A method for selecting a precoder from a codebook for a channel matrix H and an apparatus. The method includes determining, by a processor, a reference precoder V for the channel H and a phase rotation for V; for all codewords W from a codebook, determining, by the processor, phase rotations for W and phase distances based on differences between phases of elements of V and W; and selecting, by the processor, the codeword W with a minimum phase distance, wherein H has a size of N.sub.R×N.sub.T, N.sub.R is a number of receive antennas, N.sub.T is a number of transmit antennas, V has a size of N.sub.T×L, and L is a number of data layers transmitted simultaneously.

A method and a radio apparatus for signal transmission in a Wireless Local Area Network (WLAN) system are discussed. The method according to an embodiment includes generating first and second very high throughput (VHT) fields including first and second control information, respectively; and transmitting a physical layer protocol data unit (PPDU) including the first and second VHT fields to at least one target station. The first VHT field includes an indicator indicating whether the PPDU is to be transmitted by using a single-user multiple input multiple output (SU-MIMO) scheme or a multi-user multiple input multiple output (MU-MIMO) scheme.

A Virtual Antenna Mapping (VAM) method of a base station and a transmission apparatus equipped with M physical antennas and Q Transceiver Units (TXRUs) are provided. The method includes transmitting Reference Signals (RSs) arranged differently according to respective VAM patterns to a terminal in a transmission mode supporting N logical antennas; receiving a feedback including information regarding a VAM pattern selected as a result of channel measurement with respect to the RSs transmitted according to the VAM pattern from the terminal; and transmitting a signal to the terminal through the M physical antennas by applying the selected VAM pattern, wherein the selected VAM pattern maps N data streams corresponding to the N logical antennas to the M physical antennas through the Q TXRUs.

Methods, apparatus, and systems for wireless communications are described. Example methods, devices, and systems are described that utilize a precoding matrix indicator (PMI) computed based at least in part on first signals received via a first cell and on second signals received via a second cell. Information in a measurement information message may be used as part of computing a PMI. The measurement information message may indicate resources of a first cell and a second cell for use in computing the PMI. A wireless device may receive first signals via the first cell and second signals via the second cell based on information in the measurement information message, and may use these signals to compute the PMI. The computed PMI may be used in communications with a base station. For example, the wireless device may receive a packet beamformed employing the computed PMI.

Apparatus and methods for increasing throughput in wireless systems and networks. In one embodiment, the apparatus and methods provide enhanced performance to 5G millimeter-wave user devices via expanded use of spatial multiplexing layers in various uplink (UL) operating modes, including transform precode and non-transform precode modes. In one implementation, the methods and apparatus described herein can be utilized with respect to a 3GPP 5G NR UE scheduled dynamically in UL transmission. In another implementation, the methods and apparatus described herein can be utilized with respect to the UE scheduled with a Configured Grant (CG) UL transmission.

One example includes a troposcatter communication terminal. The terminal includes an antenna comprising a plurality of communication ports that extend from a rear side of the antenna to a front side of the antenna. The terminal also includes a positioner mechanically coupled to the antenna and being configured to mechanically control positioning of the antenna. The terminal further includes an electronics package mechanically coupled to the rear side of the antenna. The electronics package includes a troposcatter radio communicatively coupled to the antenna via the plurality of communications ports to transmit and receive troposcatter communication signals via the plurality of communication ports at the front side of the antenna.

Methods, apparatus, and systems for wireless communications are disclosed. A first base station may receive one or more message from a second base station. The messages may include downlink beamforming information elements for a downlink cell. Each downlink beamforming information element may be associated with a respective group of resource blocks of a plurality of groups of resource blocks in the downlink cell. The first base station may select a first beamforming codeword for at least one group of resource blocks of the plurality of groups of resource blocks based on the downlink beamforming information associated with the at least one group of resource blocks. The first base station may transmit, to a wireless device, signals on the at least one group of resource blocks employing the first beamforming codeword.

A wireless access node serves a wireless User Equipment (UE) over wireless communication links that use a same time and frequency resource block. In some examples, the wireless communication links comprise Multiple Input Multiple Output (MIMO) layers. In the wireless access node, a baseband unit determines backhaul downlink quality for backhaul downlinks. Based on the backhaul downlink quality, the baseband unit selects a number of the wireless communication links for the wireless UE that will use the same time and frequency resource block. The baseband unit receives user data from the backhaul downlinks and transfers the user data to a radio. The radio wirelessly transfers the user data to the wireless UE over the selected number of the wireless communication links using the same time and frequency resource block.

A network entity comprises a plurality of antenna elements arranged in one or more two dimensional (2D) arrays having one or more columns and rows. The network entity configured to determine at least one set of one or more precoding vectors related to the plurality of antenna elements, wherein each set of precoding vectors is associated with a different Kronecker product tradeoff parameter L≥1; and transmit, at least one set of a plurality of Cell Specific Reference Signals (CRS) to be used to estimate channel state information (CSI) based on the at least one set of precoding vectors and/or at least one Kronecker product tradeoff parameter L.

Apparatuses and methods are disclosed for determining a transport block size (TBS) as a function of various parameters without cyclic dependencies between the parameters and TBS. The disclosed function can determine a TBS in a single pass, and the determined TBS allows the use of code blocks with equal code block size (CBS) in a transport block segmentation process. The determined TBS can provide byte-aligned code block lengths and require no padding bits in a transport block.