a training sequence, in which the training sequence includes a sequence of symbols known to the first and second devices. A synchronization index is determined based on the preamble, and the training sequence in the handshake signal is identified based on the synchronization index. A channel response signal is determined based on the received training sequence, and a signature waveform that is a time-reversed signal of the channel response signal is generated. A transmission signal is generated based on transmit data and the signature waveform, in which the transmit data are data configured to be transmitted to the second device.